The Experts below are selected from a list of 366 Experts worldwide ranked by ideXlab platform
Ralf Littke - One of the best experts on this subject based on the ideXlab platform.
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geochemical and petrophysical source rock characterization of the vaca muerta formation argentina implications for Unconventional Petroleum Resource estimations
International Journal of Coal Geology, 2017Co-Authors: Mariafernanda Romerosarmiento, Sebastian Ramiroramirez, Guillaume Berthe, Marc Fleury, Ralf LittkeAbstract:Abstract The Vaca Muerta Formation is currently regarded as the most prolific source rock interval for Unconventional Petroleum exploration in Argentina. In this study, we integrate recent CT-scanner, nuclear magnetic resonance (NMR) T1-T2 and Rock-Eval Shale Play® analytical techniques, combined with classical geochemical, petrological and petrophysical methods to characterize Vaca Muerta source rocks along a vertical profile. The proposed analytical workflow was tested here on 4 samples derived from one core: the LJE-1010 borehole drilled in the lowermost Jurassic Vaca Muerta member (Neuquen Basin – Argentina), to evaluate the Unconventional hydrocarbon potential and pore network attributes. First, entire rock samples were analyzed by dual energy CT scanner to evaluate possible heterogeneities; this also helped in the selection of representative samples. Then the organic matter properties were investigated by open-system pyrolysis techniques, organic petrography and biomarker analyses as a function of the core depth. A comparative approach between open-system pyrolysis methods (e.g. Rock-Eval Basic/Bulk-Rock & Shale Play® methods vs. Source Rock Analyzer) is also illustrated in this work. Finally, petrophysical characteristics and pore network attributes in shale were estimated by gas permeability (steady-state method corrected for Klinkenberg effect), porosity and NMR methods. The investigated samples have oil-window maturity and are characterized by a network of solid bitumen. Based on new Rock-Eval Shale Play® data, the potentially producible oil present in the rock samples was estimated using the modified oil saturation index (OSI = Sh0 + Sh1 peaks × 100/TOC). Results indicate that the oil crossover effect and potential productive oils occur within intervals showing higher TOC values (~ 3 to 8 wt%). We also illustrated here that, for Unconventional shale play perspectives, Rock-Eval Shale Play® parameters (Sh0 & Sh1) allow to obtain both a better quantification of free and retained hydrocarbons in source-reservoir rock samples and correct original oil in place (OOIP) estimations in early exploration campaign for shale oil and shale gas assessment. For Vaca Muerta rock samples, OOIP estimations range from 60 to 160 bbl oil/acre-ft, approximately. We also demonstrated that the solid bitumen, oil and organic matter are clearly distinguished in the studied samples using advanced NMR T1-T2 maps obtained at different temperatures. The solid bitumen was clearly evidenced as a peak with T1/T2 ratio ~ 14 on NMR T1-T2 maps. Concerning the matrix bulk rock permeability, the obtained results showed that the most deep sample is characterized by a permeability of about 140 nanoDarcy (nD) whereas the shallower sample containing also higher amounts of organic matter is more permeable (~ 213 nD), indicating that TOC values play a main control on Vaca Muerta poromechanical characteristics. The maximum total porosity values range between 6.5 and 21.8% and were calculated in this work integrating NMR and helium porosity values. Finally, global interpretations of these obtained results suggest that the Vaca Muerta Formation could be considered as a prolific shale play interval for Unconventional Petroleum exploration in the near future.
Na Zhang - One of the best experts on this subject based on the ideXlab platform.
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conventional and Unconventional hydrocarbon Resource potential evaluation of source rocks and reservoirs a case study of the upper xiaganchaigou formation western qaidam basin northwest china
Natural resources research, 2021Co-Authors: Yanchen Song, Enze Wang, Yuting Peng, Haoting Xing, Yongxian Zheng, Jing Zhang, Na ZhangAbstract:The Paleogene upper Xiaganchaigou Formation (E32) is the most important source rock and reservoir in the Qaidam Basin. However, there are few studies on the processes of hydrocarbon accumulation in this formation; therefore, its hydrocarbon Resource potential has not been estimated reasonably. This paper evaluates the hydrocarbon generation properties in light of an improved hydrocarbon generation and expulsion potential model. According to the geochemical characteristics of source rocks and the petrological features of reservoirs, the potentials of different Resource types, including conventional oil, tight oil and shale oil, are quantified by combining the buoyancy-driven hydrocarbon accumulation depth (BHAD) and the lower limit for movable Resource abundance. The results show that the source rocks are characterized by a large thickness (more than 1000 m), moderate organic matter content, high marginal maturity and a high conversion rate (50% hydrocarbons have been discharged before Ro = 1%), which provide sufficient oil sources for reservoir formation. Moreover, the reservoirs in the Qaidam Basin consist mainly of low-porosity and low-permeability tight carbonates (porosity of 4.7% and permeability less than 1 mD). The maximum hydrocarbon generation, expulsion, retention and movable retention intensities at present are 350 × 104 t/km2, 250 × 104 t/km2, 130 × 104 t/km2 and 125 × 104 t/km2, respectively. The thresholds of hydrocarbon generation, expulsion and BHAD were 0.46% Ro, 0.67% Ro and 0.7% Ro, respectively. Moreover, the dynamic evolution process of hydrocarbon accumulation was divided into three evolution stages, namely, (a) initial hydrocarbon accumulation, (b) conventional hydrocarbon reservoir and shale oil accumulation and (c) Unconventional tight oil accumulation. The conventional oil, tight oil and movable shale oil Resource potentials were 10.44 × 108 t, 51.9 × 108 t and 390 × 108 t, respectively. This study demonstrates the good Resource prospects of E32 in the Qaidam Basin. A comprehensive workflow for Unconventional Petroleum Resource potential evaluation is provided, and it has certain reference significance for other petroliferous basins, especially those in the early Unconventional hydrocarbon exploration stage.
Mariafernanda Romerosarmiento - One of the best experts on this subject based on the ideXlab platform.
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geochemical and petrophysical source rock characterization of the vaca muerta formation argentina implications for Unconventional Petroleum Resource estimations
International Journal of Coal Geology, 2017Co-Authors: Mariafernanda Romerosarmiento, Sebastian Ramiroramirez, Guillaume Berthe, Marc Fleury, Ralf LittkeAbstract:Abstract The Vaca Muerta Formation is currently regarded as the most prolific source rock interval for Unconventional Petroleum exploration in Argentina. In this study, we integrate recent CT-scanner, nuclear magnetic resonance (NMR) T1-T2 and Rock-Eval Shale Play® analytical techniques, combined with classical geochemical, petrological and petrophysical methods to characterize Vaca Muerta source rocks along a vertical profile. The proposed analytical workflow was tested here on 4 samples derived from one core: the LJE-1010 borehole drilled in the lowermost Jurassic Vaca Muerta member (Neuquen Basin – Argentina), to evaluate the Unconventional hydrocarbon potential and pore network attributes. First, entire rock samples were analyzed by dual energy CT scanner to evaluate possible heterogeneities; this also helped in the selection of representative samples. Then the organic matter properties were investigated by open-system pyrolysis techniques, organic petrography and biomarker analyses as a function of the core depth. A comparative approach between open-system pyrolysis methods (e.g. Rock-Eval Basic/Bulk-Rock & Shale Play® methods vs. Source Rock Analyzer) is also illustrated in this work. Finally, petrophysical characteristics and pore network attributes in shale were estimated by gas permeability (steady-state method corrected for Klinkenberg effect), porosity and NMR methods. The investigated samples have oil-window maturity and are characterized by a network of solid bitumen. Based on new Rock-Eval Shale Play® data, the potentially producible oil present in the rock samples was estimated using the modified oil saturation index (OSI = Sh0 + Sh1 peaks × 100/TOC). Results indicate that the oil crossover effect and potential productive oils occur within intervals showing higher TOC values (~ 3 to 8 wt%). We also illustrated here that, for Unconventional shale play perspectives, Rock-Eval Shale Play® parameters (Sh0 & Sh1) allow to obtain both a better quantification of free and retained hydrocarbons in source-reservoir rock samples and correct original oil in place (OOIP) estimations in early exploration campaign for shale oil and shale gas assessment. For Vaca Muerta rock samples, OOIP estimations range from 60 to 160 bbl oil/acre-ft, approximately. We also demonstrated that the solid bitumen, oil and organic matter are clearly distinguished in the studied samples using advanced NMR T1-T2 maps obtained at different temperatures. The solid bitumen was clearly evidenced as a peak with T1/T2 ratio ~ 14 on NMR T1-T2 maps. Concerning the matrix bulk rock permeability, the obtained results showed that the most deep sample is characterized by a permeability of about 140 nanoDarcy (nD) whereas the shallower sample containing also higher amounts of organic matter is more permeable (~ 213 nD), indicating that TOC values play a main control on Vaca Muerta poromechanical characteristics. The maximum total porosity values range between 6.5 and 21.8% and were calculated in this work integrating NMR and helium porosity values. Finally, global interpretations of these obtained results suggest that the Vaca Muerta Formation could be considered as a prolific shale play interval for Unconventional Petroleum exploration in the near future.
Yanchen Song - One of the best experts on this subject based on the ideXlab platform.
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conventional and Unconventional hydrocarbon Resource potential evaluation of source rocks and reservoirs a case study of the upper xiaganchaigou formation western qaidam basin northwest china
Natural resources research, 2021Co-Authors: Yanchen Song, Enze Wang, Yuting Peng, Haoting Xing, Yongxian Zheng, Jing Zhang, Na ZhangAbstract:The Paleogene upper Xiaganchaigou Formation (E32) is the most important source rock and reservoir in the Qaidam Basin. However, there are few studies on the processes of hydrocarbon accumulation in this formation; therefore, its hydrocarbon Resource potential has not been estimated reasonably. This paper evaluates the hydrocarbon generation properties in light of an improved hydrocarbon generation and expulsion potential model. According to the geochemical characteristics of source rocks and the petrological features of reservoirs, the potentials of different Resource types, including conventional oil, tight oil and shale oil, are quantified by combining the buoyancy-driven hydrocarbon accumulation depth (BHAD) and the lower limit for movable Resource abundance. The results show that the source rocks are characterized by a large thickness (more than 1000 m), moderate organic matter content, high marginal maturity and a high conversion rate (50% hydrocarbons have been discharged before Ro = 1%), which provide sufficient oil sources for reservoir formation. Moreover, the reservoirs in the Qaidam Basin consist mainly of low-porosity and low-permeability tight carbonates (porosity of 4.7% and permeability less than 1 mD). The maximum hydrocarbon generation, expulsion, retention and movable retention intensities at present are 350 × 104 t/km2, 250 × 104 t/km2, 130 × 104 t/km2 and 125 × 104 t/km2, respectively. The thresholds of hydrocarbon generation, expulsion and BHAD were 0.46% Ro, 0.67% Ro and 0.7% Ro, respectively. Moreover, the dynamic evolution process of hydrocarbon accumulation was divided into three evolution stages, namely, (a) initial hydrocarbon accumulation, (b) conventional hydrocarbon reservoir and shale oil accumulation and (c) Unconventional tight oil accumulation. The conventional oil, tight oil and movable shale oil Resource potentials were 10.44 × 108 t, 51.9 × 108 t and 390 × 108 t, respectively. This study demonstrates the good Resource prospects of E32 in the Qaidam Basin. A comprehensive workflow for Unconventional Petroleum Resource potential evaluation is provided, and it has certain reference significance for other petroliferous basins, especially those in the early Unconventional hydrocarbon exploration stage.
Marc Fleury - One of the best experts on this subject based on the ideXlab platform.
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geochemical and petrophysical source rock characterization of the vaca muerta formation argentina implications for Unconventional Petroleum Resource estimations
International Journal of Coal Geology, 2017Co-Authors: Mariafernanda Romerosarmiento, Sebastian Ramiroramirez, Guillaume Berthe, Marc Fleury, Ralf LittkeAbstract:Abstract The Vaca Muerta Formation is currently regarded as the most prolific source rock interval for Unconventional Petroleum exploration in Argentina. In this study, we integrate recent CT-scanner, nuclear magnetic resonance (NMR) T1-T2 and Rock-Eval Shale Play® analytical techniques, combined with classical geochemical, petrological and petrophysical methods to characterize Vaca Muerta source rocks along a vertical profile. The proposed analytical workflow was tested here on 4 samples derived from one core: the LJE-1010 borehole drilled in the lowermost Jurassic Vaca Muerta member (Neuquen Basin – Argentina), to evaluate the Unconventional hydrocarbon potential and pore network attributes. First, entire rock samples were analyzed by dual energy CT scanner to evaluate possible heterogeneities; this also helped in the selection of representative samples. Then the organic matter properties were investigated by open-system pyrolysis techniques, organic petrography and biomarker analyses as a function of the core depth. A comparative approach between open-system pyrolysis methods (e.g. Rock-Eval Basic/Bulk-Rock & Shale Play® methods vs. Source Rock Analyzer) is also illustrated in this work. Finally, petrophysical characteristics and pore network attributes in shale were estimated by gas permeability (steady-state method corrected for Klinkenberg effect), porosity and NMR methods. The investigated samples have oil-window maturity and are characterized by a network of solid bitumen. Based on new Rock-Eval Shale Play® data, the potentially producible oil present in the rock samples was estimated using the modified oil saturation index (OSI = Sh0 + Sh1 peaks × 100/TOC). Results indicate that the oil crossover effect and potential productive oils occur within intervals showing higher TOC values (~ 3 to 8 wt%). We also illustrated here that, for Unconventional shale play perspectives, Rock-Eval Shale Play® parameters (Sh0 & Sh1) allow to obtain both a better quantification of free and retained hydrocarbons in source-reservoir rock samples and correct original oil in place (OOIP) estimations in early exploration campaign for shale oil and shale gas assessment. For Vaca Muerta rock samples, OOIP estimations range from 60 to 160 bbl oil/acre-ft, approximately. We also demonstrated that the solid bitumen, oil and organic matter are clearly distinguished in the studied samples using advanced NMR T1-T2 maps obtained at different temperatures. The solid bitumen was clearly evidenced as a peak with T1/T2 ratio ~ 14 on NMR T1-T2 maps. Concerning the matrix bulk rock permeability, the obtained results showed that the most deep sample is characterized by a permeability of about 140 nanoDarcy (nD) whereas the shallower sample containing also higher amounts of organic matter is more permeable (~ 213 nD), indicating that TOC values play a main control on Vaca Muerta poromechanical characteristics. The maximum total porosity values range between 6.5 and 21.8% and were calculated in this work integrating NMR and helium porosity values. Finally, global interpretations of these obtained results suggest that the Vaca Muerta Formation could be considered as a prolific shale play interval for Unconventional Petroleum exploration in the near future.
