Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area

LI Juan; CHEN Lei; JI Yubing; CHENG Qingsong

doi:10.11781/sysydz202302296

Volume 45 Issue 2

Mar. 2023

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LI Juan, CHEN Lei, JI Yubing, CHENG Qingsong. Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(2): 296-306. doi: 10.11781/sysydz202302296

Citation:

LI Juan, CHEN Lei, JI Yubing, CHENG Qingsong. Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(2): 296-306. doi: 10.11781/sysydz202302296

Citation:

LI Juan, CHEN Lei, JI Yubing, CHENG Qingsong. Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(2): 296-306. doi: 10.11781/sysydz202302296

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Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area

doi: 10.11781/sysydz202302296

LI Juan^{1, 2, 3
,},
CHEN Lei^{1, 2, 3
,
,},
JI Yubing⁴,
CHENG Qingsong⁴

1.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China
3.
Southwest Petroleum University Division of Key Laboratory of Carbonate Reservoirs, CNPC, Chengdu, Sichuan 610500, China
4.
Zhejiang Oilfield Company, PetroChina, Hangzhou, Zhejiang 310023, China

Received Date: 2022-07-22
Rev Recd Date: 2023-02-14
Publish Date: 2023-03-28

Abstract

Abstract

The exploration and development of shallow shale gas has the advantages of low cost and fast production reduction, so it has attracted wide attention. The shale gas in the Lower Silurian Longmaxi Formation (S₁l) in Taiyang block of Zhaotong National Shale Gas Demonstration Zone has the characteristics of shallow burial depth and high gas content, showing good exploration potential. However, the gas-bearing distribution and major controlling factors of shallow shale gas in this research area are rarely studied previously. In order to enrich the research in this field, this paper analyzes the gas-bearing characteristics and the major controlling factors of the shale samples of Long-1 subsection (S₁l₁) in the Taiyang block. The results show that the total gas content of S₁l₁^1-1 is the highest in the study area, the gas content gradually decreases from bottom to top, and areas with high shale gas content in S₁l₁ appear in the north and south of the study area on the plane. Organic matter content, mineral components, reservoir properties and external preservation conditions have a certain role in controlling the gas properties of shallow shale in S₁l₁¹ subsection of the study area. Organic matter is the primitivesubstance that generates shale gas, at the same time, the organic matter hole formed by hydrocarbon cracking sprovides a lot of storage pace for shale gas, while the content of organic matter is the major controlling factor of the total gas content. The high content of silicoide is conducive to later fracturing development. The adjacent rock strata of S₁l₁¹ subsection in the study area are compact in lithology, with good sealing property, showing the characteristics of slight overpressure and overpressure, which effectively prevents the escape of shale gas, and has broad exploration prospects.
- shallow shale gas,
- Longmaxi Formation,
- gas-bearing characteristics,
- controlling factors,
- Zhaotong area

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References(44)

References

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Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area

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Gas-bearing characteristics and major controlling factors of shallow marine shale: a case study of the Lower Silurian Longmaxi Formation in Taiyang block of Zhaotong area

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