Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region
The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorp...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Jiawei FAN [verfasserIn] Kongquan CHEN [verfasserIn] Junjun SHEN [verfasserIn] Wei ZHU [verfasserIn] Xiehua TANG [verfasserIn] Junjun LI [verfasserIn] Pengwan WANG [verfasserIn] Fang ZHANG [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Chinesisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Shiyou shiyan dizhi - Editorial Office of Petroleum Geology and Experiment, 2024, 42(2020), 1, Seite 69-78 |
|---|---|
| Übergeordnetes Werk: |
volume:42 ; year:2020 ; number:1 ; pages:69-78 |
| Links: |
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| DOI / URN: |
10.11781/sysydz202001069 |
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| Katalog-ID: |
DOAJ095548726 |
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| 520 | |a The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. | ||
| 650 | 4 | |a shale reservoir | |
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| 700 | 0 | |a Fang ZHANG |e verfasserin |4 aut | |
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10.11781/sysydz202001069 doi (DE-627)DOAJ095548726 (DE-599)DOAJ24a634df9c3741ea9c83d31a42f48be5 DE-627 ger DE-627 rakwb chi QC801-809 QE1-996.5 Jiawei FAN verfasserin aut Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. shale reservoir pore structure gas-bearing capacity horizontal box ordovician wufeng-silurian longmaxi formations dangyang synclinorium middle yangze region Geophysics. Cosmic physics Geology Kongquan CHEN verfasserin aut Junjun SHEN verfasserin aut Wei ZHU verfasserin aut Xiehua TANG verfasserin aut Junjun LI verfasserin aut Pengwan WANG verfasserin aut Fang ZHANG verfasserin aut In Shiyou shiyan dizhi Editorial Office of Petroleum Geology and Experiment, 2024 42(2020), 1, Seite 69-78 (DE-627)1681607743 (DE-600)2999009-9 10016112 nnns volume:42 year:2020 number:1 pages:69-78 https://doi.org/10.11781/sysydz202001069 kostenfrei https://doaj.org/article/24a634df9c3741ea9c83d31a42f48be5 kostenfrei https://www.sysydz.net/cn/article/doi/10.11781/sysydz202001069 kostenfrei https://doaj.org/toc/1001-6112 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_2817 AR 42 2020 1 69-78 |
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10.11781/sysydz202001069 doi (DE-627)DOAJ095548726 (DE-599)DOAJ24a634df9c3741ea9c83d31a42f48be5 DE-627 ger DE-627 rakwb chi QC801-809 QE1-996.5 Jiawei FAN verfasserin aut Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. shale reservoir pore structure gas-bearing capacity horizontal box ordovician wufeng-silurian longmaxi formations dangyang synclinorium middle yangze region Geophysics. Cosmic physics Geology Kongquan CHEN verfasserin aut Junjun SHEN verfasserin aut Wei ZHU verfasserin aut Xiehua TANG verfasserin aut Junjun LI verfasserin aut Pengwan WANG verfasserin aut Fang ZHANG verfasserin aut In Shiyou shiyan dizhi Editorial Office of Petroleum Geology and Experiment, 2024 42(2020), 1, Seite 69-78 (DE-627)1681607743 (DE-600)2999009-9 10016112 nnns volume:42 year:2020 number:1 pages:69-78 https://doi.org/10.11781/sysydz202001069 kostenfrei https://doaj.org/article/24a634df9c3741ea9c83d31a42f48be5 kostenfrei https://www.sysydz.net/cn/article/doi/10.11781/sysydz202001069 kostenfrei https://doaj.org/toc/1001-6112 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_2817 AR 42 2020 1 69-78 |
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10.11781/sysydz202001069 doi (DE-627)DOAJ095548726 (DE-599)DOAJ24a634df9c3741ea9c83d31a42f48be5 DE-627 ger DE-627 rakwb chi QC801-809 QE1-996.5 Jiawei FAN verfasserin aut Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. shale reservoir pore structure gas-bearing capacity horizontal box ordovician wufeng-silurian longmaxi formations dangyang synclinorium middle yangze region Geophysics. Cosmic physics Geology Kongquan CHEN verfasserin aut Junjun SHEN verfasserin aut Wei ZHU verfasserin aut Xiehua TANG verfasserin aut Junjun LI verfasserin aut Pengwan WANG verfasserin aut Fang ZHANG verfasserin aut In Shiyou shiyan dizhi Editorial Office of Petroleum Geology and Experiment, 2024 42(2020), 1, Seite 69-78 (DE-627)1681607743 (DE-600)2999009-9 10016112 nnns volume:42 year:2020 number:1 pages:69-78 https://doi.org/10.11781/sysydz202001069 kostenfrei https://doaj.org/article/24a634df9c3741ea9c83d31a42f48be5 kostenfrei https://www.sysydz.net/cn/article/doi/10.11781/sysydz202001069 kostenfrei https://doaj.org/toc/1001-6112 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_2817 AR 42 2020 1 69-78 |
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10.11781/sysydz202001069 doi (DE-627)DOAJ095548726 (DE-599)DOAJ24a634df9c3741ea9c83d31a42f48be5 DE-627 ger DE-627 rakwb chi QC801-809 QE1-996.5 Jiawei FAN verfasserin aut Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. shale reservoir pore structure gas-bearing capacity horizontal box ordovician wufeng-silurian longmaxi formations dangyang synclinorium middle yangze region Geophysics. Cosmic physics Geology Kongquan CHEN verfasserin aut Junjun SHEN verfasserin aut Wei ZHU verfasserin aut Xiehua TANG verfasserin aut Junjun LI verfasserin aut Pengwan WANG verfasserin aut Fang ZHANG verfasserin aut In Shiyou shiyan dizhi Editorial Office of Petroleum Geology and Experiment, 2024 42(2020), 1, Seite 69-78 (DE-627)1681607743 (DE-600)2999009-9 10016112 nnns volume:42 year:2020 number:1 pages:69-78 https://doi.org/10.11781/sysydz202001069 kostenfrei https://doaj.org/article/24a634df9c3741ea9c83d31a42f48be5 kostenfrei https://www.sysydz.net/cn/article/doi/10.11781/sysydz202001069 kostenfrei https://doaj.org/toc/1001-6112 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_2817 AR 42 2020 1 69-78 |
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10.11781/sysydz202001069 doi (DE-627)DOAJ095548726 (DE-599)DOAJ24a634df9c3741ea9c83d31a42f48be5 DE-627 ger DE-627 rakwb chi QC801-809 QE1-996.5 Jiawei FAN verfasserin aut Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. shale reservoir pore structure gas-bearing capacity horizontal box ordovician wufeng-silurian longmaxi formations dangyang synclinorium middle yangze region Geophysics. Cosmic physics Geology Kongquan CHEN verfasserin aut Junjun SHEN verfasserin aut Wei ZHU verfasserin aut Xiehua TANG verfasserin aut Junjun LI verfasserin aut Pengwan WANG verfasserin aut Fang ZHANG verfasserin aut In Shiyou shiyan dizhi Editorial Office of Petroleum Geology and Experiment, 2024 42(2020), 1, Seite 69-78 (DE-627)1681607743 (DE-600)2999009-9 10016112 nnns volume:42 year:2020 number:1 pages:69-78 https://doi.org/10.11781/sysydz202001069 kostenfrei https://doaj.org/article/24a634df9c3741ea9c83d31a42f48be5 kostenfrei https://www.sysydz.net/cn/article/doi/10.11781/sysydz202001069 kostenfrei https://doaj.org/toc/1001-6112 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_2817 AR 42 2020 1 69-78 |
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(1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. 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shale reservoir characteristics of ordovician wufeng-silurian longmaxi formations in dangyang synclinorium, middle yangtze region |
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Shale reservoir characteristics of Ordovician Wufeng-Silurian Longmaxi formations in Dangyang synclinorium, Middle Yangtze region |
| abstract |
The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. |
| abstractGer |
The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. |
| abstract_unstemmed |
The petrological and organic geochemical characteristics, reservoir porosity types and features, and gas-bearing characteristics of organic-rich shale were systematically studied using FIB-SEM, mineral contentanalysis, organic geochemical analysis and low-temperature and low-pressure nitrogen adsorption porosity determination, and drilling data of typical wells in the Dangyang synclinorium. (1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. (3) Shale reservoirs in the S1l11(1)-S1l11(2) sublayers in the study area are the "sweetest" and the "most brittle".However, considering the convenience of real-time monitoring and adjustment of well trajectory during horizontal drilling, the upper and lower half of GR peak in the S1l11(1) sublayer should be selected as the best horizontal target of horizontal wells. |
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(1) Vertically, shale reservoirs from the Wufeng Formation(O3w) are quite different from the first section of the first member of Longmaxi Formation (S1l11). High-quality shale reservoirs are developed from S1l11(1) to S1l11(2) sublayers, with a high abundance of organic matter (2.45%-6.98%), type Ⅱ1-Ⅱ2 organic matter, rather high thermal evolution degree, high brittle mineral content (34.0%-85.5%), low clay mineral content (9.0%-40.3%), and high total gas content (1.76-4.30 m3/t). Organic pores are well developed. In the S1l11(3) sublayer, affected by the intensified Caledonian tectonic activity, terrigenous material input increased, and reservoir quality began to deteriorate. (2) Horizontally, organic-rich shale of the Wufeng-Longmaxi formations in the Dangyang synclinorium become thicker from southeast to northwest, and the reservoir quality becomes better. 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