| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
LI Qiqi, XU Shang, CHEN Ke, SONG Teng, MENG Fanyang, HE Sheng, LU Yongchao, SHI Wanzhong, GOU Qiyang, WANG Yuxuan. 2022. Analysis of shale gas accumulation conditions of the Upper Permian in the Lower Yangtze Region[J]. Geology in China, 49(2): 383-397. doi: 10.12029/gc20220203
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Analysis of shale gas accumulation conditions of the Upper Permian in the Lower Yangtze Region
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Abstract
This paper is the result of oil and gas exploration engineering.
Objective The dark shale of the Longtan-Dalong Formation is widely developed in the Upper Permian of the Lower Yangtze region, which is the key formation for shale gas exploration in China. At present, the degree of exploration in this area is low, resulting in unclear understanding of shale gas accumulation conditions.
Methods The geochemical characteristics, reservoir properties, and preservation conditions of the Longtan Formation and Dalong Formation shales were studied to evaluate shale gas exploration potential and optimize favorable exploration areas.
Results The organic matter abundance of the Longtan Formation and Dalong Formation is high, TOC content is generally greater than 2.0%, the thermal evolution degree is moderate (between 1.3% and 2.5%), the reservoir space is mainly ink bottle and slit-like mesopores, the brittle mineral content is generally higher than 50%, with good hydrocarbon generation material basis and fracturability. The Longtan Formation shale is thick, with good self-sealing ability, and the preservation conditions are generally better than those of the Dalong Formation. Both of them develop various types of fractures, which are the main channels for shale gas escape. In addition, the late magmatic activity is frequent, which has a strong destructive effect on shale gas, and the preservation conditions are the key to shale gas enrichment.
Conclusions The evaluation of the Upper Permian shale gas in the Lower Yangtze area should be based on sedimentary environment, hydrocarbon generation capacity, and reservoir conditions, taking the shale gas preservation conditions as the key and adopting the principle of finding weak areas in the context of strong tectonic activity. Finally, five favorable areas were divided in the Dalong Formation and Longtan Formation in the Lower Yangtze area.
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LI Qiqi, XU Shang, CHEN Ke, SONG Teng, MENG Fanyang, HE Sheng, LU Yongchao, SHI Wanzhong, GOU Qiyang, WANG Yuxuan. 2022. Analysis of shale gas accumulation conditions of the Upper Permian in the Lower Yangtze Region[J]. Geology in China, 49(2): 383-397. doi: 10.12029/gc20220203
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Figure 1.
Location of the study area and stratigraphic column of well JY1(location map after Huang Baojia et al., 2015)
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Figure 2.
Statistical diagrams of TOC and Ro of the Upper Permian shales in the Lower Yangtze area
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Figure 3.
Ternary diagram of mineral composition of the Upper Permian shales in the Lower Yangtze region
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Figure 4.
Scanning electron microscope photos of pores in the Upper Permian shale reservoirs in the Lower Yangtze area
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Figure 5.
Adsorption/desorption isotherms of the Upper Permian shales.
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Figure 6.
Relationship between TOC content and porosity of the Upper Permian shales in the Lower Yangtze area (some drawing data from Pan et al., 2015; Cao Taotao et al., 2015)
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Figure 7.
Relationship between BET surface area and TOC content and clay mineral content of the Upper Permian shales in the Lower Yangtze area
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Figure 8.
Relationship between brittle mineral content and TOC content of the Upper Permian shales in the Lower Yangtze area
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Figure 9.
The core photos of well JY1(a-Dalong Formation; b-Longtan Formation)
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Figure 10.
Schematic diagram of failure mode of magma and fracture to shale gas
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Figure 11.
Evaluation parameter of favorable area of the Upper Permian shale gas in the Lower Yangtze region (a-Prediction of favorable area of the Dalong Formation; b-Prediction of favorable area of the Longtan Formation; c-Optimization of favorable area of the Dalong Formation; d-Optimization of favorable area of the Longtan Formation)