Research on mud shale fractures based on image logging: A case study of Jiaoshiba area

Gou Qiyang; Xu Shang; Hao Fang; Lu Yangbo; Shu Zhiguo; Wang Yuxuan

doi:10.19509/j.cnki.dzkq.2020.0620

Volume 39 Issue 6

Nov. 2020

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Gou Qiyang, Xu Shang, Hao Fang, Lu Yangbo, Shu Zhiguo, Wang Yuxuan. Research on mud shale fractures based on image logging: A case study of Jiaoshiba area[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 193-200. doi: 10.19509/j.cnki.dzkq.2020.0620

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Gou Qiyang, Xu Shang, Hao Fang, Lu Yangbo, Shu Zhiguo, Wang Yuxuan. Research on mud shale fractures based on image logging: A case study of Jiaoshiba area[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 193-200. doi: 10.19509/j.cnki.dzkq.2020.0620

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Research on mud shale fractures based on image logging: A case study of Jiaoshiba area

doi: 10.19509/j.cnki.dzkq.2020.0620

Received Date: 29 Aug 2019

Abstract

Abstract

The fracture type, development and distribution characteristics of organic-rich mud shale are important factors that affect the accumulation and dissipation of shale gas.Based on core observation and high resolution micro-resistivity image logging (FMI), the fracture development characteristics of two key wells (JYA well and JYB well) in Jiaoshiba area were described and quantitatively interpreted.Besides, the influence of fracture on shale gas-bearing property is discussed in combination with gas-bearing data.The results show that there is little difference between JYA well and JYB well in main formation and underlying formation, and the bedding fracture is the main one, but the seal condition has obvious difference.The natural fracture of the direct seal of the JYA well is relatively low, mainly high-resistance fracture, followed by high-conductivity fracture and fault.The dip angle is 20.31°-75.83° (average 44.65°), 16.65°-61.17° (average 39.43°) and 36.41°, respectively.The line density of fracture in JYA well is 0.6 bar/ m, of which fault is 0.025 bar/m.The sealing condition of JYA well is well, and the production fracturing is high-yield.However, the natural fracture of the seal condition of the JYB well is relatively high, and mainly fault, followed by high-resistance fracture and high-conductivity fracture.The dip angle is 13.71°-72.23° (average 37°), 6.9°-78.49° (average 37.9°) and 13.53°-61° (average 32°), respectively. The linear density of fracture in JYB well can reach 0.98 bar/ m, of which fault is 0.654 bar/ m.The sealing condition of JYB well is low, and the production fracturing is low-yield.Fracture type and its degree determine the condition of shale gas preservation and the degree of shale gas enrichment in different blocks.
- shale gas,
- micro-resistivity image logging,
- fracture,
- gas bearing,
- preservation condition,
- Jiaoshiba area

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References

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Research on mud shale fractures based on image logging: A case study of Jiaoshiba area

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