P. Yang, Z. Ren, Jian-xin Zhao, A. Nguyen, Yue‐xing Feng, Kai Qi, Kun Wang
The lower Paleozoic strata of Ordos Basin is rich in oil and gas resources. The Lower Paleozoic marine carbonate in the southwestern Ordos Basin is characterized by large thickness and high abundance of organic matter. The source rocks are in dry gas window.However, the tectonic evolution has not been well evaluated. The timing of the earlier tectonic events is a key scientific problem and needs to be addressed timely.In this study, under the constraints of detailed field investigations, microstructure characteristics, in-situ trace element analysis and regional deposition-burial evolution history, the secondary calcite in-situ U-Pb dating is combined with apatite fission-track time-temperature simulation curves of the Lower Paleozoic carbonate strata and its fault facture zone to reveal four tectonic events including the Late Ordovician, Late Triassic, Late Jurassic and end of the Early Cretaceous-Cenozoic.A hydrothermal event occurred at the Late Ordovician 452±13 Ma, which might be linked to the subduction and closure of the Proto-Tethys Ocean during the Caledonian period.A limited Indosinian tectono-thermal event occurred at 214±22 Ma, which might be caused by the regional fault movement.The intense tectonic activities during the Yanshanian and Himalayan periods induced a strong uplift and denudation.The southwestern Ordos Basin experienced multi-stage complex tectonic evolution and the caprock was seriously damaged, leaving rather unfavorable preservation conditions for hydrocarbon.This study conducts a novel tectonic evolution analysis by combining low-temperature thermochronology with in-situ U-Pb dating of fault-related calcite, providing a new way to analyze tectonic evolution and later transformation process at the margin of complex superimposed basins.
{"title":"Tectonic evolution analysis constrained jointly by in-situ calcite U-Pb dating and apatite fission track for southwestern Ordos Basin","authors":"P. Yang, Z. Ren, Jian-xin Zhao, A. Nguyen, Yue‐xing Feng, Kai Qi, Kun Wang","doi":"10.11743/OGG20210516","DOIUrl":"https://doi.org/10.11743/OGG20210516","url":null,"abstract":"The lower Paleozoic strata of Ordos Basin is rich in oil and gas resources. The Lower Paleozoic marine carbonate in the southwestern Ordos Basin is characterized by large thickness and high abundance of organic matter. The source rocks are in dry gas window.However, the tectonic evolution has not been well evaluated. The timing of the earlier tectonic events is a key scientific problem and needs to be addressed timely.In this study, under the constraints of detailed field investigations, microstructure characteristics, in-situ trace element analysis and regional deposition-burial evolution history, the secondary calcite in-situ U-Pb dating is combined with apatite fission-track time-temperature simulation curves of the Lower Paleozoic carbonate strata and its fault facture zone to reveal four tectonic events including the Late Ordovician, Late Triassic, Late Jurassic and end of the Early Cretaceous-Cenozoic.A hydrothermal event occurred at the Late Ordovician 452±13 Ma, which might be linked to the subduction and closure of the Proto-Tethys Ocean during the Caledonian period.A limited Indosinian tectono-thermal event occurred at 214±22 Ma, which might be caused by the regional fault movement.The intense tectonic activities during the Yanshanian and Himalayan periods induced a strong uplift and denudation.The southwestern Ordos Basin experienced multi-stage complex tectonic evolution and the caprock was seriously damaged, leaving rather unfavorable preservation conditions for hydrocarbon.This study conducts a novel tectonic evolution analysis by combining low-temperature thermochronology with in-situ U-Pb dating of fault-related calcite, providing a new way to analyze tectonic evolution and later transformation process at the margin of complex superimposed basins.","PeriodicalId":38384,"journal":{"name":"石油与天然气地质","volume":"327 10","pages":"1189-1201"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41258819","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}
Huang Anping, Anjiang Shen, Feng Liang, Jian-xin Zhao, Luo Xianying, Yue‐xing Feng, T. Cheng
The Laser Ablation (LA)Multi-Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS) technique, co-developed by the CNPC Key Laboratory of Carbonate Reservoir and School of Earth and Environmental Sciences, The University of Queensland, has huge potential to overcome the difficulty in sampling and dating ultra-low concentration U-Pb minerals in ancient marine carbonates that are relatively smaller in diameter in diagenetic fabric, which was untenable by the conventional isotope dilution (ID) methods. The in-situ analysis by LA combined with MC-ICP-MS has been applied to the study on the diagenesis and porosity evolution of the Cambrian Xiaoerbulake reservoir, Tarim Basin.By dating of dolomitic and calcitic cements from filled vugs, matrix pores and fractures in different stages, we suggested that the burial diagenetic history of dolomite reservoir in the Cambrian Xiaoerblake Formation mainly features the filling of primary pores and vugs generated under karstification. The filling of vugs mainly occurred during the early Caledonian, while the filling of matrix pores mainly occurred in the middle Caledonian and Indosinian. Fractures activated during the Caledonian and Indosinian served as the channels for hydrothermal migration, providing the materials to cement the vugs and pores; while the residual vugs, pores and fractures with no filling of dolomite, calcite and siliceous cements were the main reservoir space. The diagenesis and porosity evolution history of dolomite reservoir in the Cambrian Xiaoerbulake Formation, Tarim Basin, was hence established. The understandings mentioned above are highly consistent with the tectonic-burial history and basin thermal history in the study area, which may be effective tools to date the ancient marine carbonate reservoir cements, to reconstruct diagenesis and porosity evolution history, and to evaluate effective pores before hydrocarbon migration in the ancient marine carbonates.
{"title":"Application of laser in-situ U-Pb dating to reconstruct the reservoir porosity evolution in the Cambrian Xiaoerbulake Formation, Tarim Basin 激光铀铅同位素定年技术在塔里木盆地肖尔布拉克组储层孔隙演化研究中的应用","authors":"Huang Anping, Anjiang Shen, Feng Liang, Jian-xin Zhao, Luo Xianying, Yue‐xing Feng, T. Cheng","doi":"10.11743/OGG20200104","DOIUrl":"https://doi.org/10.11743/OGG20200104","url":null,"abstract":"The Laser Ablation (LA)Multi-Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS) technique, co-developed by the CNPC Key Laboratory of Carbonate Reservoir and School of Earth and Environmental Sciences, The University of Queensland, has huge potential to overcome the difficulty in sampling and dating ultra-low concentration U-Pb minerals in ancient marine carbonates that are relatively smaller in diameter in diagenetic fabric, which was untenable by the conventional isotope dilution (ID) methods. The in-situ analysis by LA combined with MC-ICP-MS has been applied to the study on the diagenesis and porosity evolution of the Cambrian Xiaoerbulake reservoir, Tarim Basin.By dating of dolomitic and calcitic cements from filled vugs, matrix pores and fractures in different stages, we suggested that the burial diagenetic history of dolomite reservoir in the Cambrian Xiaoerblake Formation mainly features the filling of primary pores and vugs generated under karstification. The filling of vugs mainly occurred during the early Caledonian, while the filling of matrix pores mainly occurred in the middle Caledonian and Indosinian. Fractures activated during the Caledonian and Indosinian served as the channels for hydrothermal migration, providing the materials to cement the vugs and pores; while the residual vugs, pores and fractures with no filling of dolomite, calcite and siliceous cements were the main reservoir space. The diagenesis and porosity evolution history of dolomite reservoir in the Cambrian Xiaoerbulake Formation, Tarim Basin, was hence established. The understandings mentioned above are highly consistent with the tectonic-burial history and basin thermal history in the study area, which may be effective tools to date the ancient marine carbonate reservoir cements, to reconstruct diagenesis and porosity evolution history, and to evaluate effective pores before hydrocarbon migration in the ancient marine carbonates.","PeriodicalId":38384,"journal":{"name":"石油与天然气地质","volume":"41 1","pages":"37-49"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41587945","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}
S. Yuan, K. Chen, B. Hardage, Zhiqiang Feng, S. Wei
In recent years,the development of shale oil and gas shows that shale heterogeneity and lateral orientation have relatively great impacts on single well shale gas production,recovery factor and the economy of shale gas exploitation,and natural micro-fracture is the main factor resulting in shale heterogeneity. Accordingly,to carry out research on the natural micro-fractures and prediction of sweet spots within shale has become an inevitable choice for successful emplacement of high-yielding wells and improving economic benefits of shale gas exploitation. Based on the high resolution 3C /3D seismic data in Marcellus shale play within Appalachian Basin,North America,natural micro-fracture zone of Marcellus shale was predicted by means of fast and slow converted shear wave( PSV-1 / PSV-2) integrated interpretation,then the open / closed fractures and gas-bearing property of extensional micro-fractures were separately identified and detected by utilizing combined attribute parameters like joint inversion density,velocity ratio of compressional and converted wave( vP/ vS) extracted from joint inversion of compressional wave and converted shear wave( PP-PS). In addition,drilling data were used to verify the sweet spots predicted by geophysical method in Marcellus shale. Joint inversion technique( PP-PS) has outstanding advantages in natural extensional micro-fractures identification and gas-bearing detection,which can effectively reduce the drilling risk.
{"title":"Application of joint PP and PS inversion to the exploration of shale-gas reservoirs","authors":"S. Yuan, K. Chen, B. Hardage, Zhiqiang Feng, S. Wei","doi":"10.11743/OGG20150122","DOIUrl":"https://doi.org/10.11743/OGG20150122","url":null,"abstract":"In recent years,the development of shale oil and gas shows that shale heterogeneity and lateral orientation have relatively great impacts on single well shale gas production,recovery factor and the economy of shale gas exploitation,and natural micro-fracture is the main factor resulting in shale heterogeneity. Accordingly,to carry out research on the natural micro-fractures and prediction of sweet spots within shale has become an inevitable choice for successful emplacement of high-yielding wells and improving economic benefits of shale gas exploitation. Based on the high resolution 3C /3D seismic data in Marcellus shale play within Appalachian Basin,North America,natural micro-fracture zone of Marcellus shale was predicted by means of fast and slow converted shear wave( PSV-1 / PSV-2) integrated interpretation,then the open / closed fractures and gas-bearing property of extensional micro-fractures were separately identified and detected by utilizing combined attribute parameters like joint inversion density,velocity ratio of compressional and converted wave( vP/ vS) extracted from joint inversion of compressional wave and converted shear wave( PP-PS). In addition,drilling data were used to verify the sweet spots predicted by geophysical method in Marcellus shale. Joint inversion technique( PP-PS) has outstanding advantages in natural extensional micro-fractures identification and gas-bearing detection,which can effectively reduce the drilling risk.","PeriodicalId":38384,"journal":{"name":"石油与天然气地质","volume":"36 1","pages":"168-174"},"PeriodicalIF":0.0,"publicationDate":"2015-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64537889","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}
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