Quantitative evaluation of shale brittleness based on statistics: Taking shale of Niutitang formation in western Hubei as an example

LI Juan; WANG Shengjian; TIAN Yukun; ZHOU Hui; LIU Ce; XUE Zongan

doi:10.12029/gc20210407003

GEOLOGY IN CHINA > 2025 > Accepted Manuscript > DOI: 10.12029/gc20210407003

Li Juan, Wang Shengjian, Tian Yukun, Zhou Hui, Liu Ce, Xue Zongan. 2025. Quantitative evaluation of shale brittleness based on statistics: Taking shale of Niutitang formation in western Hubei as an example[J]. Geology in China, 52(2): 1−11. DOI: 10.12029/gc20210407003

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Quantitative evaluation of shale brittleness based on statistics: Taking shale of Niutitang formation in western Hubei as an example

LI Juan^{1, 2,},
WANG Shengjian^1, ,,
TIAN Yukun³,
ZHOU Hui¹,
LIU Ce⁴,
XUE Zongan¹

1.
Oil & Gas Survey, China Geological Survey, Beijing 100083, China
2.
China University of Geosciences (Beijing), Beijing 100083, China
3.
Command Center of Natural Resources Comprehensive Survey, China Geological Survey, Beijing 100055, China
4.
Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Funds: Supported by the projects of National Science and Technology Major Project (No.2016ZX05034) and National Key Research and Development Program of China (No.2016YFC060110305).

More Information

Author Bio:
LI Juan, female, born in 1990, senior engineer, mainly engaged in the study of sedimentary and shale gas dessert evaluation; E-mail: rosejuanli@126.com
Corresponding author:
WANG Shengjian, male, born in 1980, professor level senior engineer, mainly engaged in reservoir logging evaluation and sedimentary study; E-mail: wshj0908@163.com.
Received Date: April 06, 2021
Revised Date: December 26, 2021
Available Online: March 16, 2025

Graphical Abstract

Abstract

Abstract

This paper is the result of geological survey engineering.
Objective
The brittleness of shale reservoir is one of the parameters reflecting the fracturing quality of shale gas reservoir, which has an important influence on the degree of difficulty of fracturing and the shape of fracture network.
Methods
In order to accurately evaluate the brittleness characteristics of Niutitang Formation shale reservoir in western Hubei, systematic sampling, whole rock mineral and clay content test, main and trace element content test, acoustic mechanics joint test and other analytical tests were carried out on five wells in the south wing of Huangling anticline in western Hubei. The quantitative evaluation of shale brittleness was carried out by cluster analysis and principal component analysis.
Results
There is a close relationship between minerals and rock brittleness, and the cluster analysis method can quantitatively characterize the effective brittle mineral composition and non−effective brittle mineral composition in shale; The comprehensive quantitative evaluation formula of brittleness index based on rock mechanics, mineral composition and element composition is established by using principal component analysis method, which overcomes the limitation of single method and forms the brittleness index profile of Niutitang Formation shale section in Western Hubei.
Conclusions
The results of microseismic monitoring and fracturing show that the newly established brittle index profile can accurately indicate the high brittle layer of shale, and the fracturing effect is good.
- shale gas,
- shale brittleness,
- mineral composition,
- mechanical parameters,
- elements,
- statistical analysis,
- Niutitang formation,
- geological survey engineering,
- western Hubei
Highlights
Overcoming the limitation of a single method, a brittleness index model is established by using a variety of geological factor mathematical models. The shale brittleness is quantitatively evaluated and tested in practice.

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References (48)

References

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