JU Wei
1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China 2 Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, Shandong 266590, China 3 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSHEN Jian
1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China 3 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaQIN Yong
1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China 3 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaWANG Geoff
4 School of Chemical Engineering, The University of Queensland, Brisbane St Lucia 4072, Queensland, AustraliaXU Ke
5 PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, ChinaLI Guozhang
3 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaLI Chao
3 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaThe authors would like to thank the financial support from the National Natural Science Foundation of China (41702130, 41872171 and 41672146), National Science and Technology Major Project (2016ZX05066), and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
The Upper Shihezi sedimentary rocks in the Linxing region has been estimated with a significant volume of tight sandstone gas. However, lateral distribution of the present-day stress magnitude is poorly understood, which limits further gas production. Hence, a one-dimensional mechanical earth model and a three-dimensional heterogeneous geomechanical model are built to address this issue. The results indicate that the strike-slip stress regime is dominant in the Upper Shihezi Formation. Relatively low stresses are mainly located around wells L-60, L-22, L-40, L-90, etc, and stress distributions exhibit the similarity in the Members H2 and H4. The differential stresses are relatively low in the Upper Shihezi Formation, suggesting that complex hydraulic fracture networks may be produced. Natural fractures in the Upper Shihezi Formation contribute little to the overall gas production in the Linxing region. In addition, the minimum principal stress gradient increases with Young’s modulus, suggesting that the stiffer rocks commonly convey higher stress magnitudes. There is a strong interplay between stress distribution and heterogeneity in rock mechanics. Overall, the relative error between the predicted and measured results is less than 10%, implying that the predicted stress distribution is reliable and can be used for subsequent analysis in the Linxing region.
JU Wei, SHEN Jian, QIN Yong, WANG Geoff, XU Ke, LI Guozhang, LI Chao.2021. Stress Distribution in the Upper Shihezi Formation from 1D Mechanical Earth Model and 3D Heterogeneous Geomechanical Model, Linxing Region, Eastern Ordos Basin, Central China[J]. Acta Geologica Sinica(),95(3):976-987
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