Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin
In 2012, China's first national shale gas demonstrations areas were set up in the Sichuan Basin. After 10 years' construction and practice, the giant marine shale gas area of 10 × 1012 m3 level is built up in the Sichuan Basin, and shale gas steps into a new stage of large-scale benefit ex...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2023-04-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854023000128 |
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| author | Dazhong Dong Feng Liang Quanzhong Guan Yuqiang Jiang Shangwen Zhou Rongze Yu Yifan Gu Surong Zhang Lin Qi Yan Liu |
| author_facet | Dazhong Dong Feng Liang Quanzhong Guan Yuqiang Jiang Shangwen Zhou Rongze Yu Yifan Gu Surong Zhang Lin Qi Yan Liu |
| author_sort | Dazhong Dong |
| collection | DOAJ |
| description | In 2012, China's first national shale gas demonstrations areas were set up in the Sichuan Basin. After 10 years' construction and practice, the giant marine shale gas area of 10 × 1012 m3 level is built up in the Sichuan Basin, and shale gas steps into a new stage of large-scale benefit exploration and development. In order to systematically summarize the achievements in shale gas exploration and development and provide guidance and reference for the exploration and development of deep shale gas and shale oil & gas in other areas, this paper systematically summarizes the main characteristics, development models and key identification and evaluation technologies for quality reservoirs of Wufeng Formation–Longmaxi Formation shale gas by analyzing the electric property, lithofacies, reservoir parameters and microscopic porosity of key wells in the basin. And the following research results are obtained. First, biogenetic siliceous shale, calcareous shale and mixed shale are main lithofacies types in quality shale gas reservoirs, and they are formed in the environment of semi-deep and deep water continental shelf. Their lateral distribution is controlled by the paleogeomorphology and their vertical development is influenced by provenance, redox condition and paleo productivity. They are 25–90 m thick. Second, in the quality shale gas reservoirs develop organic pores, inorganic pore and microfractures (including lamina/bedding fractures), among which, organic pore is one of the main reservoir spaces and microfracture is not only indispensable reservoir space, but also production pathway. The reservoir space of shale gas is overall micro-nano pore, and macropores play an important role in shale gas enrichment. Third, three development models of quality reservoir are established, including sedimentary type, diagenesis type and reworking type. The sedimentary type is the foundation. Multiple quality reservoirs are developed in the high U/Th interval of graptolite belt at the bottom of Longmaxi Formation, and their thickness is mainly controlled by paleogeomorphology and especially greater in the depression area. The diagenesis type is divided into three forms, i.e., syngenetic-early diagenetic rigid support, middle-late diagenetic mineral-organic matter transformation, and overpressure relief compaction. The reworking type is dominated by quality reservoirs with microfractures. Fourth, the core technologies for identifying and evaluating quality shale gas reservoir include large-size core and rock slice observation, high-accuracy rock mineral identification, experimental gas content test and simulation, SEM microscopic characterization, 3D microscopic pore reconstruction, comprehensive geophysical interpretation and prediction and big data analysis. In conclusion, nearly 10 years' research and practice achievements in demonstration area construction can deepen the understanding on domestic quality shale gas reservoirs, promote the effective development of the theories and technologies related to shale gas reservoirs, improve the prediction accuracy of shale gas sweet spot zones/intervals, and expand the shale gas exploration and development achievements of demonstration areas. |
| first_indexed | 2024-04-24T14:11:18Z |
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| id | doaj.art-c605eb1aad104c168ba5f29690102b8a |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-04-24T14:11:18Z |
| publishDate | 2023-04-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Natural Gas Industry B |
| spelling | doaj.art-c605eb1aad104c168ba5f29690102b8a2024-04-03T09:23:03ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402023-04-01102165182Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan BasinDazhong Dong0Feng Liang1Quanzhong Guan2Yuqiang Jiang3Shangwen Zhou4Rongze Yu5Yifan Gu6Surong Zhang7Lin Qi8Yan Liu9PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; National Energy Shale Gas R & D Center, Langfang, Hebei 065007, China; Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; National Energy Shale Gas R & D Center, Langfang, Hebei 065007, ChinaChengdu University of Technology, Chengdu, Sichuan 610059, China; Corresponding author.Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; National Energy Shale Gas R & D Center, Langfang, Hebei 065007, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; National Energy Shale Gas R & D Center, Langfang, Hebei 065007, ChinaSouthwest Petroleum University, Chengdu, Sichuan 610500, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, ChinaGeological Exploration & Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610051, ChinaChengdu University of Technology, Chengdu, Sichuan 610059, ChinaIn 2012, China's first national shale gas demonstrations areas were set up in the Sichuan Basin. After 10 years' construction and practice, the giant marine shale gas area of 10 × 1012 m3 level is built up in the Sichuan Basin, and shale gas steps into a new stage of large-scale benefit exploration and development. In order to systematically summarize the achievements in shale gas exploration and development and provide guidance and reference for the exploration and development of deep shale gas and shale oil & gas in other areas, this paper systematically summarizes the main characteristics, development models and key identification and evaluation technologies for quality reservoirs of Wufeng Formation–Longmaxi Formation shale gas by analyzing the electric property, lithofacies, reservoir parameters and microscopic porosity of key wells in the basin. And the following research results are obtained. First, biogenetic siliceous shale, calcareous shale and mixed shale are main lithofacies types in quality shale gas reservoirs, and they are formed in the environment of semi-deep and deep water continental shelf. Their lateral distribution is controlled by the paleogeomorphology and their vertical development is influenced by provenance, redox condition and paleo productivity. They are 25–90 m thick. Second, in the quality shale gas reservoirs develop organic pores, inorganic pore and microfractures (including lamina/bedding fractures), among which, organic pore is one of the main reservoir spaces and microfracture is not only indispensable reservoir space, but also production pathway. The reservoir space of shale gas is overall micro-nano pore, and macropores play an important role in shale gas enrichment. Third, three development models of quality reservoir are established, including sedimentary type, diagenesis type and reworking type. The sedimentary type is the foundation. Multiple quality reservoirs are developed in the high U/Th interval of graptolite belt at the bottom of Longmaxi Formation, and their thickness is mainly controlled by paleogeomorphology and especially greater in the depression area. The diagenesis type is divided into three forms, i.e., syngenetic-early diagenetic rigid support, middle-late diagenetic mineral-organic matter transformation, and overpressure relief compaction. The reworking type is dominated by quality reservoirs with microfractures. Fourth, the core technologies for identifying and evaluating quality shale gas reservoir include large-size core and rock slice observation, high-accuracy rock mineral identification, experimental gas content test and simulation, SEM microscopic characterization, 3D microscopic pore reconstruction, comprehensive geophysical interpretation and prediction and big data analysis. In conclusion, nearly 10 years' research and practice achievements in demonstration area construction can deepen the understanding on domestic quality shale gas reservoirs, promote the effective development of the theories and technologies related to shale gas reservoirs, improve the prediction accuracy of shale gas sweet spot zones/intervals, and expand the shale gas exploration and development achievements of demonstration areas.http://www.sciencedirect.com/science/article/pii/S2352854023000128Sichuan basinWufeng formation-Longmaxi formationShale gasQuality reservoirDevelopment modelBig data |
| spellingShingle | Dazhong Dong Feng Liang Quanzhong Guan Yuqiang Jiang Shangwen Zhou Rongze Yu Yifan Gu Surong Zhang Lin Qi Yan Liu Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin Natural Gas Industry B Sichuan basin Wufeng formation-Longmaxi formation Shale gas Quality reservoir Development model Big data |
| title | Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin |
| title_full | Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin |
| title_fullStr | Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin |
| title_full_unstemmed | Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin |
| title_short | Development model and identification of evaluation technology for Wufeng Formation–Longmaxi Formation quality shale gas reservoirs in the Sichuan Basin |
| title_sort | development model and identification of evaluation technology for wufeng formation longmaxi formation quality shale gas reservoirs in the sichuan basin |
| topic | Sichuan basin Wufeng formation-Longmaxi formation Shale gas Quality reservoir Development model Big data |
| url | http://www.sciencedirect.com/science/article/pii/S2352854023000128 |
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