Pub Date : 2019-12-01DOI: 10.1080/22020586.2019.12073044
M. Sharlov, I. Buddo, Alexander Pisarnitskiy, N. Misurkeeva, I. Shelohov
Summary The transient electromagnetic method (TEM) survey was carried out within one of the private house area to allocate the fresh water reservoirs in Greece. There are two challenges that make the problem complex. The first is noisy settings for geophysical survey: populated area with power lines, pipes, houses etc. The second challenge is uncertainties with water-bearing reservoirs. According to geological settings and water-bearing reservoirs location, geophysical survey had to maintain penetration depth up to 250-300 m. For this task DC (direct current) methods are not applicable whereas induction electromagnetic sounding like Transient electromagnetic method (TEM) in the near field zone can show superior results. Therefore TEM survey was carried out. To ensure the high quality of TEM data the special algorithms of electromagnetic noise attenuation were applied. From TEM results it was found, that at a depth of about 180–280 m in the southeastern part of the study area, one can expect the presence of fresh water, and the resistance values are 80 Ω·m.
{"title":"Shallow transient electromagnetic method application for groundwater exploration: case study from Greece","authors":"M. Sharlov, I. Buddo, Alexander Pisarnitskiy, N. Misurkeeva, I. Shelohov","doi":"10.1080/22020586.2019.12073044","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073044","url":null,"abstract":"Summary The transient electromagnetic method (TEM) survey was carried out within one of the private house area to allocate the fresh water reservoirs in Greece. There are two challenges that make the problem complex. The first is noisy settings for geophysical survey: populated area with power lines, pipes, houses etc. The second challenge is uncertainties with water-bearing reservoirs. According to geological settings and water-bearing reservoirs location, geophysical survey had to maintain penetration depth up to 250-300 m. For this task DC (direct current) methods are not applicable whereas induction electromagnetic sounding like Transient electromagnetic method (TEM) in the near field zone can show superior results. Therefore TEM survey was carried out. To ensure the high quality of TEM data the special algorithms of electromagnetic noise attenuation were applied. From TEM results it was found, that at a depth of about 180–280 m in the southeastern part of the study area, one can expect the presence of fresh water, and the resistance values are 80 Ω·m.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"68 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81271772","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073168
M. Hutchens
Summary The Geological Survey of South Australia (GSSA) designed the Gawler Craton Airborne Survey (GCAS) to provide high resolution magnetic, gamma-ray and elevation data covering the northern portion of the Gawler Craton. In total, 1.66 million line km were planned over an area of 295,000 km2, covering approximately 30% of the state of South Australia. The survey design of 200 m spaced lines at a ground clearance of 60 m can be compared with the design of existing regional surveys which generally employed 400 m line spacing and a ground clearance of 80 m. The new survey design results in ~2 x the data coverage and ~25% closer to the ground when compared to previous standards for regional surveys in South Australia. Due to the enormous scale of the survey, the data were acquired using four contractors who employed ten systems to fly the sixteen blocks. To standardise the data from the multitude of systems, Geoscience Australia (GA) employed a comprehensive set of technical specifications. As part of these specifications the contractors were required to fly each of the ten systems over a series of test lines termed the “Whyalla Test Lines” (Whyalla). The final GCAS data provide truly impressive high resolution regional scale products. These will allow more detailed geological interpretation of the prospective Gawler Craton. A laser altimeter was added to the list of required survey equipment. Deficiencies in the technical specifications relating to laser altimeters were identified. Standards and procedures specific to laser characteristics will need to be considered on future surveys. Analyses show that weaknesses in current standards and procedures are still evident. The weaknesses identified allow room for improvements to be made for future surveys. Gamma-ray processing results raised the most serious concerns, with repeatability not achieved. Changes to standard procedures may need to be considered.
{"title":"Learnings from the Gawler Craton airborne survey quality control","authors":"M. Hutchens","doi":"10.1080/22020586.2019.12073168","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073168","url":null,"abstract":"Summary The Geological Survey of South Australia (GSSA) designed the Gawler Craton Airborne Survey (GCAS) to provide high resolution magnetic, gamma-ray and elevation data covering the northern portion of the Gawler Craton. In total, 1.66 million line km were planned over an area of 295,000 km2, covering approximately 30% of the state of South Australia. The survey design of 200 m spaced lines at a ground clearance of 60 m can be compared with the design of existing regional surveys which generally employed 400 m line spacing and a ground clearance of 80 m. The new survey design results in ~2 x the data coverage and ~25% closer to the ground when compared to previous standards for regional surveys in South Australia. Due to the enormous scale of the survey, the data were acquired using four contractors who employed ten systems to fly the sixteen blocks. To standardise the data from the multitude of systems, Geoscience Australia (GA) employed a comprehensive set of technical specifications. As part of these specifications the contractors were required to fly each of the ten systems over a series of test lines termed the “Whyalla Test Lines” (Whyalla). The final GCAS data provide truly impressive high resolution regional scale products. These will allow more detailed geological interpretation of the prospective Gawler Craton. A laser altimeter was added to the list of required survey equipment. Deficiencies in the technical specifications relating to laser altimeters were identified. Standards and procedures specific to laser characteristics will need to be considered on future surveys. Analyses show that weaknesses in current standards and procedures are still evident. The weaknesses identified allow room for improvements to be made for future surveys. Gamma-ray processing results raised the most serious concerns, with repeatability not achieved. Changes to standard procedures may need to be considered.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"2 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87684500","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073061
W. Tan, V. Mikhaltsevitch, M. Lebedev, S. Glubokovskikh, B. Gurevich
Summary In this study we examine the effect of the boundary conditions on the laboratory measurements of the elastic properties of a fluid-saturated sedimentary rock at low frequencies. In laboratory experiments associated with studying fluid effects on elastic properties of a porous rock sample, the tested sample cannot be completely sealed due to the presence of the fluid lines connected to its pore space. These lines form a pore-fluid storage which can affect the results of the elastic moduli measurements of fluid-saturated rocks. We developed a modified version of the Gassmann model which can estimate the bulk moduli of fully saturated rocks in dependence on the capacity of the pore-fluid storage. Here, we compare the predictions of the modified Gassmann model with the moduli measured on an n-decane-saturated limestone sample with the volume of the pore-fluid storage changing from 2 ml to 260 ml. The experimental results were obtained using a low-frequency apparatus based on the forced-oscillation method at a frequency of 0.1 Hz. We demonstrate that the predictions of the modified Gassmann model are in good agreement with the experimental data.
{"title":"The sample boundary effect in the low-frequency measurements of the elastic moduli of rocks","authors":"W. Tan, V. Mikhaltsevitch, M. Lebedev, S. Glubokovskikh, B. Gurevich","doi":"10.1080/22020586.2019.12073061","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073061","url":null,"abstract":"Summary In this study we examine the effect of the boundary conditions on the laboratory measurements of the elastic properties of a fluid-saturated sedimentary rock at low frequencies. In laboratory experiments associated with studying fluid effects on elastic properties of a porous rock sample, the tested sample cannot be completely sealed due to the presence of the fluid lines connected to its pore space. These lines form a pore-fluid storage which can affect the results of the elastic moduli measurements of fluid-saturated rocks. We developed a modified version of the Gassmann model which can estimate the bulk moduli of fully saturated rocks in dependence on the capacity of the pore-fluid storage. Here, we compare the predictions of the modified Gassmann model with the moduli measured on an n-decane-saturated limestone sample with the volume of the pore-fluid storage changing from 2 ml to 260 ml. The experimental results were obtained using a low-frequency apparatus based on the forced-oscillation method at a frequency of 0.1 Hz. We demonstrate that the predictions of the modified Gassmann model are in good agreement with the experimental data.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"7 1","pages":"1 - 3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87900734","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073057
J. Slade
Summary The challenges in drilling a high pressure and high temperature (HPHT) well are unique to every opportunity. The key to successfully drilling an HPHT well is to utilise the appropriate people, technology and design at the appropriate time. To do this it is critical to know the questions that need solving. Knowing and answering these questions cannot be effectively achieved without accessing subject matter experts in several disciplines including drilling, petrophysics and data acquisition and integrating into a coherent plan.
{"title":"What you need to know to drill a high pressure, high temperature well","authors":"J. Slade","doi":"10.1080/22020586.2019.12073057","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073057","url":null,"abstract":"Summary The challenges in drilling a high pressure and high temperature (HPHT) well are unique to every opportunity. The key to successfully drilling an HPHT well is to utilise the appropriate people, technology and design at the appropriate time. To do this it is critical to know the questions that need solving. Knowing and answering these questions cannot be effectively achieved without accessing subject matter experts in several disciplines including drilling, petrophysics and data acquisition and integrating into a coherent plan.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"1 1","pages":"1 - 3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88178751","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073184
Roshanak Vadoodi, Thorkild M Rasmussen, Maxim Yu Smirnov
Summary Broadband magnetotelluric data were recorded at 104 sites between 2015-2018 in northern Sweden to image the geoelectrical upper and lower crustal structures. Data processing was performed using a robust multi-remote reference technique. The dimensionality analysis of the phase tensors indicate complex 3D structures in the area. A 3D crustal model of the electrical conductivity structure was derived based on 3D inversion of the data. Processing of regional potential field data was performed and structural information derived from these data were compared with the 3D conductivity model. Locations of known mineralizations are compared to the regional geophysical data in order to investigate how the regional geophysical data can be used for better informed mineral exploration. The analyses indicate that regional geophysical can provide very useful information with respect to the prospectivity of different areas.
{"title":"Regional magnetotelluric and potential field data analyses related to mineral exploration of the Fennoscandian Shield, Sweden","authors":"Roshanak Vadoodi, Thorkild M Rasmussen, Maxim Yu Smirnov","doi":"10.1080/22020586.2019.12073184","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073184","url":null,"abstract":"Summary Broadband magnetotelluric data were recorded at 104 sites between 2015-2018 in northern Sweden to image the geoelectrical upper and lower crustal structures. Data processing was performed using a robust multi-remote reference technique. The dimensionality analysis of the phase tensors indicate complex 3D structures in the area. A 3D crustal model of the electrical conductivity structure was derived based on 3D inversion of the data. Processing of regional potential field data was performed and structural information derived from these data were compared with the 3D conductivity model. Locations of known mineralizations are compared to the regional geophysical data in order to investigate how the regional geophysical data can be used for better informed mineral exploration. The analyses indicate that regional geophysical can provide very useful information with respect to the prospectivity of different areas.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"13 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84972825","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073067
S. Jakica, Lucy I. Brisbout
Summary This study uses shallow passive seismic HVSR (horizontal-to-vertical spectral ratio) technique to determine the depth and extent of a Cenozoic paleochannel composed dominantly of sand and clay incised into the Proterozoic granitic basement of the Capricorn Orogen. The paleochannel contains sand-dominated intervals that host water that is presently being explored by Hastings Metals. There is some drilling data available but only a few drill cores intersect the basement. Improved understanding of the paleochannel geometry will assist with water exploration. The measured resonant frequency is related to shear wave velocity (Vs) and layer thickness. Passive seismic measurements at drill hole SWMB007 allow us to define a Vs for the regolith package overlying the basement. This Vs value is applied to 53 passive seismic measurements along Traverse 7 and the thickness of the paleochannel has been imaged in normalised H/V amplitude images. Along Traverse 7, HVSR data image a symmetrical paleochannel with a maximum depth of ~115 m. The geometry of the paleochannel imaged is broadly similar to the geometry obtained from 2.5D AEM inversion. However, the paleochannel has a greater maximum depth in AEM and some internal features of the paleochannel also differ.
{"title":"Application of passive seismic and AEM to 3D paleochannel imaging: Capricorn Orogen","authors":"S. Jakica, Lucy I. Brisbout","doi":"10.1080/22020586.2019.12073067","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073067","url":null,"abstract":"Summary This study uses shallow passive seismic HVSR (horizontal-to-vertical spectral ratio) technique to determine the depth and extent of a Cenozoic paleochannel composed dominantly of sand and clay incised into the Proterozoic granitic basement of the Capricorn Orogen. The paleochannel contains sand-dominated intervals that host water that is presently being explored by Hastings Metals. There is some drilling data available but only a few drill cores intersect the basement. Improved understanding of the paleochannel geometry will assist with water exploration. The measured resonant frequency is related to shear wave velocity (Vs) and layer thickness. Passive seismic measurements at drill hole SWMB007 allow us to define a Vs for the regolith package overlying the basement. This Vs value is applied to 53 passive seismic measurements along Traverse 7 and the thickness of the paleochannel has been imaged in normalised H/V amplitude images. Along Traverse 7, HVSR data image a symmetrical paleochannel with a maximum depth of ~115 m. The geometry of the paleochannel imaged is broadly similar to the geometry obtained from 2.5D AEM inversion. However, the paleochannel has a greater maximum depth in AEM and some internal features of the paleochannel also differ.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"14 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84395183","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073150
D. Peyrot, M. Keep, J. Scibiorski, E. McCartain, P. Baillie, J. Soares, D. Haig, A. Mory
Summary The logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian–early Norian (Samaropollenites speciosus Zone). Sedimentary structures indicate a turbidite origin and petrographic analysis reveals a high proportion of volcanic lithic grains. Palynological material presents a variable preservation suggesting a complex pre-burial history involving longdistance transport. The presence of prasinophytes suggests anoxic and euxinic depositional settings.
{"title":"The Foura Sandstone type section (Samaropollenites speciosus Zone, Carnian–early Norian; early Late Triassic), Timor-Leste: preliminary correlation between Timor and the Bonaparte Basin","authors":"D. Peyrot, M. Keep, J. Scibiorski, E. McCartain, P. Baillie, J. Soares, D. Haig, A. Mory","doi":"10.1080/22020586.2019.12073150","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073150","url":null,"abstract":"Summary The logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian–early Norian (Samaropollenites speciosus Zone). Sedimentary structures indicate a turbidite origin and petrographic analysis reveals a high proportion of volcanic lithic grains. Palynological material presents a variable preservation suggesting a complex pre-burial history involving longdistance transport. The presence of prasinophytes suggests anoxic and euxinic depositional settings.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"1 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78452837","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073105
Cericia Martinez, J. Gunning, Juerg Hauser
Summary Probabilistic inversions of wide angle reflection and refraction data for crustal velocity models are regularly employed to understand the robustness of velocity models that can be inferred from these data. It is well understood that the uncertainties associated with the picks of individual arrivals contribute to overall model uncertainty. Typically only a modicum of effort is devoted to quantifying uncertainty in the traveltime picks; a constant noise estimate is commonly assigned to a given class of arrivals. Further, determining the class of arrivals is often left to the behest of the interpreter, contributing additional uncertainty to the data that is both difficult to quantify and may be altogether incorrect. Given the crucial role data uncertainty plays in characterising model robustness, there is a need to thoroughly and appropriately quantify uncertainty in the traveltime data which itself is inferred from the waveform. Here we propose a method that treats arrival or phase classification as part of the velocity model building (inversion) framework using the well-established expectation-maximization (EM) algorithm.
{"title":"Combining arrival classification and velocity model building using expectation-maximization","authors":"Cericia Martinez, J. Gunning, Juerg Hauser","doi":"10.1080/22020586.2019.12073105","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073105","url":null,"abstract":"Summary Probabilistic inversions of wide angle reflection and refraction data for crustal velocity models are regularly employed to understand the robustness of velocity models that can be inferred from these data. It is well understood that the uncertainties associated with the picks of individual arrivals contribute to overall model uncertainty. Typically only a modicum of effort is devoted to quantifying uncertainty in the traveltime picks; a constant noise estimate is commonly assigned to a given class of arrivals. Further, determining the class of arrivals is often left to the behest of the interpreter, contributing additional uncertainty to the data that is both difficult to quantify and may be altogether incorrect. Given the crucial role data uncertainty plays in characterising model robustness, there is a need to thoroughly and appropriately quantify uncertainty in the traveltime data which itself is inferred from the waveform. Here we propose a method that treats arrival or phase classification as part of the velocity model building (inversion) framework using the well-established expectation-maximization (EM) algorithm.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"26 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84823794","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 : 2019-12-01DOI: 10.1080/22020586.2019.12072947
Shuich Desaki, Yuki Kobayashi, Peter Miklavs
Summary In this study, we performed rock physics analysis and modelling in the Browse Basin, in which we analysed the relationships among elastic properties of end-member (EM) sandstone (SST) and EM-shale, and then, modelled the properties of non-EM-SST and non-EM-shale to simulate seismic amplitude responses at boundaries of realistic litho-facies. We found that the elastic properties of SST of the basin has similar trends to those in other basins; therefore, we adopted existing rock physics relationships with minor adjustments. On the other hand, it was found that the careful consideration of mineralogy and overpressure is required in the EM-shale trend analysis. The observed data was well defined by a semi-empirical rock physics model including the effect of the volume of clay (Vcl) variation and by an “Equivalent depth method” which accounts for overpressure. To express the elastic behaviour in mixed sand-clay systems, we adopted a “Triangular diagram model” and the established trends of defined EM facies. Simulated properties from this approach agree well with actual data from the Browse Basin.
{"title":"Statistical rock physics analysis and modelling in the Browse Basin","authors":"Shuich Desaki, Yuki Kobayashi, Peter Miklavs","doi":"10.1080/22020586.2019.12072947","DOIUrl":"https://doi.org/10.1080/22020586.2019.12072947","url":null,"abstract":"Summary In this study, we performed rock physics analysis and modelling in the Browse Basin, in which we analysed the relationships among elastic properties of end-member (EM) sandstone (SST) and EM-shale, and then, modelled the properties of non-EM-SST and non-EM-shale to simulate seismic amplitude responses at boundaries of realistic litho-facies. We found that the elastic properties of SST of the basin has similar trends to those in other basins; therefore, we adopted existing rock physics relationships with minor adjustments. On the other hand, it was found that the careful consideration of mineralogy and overpressure is required in the EM-shale trend analysis. The observed data was well defined by a semi-empirical rock physics model including the effect of the volume of clay (Vcl) variation and by an “Equivalent depth method” which accounts for overpressure. To express the elastic behaviour in mixed sand-clay systems, we adopted a “Triangular diagram model” and the established trends of defined EM facies. Simulated properties from this approach agree well with actual data from the Browse Basin.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"14 1","pages":"1 - 6"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90539631","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 : 2019-12-01DOI: 10.1080/22020586.2019.12073213
M. Hatch, O. Batelaan, E. Banks, S. Douangsavanh
Summary Lao PDR is a poorly developed country, with a large rural population which relies heavily on agricultural production. The Vientiane Plain is one of the most important and largest agricultural production areas with plans to expand the area under irrigated agriculture. Historically, surface water has been used because of its relative abundance with limited consideration to use groundwater. Where groundwater development has occurred for irrigation there is little or no management, and what little there is, is based on very poor hydrogeological information. A lack of knowledge of where to site wells has led to well failure and poor water quality. This project was initiated through the Society of Exploration Geophysics - Geoscientists without Borders Program to: teach local scientists, both university-based, as well as from the government, about the latest in hydrogeophysical technology and how it can be used in the Lao PDR. Specifically we looked to apply hydrogeophysical techniques to characterise the hydrogeology of the Vientiane Plain; to evaluate the quantity and quality of groundwater that may be available; and to enhance the scientific knowledge of local resource users. Two field trips were undertaken in 2018 and 2019 to conduct workshops and training with in-country government department officials and students from the Laos University. Results from the project identified and mapped highly conductive zones related to saline geological features which would be unsuitable locations for well locations for groundwater irrigation.
{"title":"Geophysics used to help find good quality groundwater in the Vientiane Plain, Lao PDR","authors":"M. Hatch, O. Batelaan, E. Banks, S. Douangsavanh","doi":"10.1080/22020586.2019.12073213","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073213","url":null,"abstract":"Summary Lao PDR is a poorly developed country, with a large rural population which relies heavily on agricultural production. The Vientiane Plain is one of the most important and largest agricultural production areas with plans to expand the area under irrigated agriculture. Historically, surface water has been used because of its relative abundance with limited consideration to use groundwater. Where groundwater development has occurred for irrigation there is little or no management, and what little there is, is based on very poor hydrogeological information. A lack of knowledge of where to site wells has led to well failure and poor water quality. This project was initiated through the Society of Exploration Geophysics - Geoscientists without Borders Program to: teach local scientists, both university-based, as well as from the government, about the latest in hydrogeophysical technology and how it can be used in the Lao PDR. Specifically we looked to apply hydrogeophysical techniques to characterise the hydrogeology of the Vientiane Plain; to evaluate the quantity and quality of groundwater that may be available; and to enhance the scientific knowledge of local resource users. Two field trips were undertaken in 2018 and 2019 to conduct workshops and training with in-country government department officials and students from the Laos University. Results from the project identified and mapped highly conductive zones related to saline geological features which would be unsuitable locations for well locations for groundwater irrigation.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"47 1","pages":"1 - 3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80855885","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：