Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin
No breakthrough has been made in petroleum exploration of the Sinian Dengying Formation in the southeastern Sichuan Basin as the major factors controlling the hydrocarbon accumulation of the Dengying Formation have not been well established, including the development period and distribution of the p...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-07-01
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| Series: | Energy Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666759222000968 |
| _version_ | 1827919959233134592 |
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| author | Shuangjian Li Wei Sun Yingqiang Li Jian Gao Zhiyuan Liu Xiaokuan Feng |
| author_facet | Shuangjian Li Wei Sun Yingqiang Li Jian Gao Zhiyuan Liu Xiaokuan Feng |
| author_sort | Shuangjian Li |
| collection | DOAJ |
| description | No breakthrough has been made in petroleum exploration of the Sinian Dengying Formation in the southeastern Sichuan Basin as the major factors controlling the hydrocarbon accumulation of the Dengying Formation have not been well established, including the development period and distribution of the platform margin, the effectiveness of the source-reservoir combination and the reliability of the Cambrian pre-salt structural trap. Based on the interpretation of seismic data and hydrocarbon-source correlation, the distribution of the platform margin of the Sinian Dengying Formation in the southeastern Sichuan Basin was mapped. Moreover, the gas source rocks of the Dengying Formation were clarified according to geochemical characteristics of fluid inclusions, and the pre-salt structures were further confirmed by seismic forward modeling and experiments of prestack depth migration. Results showed that the sedimentary facies of the 4th member of Dengying Formation in the southeastern Sichuan Basin was platform margin of gentle slope type. The platform margin reservoir of the Dengying Formation and the Lower Cambrian source rocks constitute a favorable source - reservoir combination. The carbon isotope characteristics of gas in fluid inclusions indicate that some of the oil/gas in the Dengying Formation were contributed by the Doushantuo Formation source rocks. As the difference in seismic velocities between carbonate rocks and gypsum/salt beds may cause a reduction in the amplitude of pre-salt structures, the low-amplitude structures identified on current seismic profiles are underestimated instead of overestimated. Accordingly, the Sinian structural traps are confirmed to develop in the deep pre-salt sequences in the low-steep anticline belt, southeastern Sichuan Basin. On the basis of the above new understanding, we propose two types of hydrocarbon migration modes for the Sinian Dengying Formation in southeastern Sichuan Basin, including lateral migration of hydrocarbons generated from the Cambrian Qiongzusi Formation and vertical migration of hydrocarbons derived from the Sinian Doushantuo Formation. Lithologic traps at the platform margin and pre-salt structural traps within the platform are favorable targets for natural gas exploration. |
| first_indexed | 2024-03-13T04:05:56Z |
| format | Article |
| id | doaj.art-0eee64e2071e4fb08c0a62fe3be6d539 |
| institution | Directory Open Access Journal |
| issn | 2666-7592 |
| language | English |
| last_indexed | 2024-03-13T04:05:56Z |
| publishDate | 2023-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Energy Geoscience |
| spelling | doaj.art-0eee64e2071e4fb08c0a62fe3be6d5392023-06-21T07:00:56ZengKeAi Communications Co., Ltd.Energy Geoscience2666-75922023-07-0143100154Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan BasinShuangjian Li0Wei Sun1Yingqiang Li2Jian Gao3Zhiyuan Liu4Xiaokuan Feng5Key Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, China; SINOPEC Petroleum Exploration & Production Research Institute, Beijing, 102206, China; Corresponding author. Key Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, China.Key Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, China; SINOPEC Petroleum Exploration & Production Research Institute, Beijing, 102206, ChinaKey Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, China; SINOPEC Petroleum Exploration & Production Research Institute, Beijing, 102206, ChinaKey Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, China; SINOPEC Petroleum Exploration & Production Research Institute, Beijing, 102206, ChinaKey Laboratory of Geology and Resources in Deep Stratum, SINOPEC, Beijing, 102206, ChinaSchool of Energy Resources, China University of Geosciences, Beijing, 100083, ChinaNo breakthrough has been made in petroleum exploration of the Sinian Dengying Formation in the southeastern Sichuan Basin as the major factors controlling the hydrocarbon accumulation of the Dengying Formation have not been well established, including the development period and distribution of the platform margin, the effectiveness of the source-reservoir combination and the reliability of the Cambrian pre-salt structural trap. Based on the interpretation of seismic data and hydrocarbon-source correlation, the distribution of the platform margin of the Sinian Dengying Formation in the southeastern Sichuan Basin was mapped. Moreover, the gas source rocks of the Dengying Formation were clarified according to geochemical characteristics of fluid inclusions, and the pre-salt structures were further confirmed by seismic forward modeling and experiments of prestack depth migration. Results showed that the sedimentary facies of the 4th member of Dengying Formation in the southeastern Sichuan Basin was platform margin of gentle slope type. The platform margin reservoir of the Dengying Formation and the Lower Cambrian source rocks constitute a favorable source - reservoir combination. The carbon isotope characteristics of gas in fluid inclusions indicate that some of the oil/gas in the Dengying Formation were contributed by the Doushantuo Formation source rocks. As the difference in seismic velocities between carbonate rocks and gypsum/salt beds may cause a reduction in the amplitude of pre-salt structures, the low-amplitude structures identified on current seismic profiles are underestimated instead of overestimated. Accordingly, the Sinian structural traps are confirmed to develop in the deep pre-salt sequences in the low-steep anticline belt, southeastern Sichuan Basin. On the basis of the above new understanding, we propose two types of hydrocarbon migration modes for the Sinian Dengying Formation in southeastern Sichuan Basin, including lateral migration of hydrocarbons generated from the Cambrian Qiongzusi Formation and vertical migration of hydrocarbons derived from the Sinian Doushantuo Formation. Lithologic traps at the platform margin and pre-salt structural traps within the platform are favorable targets for natural gas exploration.http://www.sciencedirect.com/science/article/pii/S2666759222000968Source-reservoir combinationFluid inclusionPlay fairwayDengying formationSoutheastern Sichuan Basin |
| spellingShingle | Shuangjian Li Wei Sun Yingqiang Li Jian Gao Zhiyuan Liu Xiaokuan Feng Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin Energy Geoscience Source-reservoir combination Fluid inclusion Play fairway Dengying formation Southeastern Sichuan Basin |
| title | Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin |
| title_full | Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin |
| title_fullStr | Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin |
| title_full_unstemmed | Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin |
| title_short | Hydrocarbon accumulation conditions and exploration targets of the Sinian Dengying Formation in the Southeastern Sichuan Basin |
| title_sort | hydrocarbon accumulation conditions and exploration targets of the sinian dengying formation in the southeastern sichuan basin |
| topic | Source-reservoir combination Fluid inclusion Play fairway Dengying formation Southeastern Sichuan Basin |
| url | http://www.sciencedirect.com/science/article/pii/S2666759222000968 |
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