CHARACTERISTICS AND REGULARITY OF LONGITUDINAL GEOSTRESS DISTRIBUTION IN SAND-MUDSTONE STRATA

ZHANG Dong-tao; TONG Heng-mao; ZHAO Hai-tao; LI Xue; ZHANG Hao

2014 Vol. 20, No. 4

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ZHANG Dong-tao, TONG Heng-mao, ZHAO Hai-tao, LI Xue, ZHANG Hao. CHARACTERISTICS AND REGULARITY OF LONGITUDINAL GEOSTRESS DISTRIBUTION IN SAND-MUDSTONE STRATA[J]. Journal of Geomechanics, 2014, 20(4): 352-362.

Citation:

ZHANG Dong-tao, TONG Heng-mao, ZHAO Hai-tao, LI Xue, ZHANG Hao. CHARACTERISTICS AND REGULARITY OF LONGITUDINAL GEOSTRESS DISTRIBUTION IN SAND-MUDSTONE STRATA[J]. Journal of Geomechanics, 2014, 20(4): 352-362.

CHARACTERISTICS AND REGULARITY OF LONGITUDINAL GEOSTRESS DISTRIBUTION IN SAND-MUDSTONE STRATA

1.
State Key laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2.
Zhejiang Branch of China National Petroleum Corporation, Hangzhou 310023, China
3.
School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China

More Information

Corresponding author: TONG Heng-mao, tonghm@cup.edu.cn; tong-hm@163.com

Received Date: 04 July 2014

Publish Date: 25 December 2017

Abstract

Abstract

Based on the analysis of basin geomechanics and mechanical properties of rocks, the characteristics and regularity of geostress distribution in the sand-mudstone strata are studied with numerical modeling by using the conceptual model of sand-mudstone strata abstracted from actual sedimentary strata. The results showed that horizontal principal stress mutates at the interface of sand-mudstone strata, and the change degree is mainly related to the difference of mechanical property of rock on both sides, then the regional tectonic stress. The effect of Young Modulus on the horizontal maximum principal stress is greater than that on the horizontal minimum principal stress; while the effect of Poisson Ratio on the horizontal minimum principal stress is higher than that on the horizontal maximum principal stress. The effect of Young Modulus and Possion Ratio on the horizontal maximum principal stress is different in different stress state. In extensional strike-slip and compressional stress state, Possion Ratio has greater roughly equivalent and samller effect on the horizontal maximum principal stress respectively. While, the effect of Possion Ratio on the horizontal minimum principal stress is always greater than that of Young Modulus in different stress state. The way of lithology changes in strata (mutations or gradient) has remarkable influence on the stress difference of horizontal principal stress, while the thicknesses no effect. The above understanding is valuable for effective reservoir hydraulic fracturing and reformation.
- geostress distribution /
- numerical simulation /
- Poisson Ratio /
- Young Modulus /
- sand-mudstone

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References

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