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Paleotectonic stress field modeling and fracture prediction of the Longmaxi Formation in the N216 well block, Southern Sichuan Basin, China

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Abstract

To quantitatively describe the developmental characteristics of tectonic fractures in shale reservoirs, taking the early Silurian Longmaxi Formation in the Changning area in southern Sichuan, China, as an example, the fracture characteristics are described through fracture observations in field outcrops and in cores. The paleotectonic stress field is reconstructed by a numerical simulation method to predict the distribution of tectonic fractures. According to the evolution and characteristics of the study area, two geological models of the main tectonic stages of fracture development are established: the late Yanshanian to early Himalayan and the middle Himalayan to late Himalayan. The results show that the paleotectonic stress in the study area is mainly compressive stress and that the stress is high in the upper part of the structure. In the fault zone, the stress decreases and releases stress. The grade I fracture development area is mainly located near NE-trending faults, has a fracture coefficient of > 1.132, and is strip-shaped, which may lead to shale gas leakage and greatly impact shale gas productivity.

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Acknowledgements

The authors are very grateful to Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company, for their kind help and support to complete this study. The authors would like to thank the staff of all of the laboratories that cooperated in performing the tests and analyses.

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Authors and Affiliations

  1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China

    Jiajie Li, Qirong Qin & Hu Li

  2. Department of Railway Engineering, Sichuan College of Architectural Technology, Chengdu, 610399, People’s Republic of China

    Hu Li

  3. Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu, 610051, People’s Republic of China

    Shengxian Zhao

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  1. Jiajie Li
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Correspondence to Hu Li.

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Li, J., Qin, Q., Li, H. et al. Paleotectonic stress field modeling and fracture prediction of the Longmaxi Formation in the N216 well block, Southern Sichuan Basin, China. Arab J Geosci 15, 347 (2022). https://doi.org/10.1007/s12517-022-09616-z

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