Brittleness characteristics and influencing factors of marine shale of Niutitang Formation in Xuefeng region: A case study of Well XZD−1

MIAO Fengbin; PENG Zhongqin; WANG Zongxin; ZHANG Baomin; WANG Chuanshang; GONG Lei

doi:10.12029/gc20210125003

2024 Vol. 51, No. 3

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MIAO Fengbin, PENG Zhongqin, WANG Zongxin, ZHANG Baomin, WANG Chuanshang, GONG Lei. 2024. Brittleness characteristics and influencing factors of marine shale of Niutitang Formation in Xuefeng region: A case study of Well XZD−1[J]. Geology in China, 51(3): 743-761. doi: 10.12029/gc20210125003

Citation:

MIAO Fengbin, PENG Zhongqin, WANG Zongxin, ZHANG Baomin, WANG Chuanshang, GONG Lei. 2024. Brittleness characteristics and influencing factors of marine shale of Niutitang Formation in Xuefeng region: A case study of Well XZD−1[J]. Geology in China, 51(3): 743-761. doi: 10.12029/gc20210125003

Brittleness characteristics and influencing factors of marine shale of Niutitang Formation in Xuefeng region: A case study of Well XZD−1

1.
Hubei Key Laboratory of Paleontology and Geological Environment Evolution, Wuhan 430205, Hubei, China
2.
Wuhan Center of China Geological Survey, Wuhan 430205, Hubei, China
3.
College of Geosciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China

Fund Project: Supported by the project of China Geological Survey (No. DD20230323), Hubei Key Laboratory Foundation of Paleontology and Geological Environment Evolution (No. PEL−202307), National Science and Technology Major Project (No. 2016ZX05034001−002).

More Information

Author Bio: MIAO Fengbin, male, born in 1986, senior engineer, mainly engaged in the unconventional oil and gas geological study; E−mail: mfb.52163@163.com
Corresponding author: PENG Zhongqin, male, born in 1981, senior engineer, mainly engaged in the shale gas geological study; E−mail: 17360988@qq.com.

Received Date: 25 January 2021

Revised Date: 12 September 2021

Publish Date: 25 May 2024

Abstract

Abstract

This paper is the result of oil and gas exploration engineering.
Objective
The brittleness evaluation of shale reservoir is of great significance for determining the favorable stratigraphic zone in shale gas exploration and development.
Methods
Based on the basic data of mineral composition, geophysical logging, rock mechanics experiment and fracture development characteristics of Lower Cambrian Niutitang Formation in Xuefeng region, the brittleness characteristics of Niutitang Formation shale are comprehensively analyzed and evaluated by mineral composition and rock mechanics parameter based on geophysical logging, and the influencing factors of shale brittleness are discussed.
Results
The results indicate that the brittle mineral composition based on the contents of quartz, feldspar, pyrite and carbonate is the most suitable method to evaluate the brittleness of Niutitang Formation shale in this region. Taking Well XZD−1 in this area as an example, the brittleness index of Niutitang Formation shale is 59.2%−93.8%, with an average value of 74.4%, which is influenced by sedimentary environment, diagenetic evolution, burial depth, tectonism and other factors.
Conclusion
The stable deep−water shelf basin facies sedimentary environment and late diagenetic evolution stage determine that the overall brittleness of Niutitang Formation shale in Xuefeng region is relatively high. In this sedimentary environment, biogenic brittle minerals such as siliceous and pyrite are more abundant. The content of brittle minerals is affected by the change in water depth during sedimentation, showing a trend of increasing first and then decreasing from bottom to top, gradually decreasing overall. This leads to a similar vertical variation law in shale brittleness and the development of natural fractures, and the three complement each other. Meanwhile, such brittle minerals have a good positive correlation with organic matter content, and their contribution to shale brittleness is much greater than that of organic matter to shale plasticity. In addition, the correlation between rock mechanics parameters and brittleness index indicates that the Young's modulus plays a more important role in the evaluation of Niutitang Formation shale brittleness in this area than the Poisson's ratio.
- brittleness characteristics /
- influencing factors /
- Niutitang Formation /
- shale gas /
- Well XZD−1 /
- Xuefeng region /
- oil and gas exploration engineering

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References

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