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Petroleum Geology & Experiment  2019, Vol. 41 Issue (5): 724-730    DOI: 10.11781/sysydz201905724
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Stratigraphic division and geochemical characteristics of freshwater lacustrine shale: a case study of Jurassic Da'anzhai Section, Sichuan Basin
WANG Wei1, HUANG Dong2, YI Haiyong3, ZHAO Rongrong3, CEN Yongjing3, LI Yucong2
1. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. Exploration and Development Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610400, China;
3. Oil Resources Office, PetroChina Southwest Oil and Gas Company, Chengdu, Sichuan 610400, China
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Abstract  The fine division and resource potential evaluation of lacustrine shale in the Da'anzhai Section of the Jurassic Ziliujing Formation in the Sichuan Basin were made based on lithologic, electrical, cyclic characteristic and shale geochemical data. The Da'anzhai Section was divided into three sub-sections, Da 1, Da 1 3 and Da 3, from top to bottom. The Da 1 3 sub-section was further divided into three sub-layers, Da 1 3 a, Da 1 3 b and Da 1 3 c, from top to bottom. The Da 1 3 c sub-layer mainly developed shore-shallow lake block shale, with large lateral changes. The organic matter is mainly the humic type Ⅱ2 kerogen. The average organic carbon content is about 1%, and the average Rock-Eval S1 content is 0.8 mg HC/g rock. The Da 1 3 b sub-layer mainly developed semi-deep lacustrine shale with thin layers of dielectric limestone, showing a stable thickness. The organic matter is mainly type II1 kerogen with partial gel type. The average organic carbon content is more than 1.5%, and the average S1 content is 1.18 mg/g. The Da 1 3 a sub-layer mainly developed shallow lacustrine shale with normal and thin dielectric limestone. The organic matter is mainly type II2 kerogen with partial gel type. The average organic carbon content is 1% to 1.5%, and the average S1 content is 1.21 mg/g. Based on current geological characteristics, funds, technical conditions and exploration results, it was proposed to open up a pilot test area of lacustrine shale oil and gas in the Gongshan Temple area in central and northern Sichuan Province, and concentrate on the Da 1 3 a and Da 1 3 b sub-layers.
Key wordsgeochemistry      sub-layer fine division      shale oil and gas      lacustrine facies      Da'anzhai Section      Ziliujing Formation      Jurassic      Sichuan Basin     
Received: 29 December 2018      Published: 23 September 2019
ZTFLH:  TE122  
Cite this article:

.Stratigraphic division and geochemical characteristics of freshwater lacustrine shale: a case study of Jurassic Da'anzhai Section, Sichuan Basin[J].Petroleum Geology & Experiment,2019,41(5):724-730.

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http://www.sysydz.net/EN/10.11781/sysydz201905724     OR     http://www.sysydz.net/EN/Y2019/V41/I5/724

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