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Geomechanical Analysis for Deep Shale Gas Exploration Wells in the NDNR Blocks, Sichuan Basin, Southwest China

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  • Majia Zheng

    (School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Hongming Tang

    (School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Hu Li

    (School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Jian Zheng

    (PetroChina Southwest Oil and Gasfield Company, Chengdu 610000, China)

  • Cui Jing

    (PetroChina Southwest Oil and Gasfield Company, Chengdu 610000, China)

Abstract

The abundant reserve of shale gas in Sichuan Basin has become a significant natural gas component in China. To achieve efficient development of shale gas, it is necessary to analyze the stress state, pore pressure, and reservoir mechanical properties such that an accurate geomechanical model can be established. In this paper, Six wells of Neijiang-Dazu and North Rongchang (NDNR) Block were thoroughly investigated to establish the geomechanical model for the study area. The well log analysis was performed to derive the in-situ stresses and pore pressure while the stress polygon was applied to constrain the value of the maximum horizontal principal stress. Image and caliper data, mini-frac test and laboratory rock mechanics test results were used to calibrate the geomechanical model. The model was further validated by comparing the model prediction against the actual wellbore failure observed in the field. It was found that it is associated with the strike-slip (SS) stress regime; the orientation of S Hmax was inferred to be 106–130° N. The pore pressure appears to be approximately hydrostatic from the surface to 1000 m true vertical depth (TVD), but then becomes over-pressured from the Xujiahe formation. The geomechanical model can provide guidance for the subsequent drilling and completion in this area and be used to effectively avoid complex drilling events such as collapse, kick, and lost circulation (mud losses) along the entire well. Also, the in-situ stress and pore pressure database can be used to analyze wellbore stability issues as well as help design hydraulic fracturing operations.

Suggested Citation

  • Majia Zheng & Hongming Tang & Hu Li & Jian Zheng & Cui Jing, 2020. "Geomechanical Analysis for Deep Shale Gas Exploration Wells in the NDNR Blocks, Sichuan Basin, Southwest China," Energies, MDPI, vol. 13(5), pages 1-24, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1117-:d:327378
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    Cited by:

    1. Haitao Gao & Peng Cheng & Wei Wu & Shenyang Liu & Chao Luo & Tengfei Li & Kesu Zhong & Hui Tian, 2022. "Pore Water and Its Influences on the Nanopore Structures of Deep Longmaxi Shales in the Luzhou Block of the Southern Sichuan Basin, China," Energies, MDPI, vol. 15(11), pages 1-20, May.
    2. Golam Muktadir & Moh’d Amro & Nicolai Kummer & Carsten Freese & Khizar Abid, 2021. "Application of X-ray Diffraction (XRD) and Rock–Eval Analysis for the Evaluation of Middle Eastern Petroleum Source Rock," Energies, MDPI, vol. 14(20), pages 1-16, October.

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