Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China
The lacustrine shale, represented by the Lianggaoshan Formation, is widely distributed in oil and gas basins of China and will be a key target for unconventional hydrocarbon exploration in the future. Due to the complexity of geological conditions, the distribution of lacustrine shale and the mechan...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2023-07-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1218215/full |
| _version_ | 1827906491660632064 |
|---|---|
| author | Rui Fang Rui Fang Yuqiang Jiang Yuqiang Jiang Shasha Sun Yao Luo Lin Qi Dazhong Dong Qiang Lai Yuzhuo Luo Zengzheng Jiang |
| author_facet | Rui Fang Rui Fang Yuqiang Jiang Yuqiang Jiang Shasha Sun Yao Luo Lin Qi Dazhong Dong Qiang Lai Yuzhuo Luo Zengzheng Jiang |
| author_sort | Rui Fang |
| collection | DOAJ |
| description | The lacustrine shale, represented by the Lianggaoshan Formation, is widely distributed in oil and gas basins of China and will be a key target for unconventional hydrocarbon exploration in the future. Due to the complexity of geological conditions, the distribution of lacustrine shale and the mechanism of organic matter (OM) enrichment show significant differences between different basins. In this study, seismic interpretation, core observation, high-frequency geochemical analysis and other methods are integrated to reveal factors controlling lacustrine shale distribution and OM accumulation in lacustrine shale. The results suggest that six bottom-to-top organic-rich shale intervals are identified within the Lianggaoshan Formation due to lake-basin migration. The migration process of depocenters controls the planar distribution of lacustrine organic-rich shale. The organic-rich lacustrine shale within 1st Member and 2nd Member is characterized by relatively high paleoproductivity and dysoxic condition. The lacustrine organic-rich shale of the upper to the top of 3rd Member is characterized by relatively low paleoproductivity, relatively high terrestrial input, and dysoxic condition. Paleoproductivity and preservation condition caused by lake-level rise are generally the major influencing factor of organic matter accumulation in 1st Member and 2nd Member organic-rich shale. The input of terrestrial OM, and the condition of preservation caused by rapid deposition are the major factors controlling OM accumulation in 3rd Member of Lianggaoshan Formation. |
| first_indexed | 2024-03-13T00:57:29Z |
| format | Article |
| id | doaj.art-d175d3d1c96549a5ba739dfcd6e54197 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-13T00:57:29Z |
| publishDate | 2023-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-d175d3d1c96549a5ba739dfcd6e541972023-07-06T17:02:32ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-07-011110.3389/feart.2023.12182151218215Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW ChinaRui Fang0Rui Fang1Yuqiang Jiang2Yuqiang Jiang3Shasha Sun4Yao Luo5Lin Qi6Dazhong Dong7Qiang Lai8Yuzhuo Luo9Zengzheng Jiang10School of Geosciences and Technology, Southwest Petroleum University, Chengdu, ChinaThe Unconventional Reservoir Evaluation Department, PetroChina Key Laboratory of Unconventional Oil and Gas Resources, Chengdu, ChinaSchool of Geosciences and Technology, Southwest Petroleum University, Chengdu, ChinaThe Unconventional Reservoir Evaluation Department, PetroChina Key Laboratory of Unconventional Oil and Gas Resources, Chengdu, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, ChinaSouthwest Geophysical Exploration Branch of China Petroleum Group Dongfang Geophysical Exploration Co., Ltd., Chengdu, ChinaGeology Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, ChinaGeology Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, ChinaNortheastern Sichuan Oil and Gas District, PetroChina Southwest Oil and Gas Field Company, Dazhou, ChinaSichuan Geotech Science and Technology Ltd., Company, Chengdu, ChinaThe lacustrine shale, represented by the Lianggaoshan Formation, is widely distributed in oil and gas basins of China and will be a key target for unconventional hydrocarbon exploration in the future. Due to the complexity of geological conditions, the distribution of lacustrine shale and the mechanism of organic matter (OM) enrichment show significant differences between different basins. In this study, seismic interpretation, core observation, high-frequency geochemical analysis and other methods are integrated to reveal factors controlling lacustrine shale distribution and OM accumulation in lacustrine shale. The results suggest that six bottom-to-top organic-rich shale intervals are identified within the Lianggaoshan Formation due to lake-basin migration. The migration process of depocenters controls the planar distribution of lacustrine organic-rich shale. The organic-rich lacustrine shale within 1st Member and 2nd Member is characterized by relatively high paleoproductivity and dysoxic condition. The lacustrine organic-rich shale of the upper to the top of 3rd Member is characterized by relatively low paleoproductivity, relatively high terrestrial input, and dysoxic condition. Paleoproductivity and preservation condition caused by lake-level rise are generally the major influencing factor of organic matter accumulation in 1st Member and 2nd Member organic-rich shale. The input of terrestrial OM, and the condition of preservation caused by rapid deposition are the major factors controlling OM accumulation in 3rd Member of Lianggaoshan Formation.https://www.frontiersin.org/articles/10.3389/feart.2023.1218215/fullJurassiclacustrine shalelake-basinorganic matter enrichmentLianggaoshan FormationSichuan Basin |
| spellingShingle | Rui Fang Rui Fang Yuqiang Jiang Yuqiang Jiang Shasha Sun Yao Luo Lin Qi Dazhong Dong Qiang Lai Yuzhuo Luo Zengzheng Jiang Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China Frontiers in Earth Science Jurassic lacustrine shale lake-basin organic matter enrichment Lianggaoshan Formation Sichuan Basin |
| title | Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China |
| title_full | Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China |
| title_fullStr | Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China |
| title_full_unstemmed | Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China |
| title_short | Controlling factors of organic matter accumulation and lacustrine shale distribution in Lianggaoshan Formation, Sichuan Basin, SW China |
| title_sort | controlling factors of organic matter accumulation and lacustrine shale distribution in lianggaoshan formation sichuan basin sw china |
| topic | Jurassic lacustrine shale lake-basin organic matter enrichment Lianggaoshan Formation Sichuan Basin |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1218215/full |
| work_keys_str_mv | AT ruifang controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT ruifang controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT yuqiangjiang controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT yuqiangjiang controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT shashasun controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT yaoluo controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT linqi controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT dazhongdong controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT qianglai controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT yuzhuoluo controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina AT zengzhengjiang controllingfactorsoforganicmatteraccumulationandlacustrineshaledistributioninlianggaoshanformationsichuanbasinswchina |