M. H. Anders, J. Craddock, D. Malone, J. F. Magloughlin
We would like to begin by paying tribute to Ed Beutner who passed away in 2008. Ed made significant contributions to the continuing debate over one of the most enigmatic features on the surface of the Earth, the Heart Mountain slide block. Ed will be greatly missed and we wish that he were here to respond to our discussion of his most recent paper—we are certain his comments would have been insightful and of interest to all working on the Heart Mountain problem. In lieu of having Ed's response, we are confident that Tom Hauge will provide a vigorous defense picking up the mantle so aptly held by Ed. We have a number of concerns about the slow/fast model presented by Beutner and Hauge (2009). In our view, many of their arguments supporting slow or incremental movement of the Heart Mountain slide block are not supported by the evidence. In addition, we wish to correct certain erroneous statements and omissions about previous work. In reference to the “phreatomagmatic-hydraulic” model of Straw and Schmidt (1981a, b), Beutner and Hauge (2009, p. 159) state that “… Aharonov and Anders (2006) provided a refined version of the last model.” The Aharonov and Anders model is not a “refined version” of the Straw and Schmidt model as presented in their 1981a and 1981b abstracts. Straw and Schmidt (1981a) wrote: “eruptive centers exerted explosive pressure on water in the regional fracture system” and that the groundwater “exceeded normal lithostatic stress and ‘lift’ the upper plate.” Aharonov and Anders (2006) proposed that the intrusion of dikes heated trapped ground water and reduced pore space via the Skempton effect (Skempton, 1954), thus causing elevated basal pore pressure, enabling sliding of the upper plate along the extremely low 2° gradient. These two models are only …
首先，我们要向2008年去世的埃德·博特纳(Ed Beutner)致敬。埃德对地球表面最神秘的特征之一——心脏山滑坡块——的持续争论做出了重大贡献。我们将非常想念Ed，我们希望他能在这里回应我们对他最近论文的讨论。我们确信他的评论将是有见地的，并且会引起所有研究心脏山问题的人的兴趣。代替Ed的回应，我们有信心Tom Hauge将提供有力的辩护，拿起Ed所恰当地持有的地幔。我们对Beutner和Hauge(2009)提出的慢/快模型有很多担忧。在我们看来，他们许多支持心脏山滑块缓慢或增量运动的论点都没有证据支持。此外，我们希望纠正一些关于以前工作的错误陈述和遗漏。Beutner和Hauge (2009, p. 159)在提到Straw和Schmidt (1981a, b)的“呼吸-水力”模型时指出，“……Aharonov和Anders(2006)提供了最后一个模型的改进版本。”Aharonov和Anders模型并不是Straw和Schmidt模型在他们1981a和1981b摘要中提出的“精炼版”。Straw和Schmidt (1981a)写道:“喷发中心对区域断裂系统中的水施加了爆炸性压力”，地下水“超过了正常的静岩应力，‘抬升’了上部板块”。Aharonov和Anders(2006)提出，岩堤的侵入通过Skempton效应加热了被困地下水，缩小了孔隙空间(Skempton, 1954)，从而导致基底孔隙压力升高，使上部板块沿极低的2°梯度滑动。这两种型号只有……
{"title":"Heart Mountain and South Fork fault systems: Architecture and evolution of the collapse of an Eocene volcanic system, northwest Wyoming: COMMENT","authors":"M. H. Anders, J. Craddock, D. Malone, J. F. Magloughlin","doi":"10.2113/GSROCKY.46.1.71","DOIUrl":"https://doi.org/10.2113/GSROCKY.46.1.71","url":null,"abstract":"We would like to begin by paying tribute to Ed Beutner who passed away in 2008. Ed made significant contributions to the continuing debate over one of the most enigmatic features on the surface of the Earth, the Heart Mountain slide block. Ed will be greatly missed and we wish that he were here to respond to our discussion of his most recent paper—we are certain his comments would have been insightful and of interest to all working on the Heart Mountain problem. In lieu of having Ed's response, we are confident that Tom Hauge will provide a vigorous defense picking up the mantle so aptly held by Ed. We have a number of concerns about the slow/fast model presented by Beutner and Hauge (2009). In our view, many of their arguments supporting slow or incremental movement of the Heart Mountain slide block are not supported by the evidence. In addition, we wish to correct certain erroneous statements and omissions about previous work.\u0000\u0000In reference to the “phreatomagmatic-hydraulic” model of Straw and Schmidt (1981a, b), Beutner and Hauge (2009, p. 159) state that “… Aharonov and Anders (2006) provided a refined version of the last model.” The Aharonov and Anders model is not a “refined version” of the Straw and Schmidt model as presented in their 1981a and 1981b abstracts. Straw and Schmidt (1981a) wrote: “eruptive centers exerted explosive pressure on water in the regional fracture system” and that the groundwater “exceeded normal lithostatic stress and ‘lift’ the upper plate.” Aharonov and Anders (2006) proposed that the intrusion of dikes heated trapped ground water and reduced pore space via the Skempton effect (Skempton, 1954), thus causing elevated basal pore pressure, enabling sliding of the upper plate along the extremely low 2° gradient. These two models are only …","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"46 1","pages":"71-75"},"PeriodicalIF":0.0,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.46.1.71","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68311141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-21DOI: 10.2113/GSROCKY.45.2.133
G. Thyne, M. Tomasso, S. Bywater‐Reyes, D. Budd, Brian M. Reyes
Porosity and permeability data for the Mississippian Madison Group in southwestern Wyoming were compiled and evaluated to relate these properties to stratigraphic facies in the Madison Group. The study was performed to provide baseline data for a geologic model required to sequester carbon in the study area. Public domain geological and petrophysical data provided the basis for the evaluation. Using the available database of wire-line logs and core from wells that penetrate the Madison Group, we place the wells within the regional structural and sequence-stratigraphic framework and detail porosity-permeability relationships. The highest porosity and permeability in the study area is present in the lower portion of the formation in dolomitic packstone-to grainstone-dominated facies near the top of the transgressive systems tract. Wire-line logs were used to calculate porosity values that correlate well with the more limited core-based data. The porosity in the Madison Group has a tri-modal distribution with porosity related to depositional facies. The first group is characterized by low porosity ( 12 percent) with a strong log permeability to porosity covariance. While lateral variations in porosity related to depositional facies can be traced over tens of kilometers, natural fractures appear to be a significant control on permeability in the lower porosity portions of the Madison.
{"title":"Characterization of porosity and permeability for CO2 sequestration models in the Mississippian Madison Group, Moxa Arch–LaBarge Platform, southwestern Wyoming","authors":"G. Thyne, M. Tomasso, S. Bywater‐Reyes, D. Budd, Brian M. Reyes","doi":"10.2113/GSROCKY.45.2.133","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.133","url":null,"abstract":"Porosity and permeability data for the Mississippian Madison Group in southwestern Wyoming were compiled and evaluated to relate these properties to stratigraphic facies in the Madison Group. The study was performed to provide baseline data for a geologic model required to sequester carbon in the study area. Public domain geological and petrophysical data provided the basis for the evaluation. Using the available database of wire-line logs and core from wells that penetrate the Madison Group, we place the wells within the regional structural and sequence-stratigraphic framework and detail porosity-permeability relationships. The highest porosity and permeability in the study area is present in the lower portion of the formation in dolomitic packstone-to grainstone-dominated facies near the top of the transgressive systems tract. Wire-line logs were used to calculate porosity values that correlate well with the more limited core-based data. The porosity in the Madison Group has a tri-modal distribution with porosity related to depositional facies. The first group is characterized by low porosity ( 12 percent) with a strong log permeability to porosity covariance. While lateral variations in porosity related to depositional facies can be traced over tens of kilometers, natural fractures appear to be a significant control on permeability in the lower porosity portions of the Madison.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"133-150"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Coal supplies nearly 50 percent of electricity generation in the United States and 25 percent of the global energy supply; Wyoming produces approximately 40 percent of the coal consumed in the United States. It is likely that near-term energy strategies will include coal and other fossil energy sources in the fuel mix, therefore mitigating carbon dioxide emissions through geologic carbon capture and sequestration (CCS) is crucial. Here we discuss the current state of CCS technology across the globe and its future potential for development. We also outline the current regulatory structure for CCS in the United States, specifically Wyoming, and we introduce the study undertaken by University of Wyoming researchers and their collaborators to characterize Paleozoic deep saline aquifers on the Moxa Arch in southwestern Wyoming for long-term geologic carbon storage. The research presented in this special issue of Rocky Mountain Geology and future research that builds on these findings, such as the site characterization project underway on the Rock Springs Uplift in Wyoming, will be important steps to advance successful CCS technologies at a rate and scale that can make a meaningful impact on greenhouse gas emissions and to construct commercial geologic sequestration projects in the Rocky Mountain West.
{"title":"Geologic carbon sequestration in Wyoming: prospects and progress","authors":"C. Frost, Anne C. Jakle","doi":"10.2113/GSROCKY.45.2.83","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.83","url":null,"abstract":"Coal supplies nearly 50 percent of electricity generation in the United States and 25 percent of the global energy supply; Wyoming produces approximately 40 percent of the coal consumed in the United States. It is likely that near-term energy strategies will include coal and other fossil energy sources in the fuel mix, therefore mitigating carbon dioxide emissions through geologic carbon capture and sequestration (CCS) is crucial. Here we discuss the current state of CCS technology across the globe and its future potential for development. We also outline the current regulatory structure for CCS in the United States, specifically Wyoming, and we introduce the study undertaken by University of Wyoming researchers and their collaborators to characterize Paleozoic deep saline aquifers on the Moxa Arch in southwestern Wyoming for long-term geologic carbon storage. The research presented in this special issue of Rocky Mountain Geology and future research that builds on these findings, such as the site characterization project underway on the Rock Springs Uplift in Wyoming, will be important steps to advance successful CCS technologies at a rate and scale that can make a meaningful impact on greenhouse gas emissions and to construct commercial geologic sequestration projects in the Rocky Mountain West.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"83-91"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.83","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-21DOI: 10.2113/GSROCKY.45.2.181
Milton E. Geiger, R. Coupal, D. Mcleod
The implementation of federal climate change legislation would alter the relative price advantages of fossil fuels produced in Wyoming and resultant tax revenue. Our policy model demonstrates changes in the prices and quantities produced of coal, natural gas, oil, and wind energy—including electrical generation and multiplier effects—resulting from federal action. With carbon dioxide equivalent (CO 2 -e) prices ranging from $0–$70/ton, Wyoming tax revenue would increase due to tremendous growth in price and production of natural gas, which substitutes for declines in coal revenue. Wind energy contributions to tax revenue would remain limited due to a low effective tax rate relative to fossil fuels.
{"title":"Potential impacts of federal regulation of greenhouse gas emissions on Wyoming's energy-derived tax revenue","authors":"Milton E. Geiger, R. Coupal, D. Mcleod","doi":"10.2113/GSROCKY.45.2.181","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.181","url":null,"abstract":"The implementation of federal climate change legislation would alter the relative price advantages of fossil fuels produced in Wyoming and resultant tax revenue. Our policy model demonstrates changes in the prices and quantities produced of coal, natural gas, oil, and wind energy—including electrical generation and multiplier effects—resulting from federal action. With carbon dioxide equivalent (CO 2 -e) prices ranging from $0–$70/ton, Wyoming tax revenue would increase due to tremendous growth in price and production of natural gas, which substitutes for declines in coal revenue. Wind energy contributions to tax revenue would remain limited due to a low effective tax rate relative to fossil fuels.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"181-191"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Smith, Shikha Sharma, Teal B. Wyckoff, C. Frost
Geologic sequestration of anthropogenic carbon dioxide (CO 2 ) will be a necessary part of a carbon management strategy for reducing atmospheric CO 2 emissions so long as fossil fuels are a significant part of the energy mix. Proposed federal and state regulations for underground injection of CO 2 require that underground sources of drinking water be protected. Accordingly, proposed federal regulations require analysis of the suitability of different receiving formations for geologic sequestration. This study compiles all available water quality data for four potential CO 2 receiving formations in the Greater Green River Basin of southwestern Wyoming. The Greater Green River Basin encompasses two large geologic structures, the Moxa Arch and Rock Springs Uplift, which potentially are capable of storing commercial quantities of CO 2 in a number of formations, including the Nugget Sandstone, Tensleep/Weber Sandstone, Madison li mestone, and Bighorn Dolomite. The data suggest that except along the basin margins, the Tensleep/Weber, Madison, and Bighorn Formations are suitable targets under proposed federal and state geologic sequestration regulations. However, low total dissolved solids in Nugget Sandstone groundwater in parts of the Rock Springs Uplift suggest the potential for local, fracture-assisted recharge in this area. For this reason the Nugget Sandstone is less suitable than the deeper formations for CO 2 storage in the Rock Springs Uplift.
只要化石燃料是能源结构的重要组成部分，地质封存人为二氧化碳将是减少大气二氧化碳排放的碳管理战略的必要组成部分。联邦和州关于地下注入二氧化碳的拟议法规要求保护地下饮用水源。因此，拟议的联邦法规要求分析不同接收地层是否适合地质封存。本研究汇编了怀俄明州西南部大绿河流域四个潜在的二氧化碳接收地层的所有可用水质数据。大绿河盆地包括两个大型地质构造，Moxa Arch和Rock Springs隆起，它们有可能在许多地层中储存商业数量的二氧化碳，包括Nugget砂岩、Tensleep/Weber砂岩、Madison li mestone和bighhorn白云岩。数据表明，除了沿盆地边缘，Tensleep/Weber、Madison和Bighorn地层都是联邦和州地质封存规定下的合适目标。然而，岩泉隆起部分地区的nuget砂岩地下水中总溶解固体含量较低，表明该地区可能存在局部裂缝辅助补给。因此，与岩泉隆起的深层地层相比，金块砂岩不太适合储存二氧化碳。
{"title":"Baseline geochemical characterization of potential receiving reservoirs for carbon dioxide in the Greater Green River Basin, Wyoming","authors":"M. Smith, Shikha Sharma, Teal B. Wyckoff, C. Frost","doi":"10.2113/GSROCKY.45.2.93","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.93","url":null,"abstract":"Geologic sequestration of anthropogenic carbon dioxide (CO 2 ) will be a necessary part of a carbon management strategy for reducing atmospheric CO 2 emissions so long as fossil fuels are a significant part of the energy mix. Proposed federal and state regulations for underground injection of CO 2 require that underground sources of drinking water be protected. Accordingly, proposed federal regulations require analysis of the suitability of different receiving formations for geologic sequestration. This study compiles all available water quality data for four potential CO 2 receiving formations in the Greater Green River Basin of southwestern Wyoming. The Greater Green River Basin encompasses two large geologic structures, the Moxa Arch and Rock Springs Uplift, which potentially are capable of storing commercial quantities of CO 2 in a number of formations, including the Nugget Sandstone, Tensleep/Weber Sandstone, Madison li mestone, and Bighorn Dolomite. The data suggest that except along the basin margins, the Tensleep/Weber, Madison, and Bighorn Formations are suitable targets under proposed federal and state geologic sequestration regulations. However, low total dissolved solids in Nugget Sandstone groundwater in parts of the Rock Springs Uplift suggest the potential for local, fracture-assisted recharge in this area. For this reason the Nugget Sandstone is less suitable than the deeper formations for CO 2 storage in the Rock Springs Uplift.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"93-111"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.93","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-01DOI: 10.2113/GSROCKY.45.2.163
J. Hamerlinck, Teal B. Wyckoff, J. Oakleaf, P. Polzer
This paper describes the design and development of a conceptual framework for creating and implementing a cyberinfrastructure model to support interdisciplinary science associated with geologic carbon sequestration at the University of Wyoming. “Cyberinfrastructure” is a term increasingly used within the scientific community to represent information infrastructure networks connecting technology, data, and people to support research activities and the dissemination of its results. In this study, a cyberinfrastructure was designed for a multi-team, multi-task project case study centered on carbon sequestration research in the Moxa Arch, Wyoming. The design was based on a needs assessment conducted to identify information technology practices and requirements for each science team, resulting in a prototype carbon capture and storage knowledgebase workflow model. Major components of the workflow model include social networking functionality and geographic information system–based data management and visualization. The long-term goal of the effort is to build a cyberinfrastructure that fosters and enhances collaboration across research involved with geologic characterization, reservoir modeling, and long-term monitoring of geologic sequestration activities in Wyoming and throughout the Rocky Mountain Region.
{"title":"Cyberinfrastructure for collaborative geologic carbon sequestration research a conceptual model","authors":"J. Hamerlinck, Teal B. Wyckoff, J. Oakleaf, P. Polzer","doi":"10.2113/GSROCKY.45.2.163","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.163","url":null,"abstract":"This paper describes the design and development of a conceptual framework for creating and implementing a cyberinfrastructure model to support interdisciplinary science associated with geologic carbon sequestration at the University of Wyoming. “Cyberinfrastructure” is a term increasingly used within the scientific community to represent information infrastructure networks connecting technology, data, and people to support research activities and the dissemination of its results. In this study, a cyberinfrastructure was designed for a multi-team, multi-task project case study centered on carbon sequestration research in the Moxa Arch, Wyoming. The design was based on a needs assessment conducted to identify information technology practices and requirements for each science team, resulting in a prototype carbon capture and storage knowledgebase workflow model. Major components of the workflow model include social networking functionality and geographic information system–based data management and visualization. The long-term goal of the effort is to build a cyberinfrastructure that fosters and enhances collaboration across research involved with geologic characterization, reservoir modeling, and long-term monitoring of geologic sequestration activities in Wyoming and throughout the Rocky Mountain Region.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"163-180"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-01DOI: 10.2113/GSROCKY.45.2.151
C. Douglas, F. Furtado, V. Ginting, M. Mendes, F. Pereira, M. Piri
We report on the development of a multiscale parallel simulator for porous media flow problems. We combine state-of-the-art numerical techniques in a new object-oriented, high-performance simulation tool. The new multiscale parallel software will adapt itself to the type and number of available processing cores. The combination of: physically based operator splitting for multiscale time discretization of nonlinear systems of partial differential equations arising in multiphase flows in porous media, domain decomposition for the parallel solution of elliptic and parabolic problems, and semi-discrete central finite volume schemes for hyperbolic systems allows us to produce new very accurate simulations of multiphase flow in porous media problems that are of interest in many areas of science and technology, such as petroleum reservoir and environmental engineering. The new simulation code may aid the assessment and monitoring of CO 2 sequestration projects by providing accurate predictions of the migration and trapping of injected CO 2 plumes.
{"title":"On the development of a high-performance tool for the simulation of CO2 injection into deep saline aquifers","authors":"C. Douglas, F. Furtado, V. Ginting, M. Mendes, F. Pereira, M. Piri","doi":"10.2113/GSROCKY.45.2.151","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.151","url":null,"abstract":"We report on the development of a multiscale parallel simulator for porous media flow problems. We combine state-of-the-art numerical techniques in a new object-oriented, high-performance simulation tool. The new multiscale parallel software will adapt itself to the type and number of available processing cores. The combination of: physically based operator splitting for multiscale time discretization of nonlinear systems of partial differential equations arising in multiphase flows in porous media, domain decomposition for the parallel solution of elliptic and parabolic problems, and semi-discrete central finite volume schemes for hyperbolic systems allows us to produce new very accurate simulations of multiphase flow in porous media problems that are of interest in many areas of science and technology, such as petroleum reservoir and environmental engineering. The new simulation code may aid the assessment and monitoring of CO 2 sequestration projects by providing accurate predictions of the migration and trapping of injected CO 2 plumes.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"151-161"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-09-01DOI: 10.2113/GSROCKY.45.2.113
R. Lynds, E. Campbell-Stone, T. P. Becker, C. Frost
The Moxa Arch in the Greater Green River Basin, southwestern Wyoming, hosts two potential reservoirs for CO2 sequestration. The Bighorn Dolomite and Madison Limestone are interpreted to be independent reservoirs based on differing CO2 compositions and production histories; the two reservoirs are separated by Devonian carbonates, siliciclastic rocks, and evaporites. On the Moxa Arch, the Bighorn ranges in thickness from 67 to 120 m with porosities from 3 to 15 percent. The massive buff-colored Steamboat Point Member comprises the bulk of the subsurface Bighorn in southwest Wyoming. Mottled dolostone (light-colored patches with higher porosity and dark-colored patches with lower porosity) is very common and is presumably the result of preferential early dolomitization of bioturbation. Core study suggests that this factor affects gas saturation and storage in this extensive reservoir. The Lower Member of the Jefferson Formation is the most probable seal within the Devonian stratigraphy. Strata of this member are interpreted to have been deposited in a shallow basin semi-isolated from the deeper marine environment to the west. 87Sr/86Sr isotopic analyses of anhydrite sampled from Moxa Arch well cuttings support the interpretation of a depositional environment exposed to a mixture of seawater and freshwater. High-frequency relative sea level fluctuations superimposed on a gently sloping shelf produced alternating layers of marine carbonates, peritidal siliciclastic rocks, and evaporites. The evaporites are interpreted to seal CO2 in the Bighorn Dolomite from the overlying Madison Limestone. The Lower Paleozoic strata on the Moxa Arch provide an effective trap-reservoir-seal combination for naturally occurring CO2 with potential applications to future studies at analogous locations in the central Rocky Mountain Region.
{"title":"Stratigraphic evaluation of reservoir and seal in a natural CO2 field Lower Paleozoic, Moxa Arch, southwest Wyoming","authors":"R. Lynds, E. Campbell-Stone, T. P. Becker, C. Frost","doi":"10.2113/GSROCKY.45.2.113","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.113","url":null,"abstract":"The Moxa Arch in the Greater Green River Basin, southwestern Wyoming, hosts two potential reservoirs for CO2 sequestration. The Bighorn Dolomite and Madison Limestone are interpreted to be independent reservoirs based on differing CO2 compositions and production histories; the two reservoirs are separated by Devonian carbonates, siliciclastic rocks, and evaporites.\u0000\u0000On the Moxa Arch, the Bighorn ranges in thickness from 67 to 120 m with porosities from 3 to 15 percent. The massive buff-colored Steamboat Point Member comprises the bulk of the subsurface Bighorn in southwest Wyoming. Mottled dolostone (light-colored patches with higher porosity and dark-colored patches with lower porosity) is very common and is presumably the result of preferential early dolomitization of bioturbation. Core study suggests that this factor affects gas saturation and storage in this extensive reservoir.\u0000\u0000The Lower Member of the Jefferson Formation is the most probable seal within the Devonian stratigraphy. Strata of this member are interpreted to have been deposited in a shallow basin semi-isolated from the deeper marine environment to the west. 87Sr/86Sr isotopic analyses of anhydrite sampled from Moxa Arch well cuttings support the interpretation of a depositional environment exposed to a mixture of seawater and freshwater. High-frequency relative sea level fluctuations superimposed on a gently sloping shelf produced alternating layers of marine carbonates, peritidal siliciclastic rocks, and evaporites. The evaporites are interpreted to seal CO2 in the Bighorn Dolomite from the overlying Madison Limestone. The Lower Paleozoic strata on the Moxa Arch provide an effective trap-reservoir-seal combination for naturally occurring CO2 with potential applications to future studies at analogous locations in the central Rocky Mountain Region.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"113-132"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68309997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report new U-Pb zircon ages for four previously undated Proterozoic granitoid intrusions exposed in the southern Sawatch Range, central Colorado. Coarse-grained to K-feldspar megacrystic granite (Henry Mountain granite) exposed along Taylor Canyon 20 km north of Gunnison, Colorado, crystallized at 1697 ± 7 Ma. It cuts across high-temperature deformational fabrics in metavolcanic and metasedimentary country rocks, thus bracketing at least one Paleoproterozoic tectonic event locally. This granite also contains a well-developed northeaststriking, subvertical foliation that postdates emplacement. The three other intrusions all yielded Mesoproterozoic ages. The Monarch Pass pluton, comprising coarse- to medium-grained granodiorite exposed 50 km east of Gunnison, crystallized at 1447 ± 9 Ma. It cuts across well-developed fabrics in metavolcanic host rocks and contains a widespread biotite foliation. Coarse-grained to K-feldspar megacrystic granite (Horsethief granite) exposed 5–10 km northwest of Taylor Park Reservoir was emplaced at 1437 ± 5 Ma, and it is locally deformed. Fine-grained, muscovite-biotite granite (Taylor River granite) that cuts across the southwestern part of the Henry Mountain pluton crystallized at 1428 ± 23 Ma. A subvertical, northeast-striking biotite foliation cuts across the contact between these two intrusions, suggesting that northwest-directed subhorizontal shortening occurred locally during the Mesoproterozoic. These ages provide new opportunities to constrain the age of tectonism in central Colorado and to further understand the Proterozoic tectonic evolution of southern Laurentia.
{"title":"U-Pb geochronology of Proterozoic granites in the Sawatch Range, central Colorado, U.S.A.","authors":"James V. Jones, S. Rogers, J. Connelly","doi":"10.2113/GSROCKY.45.1.1","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.1.1","url":null,"abstract":"We report new U-Pb zircon ages for four previously undated Proterozoic granitoid intrusions exposed in the southern Sawatch Range, central Colorado. Coarse-grained to K-feldspar megacrystic granite (Henry Mountain granite) exposed along Taylor Canyon 20 km north of Gunnison, Colorado, crystallized at 1697 ± 7 Ma. It cuts across high-temperature deformational fabrics in metavolcanic and metasedimentary country rocks, thus bracketing at least one Paleoproterozoic tectonic event locally. This granite also contains a well-developed northeaststriking, subvertical foliation that postdates emplacement. The three other intrusions all yielded Mesoproterozoic ages. The Monarch Pass pluton, comprising coarse- to medium-grained granodiorite exposed 50 km east of Gunnison, crystallized at 1447 ± 9 Ma. It cuts across well-developed fabrics in metavolcanic host rocks and contains a widespread biotite foliation. Coarse-grained to K-feldspar megacrystic granite (Horsethief granite) exposed 5–10 km northwest of Taylor Park Reservoir was emplaced at 1437 ± 5 Ma, and it is locally deformed. Fine-grained, muscovite-biotite granite (Taylor River granite) that cuts across the southwestern part of the Henry Mountain pluton crystallized at 1428 ± 23 Ma. A subvertical, northeast-striking biotite foliation cuts across the contact between these two intrusions, suggesting that northwest-directed subhorizontal shortening occurred locally during the Mesoproterozoic. These ages provide new opportunities to constrain the age of tectonism in central Colorado and to further understand the Proterozoic tectonic evolution of southern Laurentia.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2010-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.1.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stenomylus tubutamensis was reported as the smallest species of the genus by Ferrusquia-Villafranca (1990). Eight diagnostic characters, or groups of characters were listed as autapomorphies for S. tubutamensis . Three additional characters were shared with other species of Stenomylus . A re-analysis of S. tubutamensis was made by comparing its diagnostic characters to the same characters based on larger samples of other species of Stenomylus . The re-analysis shows that S. tubutamensis possesses one autapomorphy based on the original diagnostic characters. Nor does the S. tubutamensis possess a unique combination of characters. The study shows that many characters, especially raw dental metric characters, of the Stenomylinae are quite variable in their expression and can only be assessed by examination of means and ranges of variation based on large samples. The diagnosis of S. tubutamensis is revised. Relative to the other species of Stenomylus , S. tubutamensis is now diagnosed by the possession of the smallest upper canine, smallest P1, shortest average p1–p2 diastema, shortest average C–P1 diastema, shortest average p2–p3 diastema, and narrow, slit-like fossettids on the lower molars. The abandonment of the subgenera Stenomylus and Pegomylus is proposed.
{"title":"Is Stenomylus tubutamensis Ferrusquia-Villafranca 1990 a valid species?","authors":"Michael Cassiliano","doi":"10.2113/GSROCKY.45.1.35","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.1.35","url":null,"abstract":"Stenomylus tubutamensis was reported as the smallest species of the genus by Ferrusquia-Villafranca (1990). Eight diagnostic characters, or groups of characters were listed as autapomorphies for S. tubutamensis . Three additional characters were shared with other species of Stenomylus . A re-analysis of S. tubutamensis was made by comparing its diagnostic characters to the same characters based on larger samples of other species of Stenomylus . The re-analysis shows that S. tubutamensis possesses one autapomorphy based on the original diagnostic characters. Nor does the S. tubutamensis possess a unique combination of characters. The study shows that many characters, especially raw dental metric characters, of the Stenomylinae are quite variable in their expression and can only be assessed by examination of means and ranges of variation based on large samples. The diagnosis of S. tubutamensis is revised. Relative to the other species of Stenomylus , S. tubutamensis is now diagnosed by the possession of the smallest upper canine, smallest P1, shortest average p1–p2 diastema, shortest average C–P1 diastema, shortest average p2–p3 diastema, and narrow, slit-like fossettids on the lower molars. The abandonment of the subgenera Stenomylus and Pegomylus is proposed.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"16 1","pages":"35-57"},"PeriodicalIF":0.0,"publicationDate":"2010-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.1.35","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68309782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：