煤层气储层远井带应力动态变化定量表征

doi:10.3799/dqkx.2026.150

煤层气储层远井带应力动态变化定量表征

doi: 10.3799/dqkx.2026.150

1. 中国地质大学(武汉）资源学院, 湖北武汉 430074;
2. 新疆维吾尔自治区地质局煤田地质中心, 新疆乌鲁木齐 830099;
3. 中煤科工集团武汉设计研究院有限公司湖北武汉 430064;
4. 煤与煤层气共采全国重点实验室山西晋城 048000

基金项目:

国家自然科学基金项目(42072204)

山西省煤基低碳联合基金重点项目(U1910204)

煤与煤层气共采全国重点实验室开放基金项目(2024KF02)

新疆维吾尔自治区地质局科技创新团队项目(XJGBST202626)。

详细信息

作者简介:
李国庆(1980-),男,博士,副教授,主要从事非常规油气地质、矿井地质教学与科研。ORCID:0000-0002-3463-6715.E-mail:ligq@cug.edu.cn

中图分类号: P618、TE122
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出版历程
- 收稿日期: 2025-09-28
- 网络出版日期: 2026-06-29

A Preliminary Study on Quantitative Characterization of Stress Variation in the Far-Well Zone of Coalbed Methane Reservoirs

1. School of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China;
2. Coal Geology Center, Xinjiang Uygur Autonomous Region Bureau of Geology, Urumqi 830099, China;
3. Wuhan Design & Research Institute Co. Ltd. of China Coal Technology & Engineering Group, Wuhan 430064, China;
4. State Key Laboratory of Coal and CBM Co-Mining, Jincheng, Shanxi 048000, China

摘要

摘要: 应力是煤层气安全高效开发的关键影响因素之一，而目前针对煤层气储层应力大小、应力机制动态以及有效应力拐点定量表征的研究报道少见。应用弹性理论，基于单轴应变、垂向荷载不变假设，考虑甲烷解吸引起的弹性模量变化，建立远井带煤层气储层应力动态数学模型，推导水平有效主应力-储层压力曲线拐点处的储层压力解析解，探讨了远井带储层有效主应力大小及应力机制的变化规律。结果表明，远井带储层垂直有效主应力在排采过程中持续增加；水平有效主应力在排水阶段单调增加，在采气阶段先增加后减小；初始正断层应力机制始终保持不变，而初始走滑断层、初始逆断层应力机制分别有3种、6种可能的演化模式：(I排水阶段)走滑-(II产气阶段)走滑、走滑-(走滑-正)、(走滑-正)-正；逆-逆、逆-(逆-走滑)、逆-(逆-走滑-正)、(逆-走滑)-走滑、(逆-走滑)-(走滑-正)、(逆-走滑-正)-正。深部储层主应力差、渗透性随排采呈增大趋势；浅部逆断层应力机制储层可通过二次压裂改善其渗透性。研究认识可为储层稳定性分析、生产动态预测及开发方案优化提供借鉴。
- 煤层气 /
- 储层应力 /
- 应力机制 /
- 远井带 /
- 排采
Abstract: Stress is one of the key factors that influence the safe and efficient development of coalbed methane (CBM). However, there are currently limited reports on the variation of CBM reservoir stress magnitude and stress regime, and the quantitative characterization of the inflection point of effective stress. Applying elasticity theory, based on the assumption of uniaxial strain and considering the variations in elastic modulus caused by methane desorption, a mathematical model of stress variation of CBM reservoir far from the borehole was established, the analytical solution for reservoir pressure at the inflection point of the horizontal effective principal stress vs reservoir pressure curve was derived, and the variations in the magnitude and stress regime of the effective principal stress of reservoir far from a CBM well during reservoir pressure depletion were analyzed. The results indicate that, during reservoir pressure depletion, for the CBM reservoir where is affected by gas well drainage but not adjacent to the gas well, the vertical effective principal stress continues to rise; the horizontal effective principal stress rises monotonically during the dewatering only stage and first rises then declines during the gas production stage. During the reservoir pressure depletion, the initial normal faulting stress regime of the reservoir remains unchanged; there are three and six possible evolution modes for the initial strike-slip and reverse faulting stress regimes: from strike-slip (in the dewatering stage) to strike- slip (in the gas production stage), strike-slip-(strike-slip- normal), (strike slip-normal) to normal; reverse-reverse, reverse-(reverse-strike slip), reverse-(reverse-strike slip-normal), (reverse-strike slip)-strike slip, (reverse-strike slip) -(strike slip-normal), (reverse-strike slip-normal)-normal. For the deep CBM reservoir, with the depletion of reservoir, there is an increasing trend of principal stress difference and reservoir permeability; for the shallow reservoir in a reverse faulting stress regime, second hydraulic fracturing can be used to improve the reservoir permeability. The research outcomes can provide reference for reservoir stability analysis, production performance prediction, and development plan optimization.
- coalbed methane /
- reservoir stress /
- stress regime /
- far-well zone /
- drainage and production

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参考文献(51)

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煤层气储层远井带应力动态变化定量表征

doi: 10.3799/dqkx.2026.150

作者简介:
李国庆(1980-),男,博士,副教授,主要从事非常规油气地质、矿井地质教学与科研。ORCID:0000-0002-3463-6715.E-mail:ligq@cug.edu.cn

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A Preliminary Study on Quantitative Characterization of Stress Variation in the Far-Well Zone of Coalbed Methane Reservoirs

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目录

留言板

煤层气储层远井带应力动态变化定量表征

doi: 10.3799/dqkx.2026.150

作者简介: 李国庆(1980-),男,博士,副教授,主要从事非常规油气地质、矿井地质教学与科研。ORCID:0000-0002-3463-6715.E-mail:ligq@cug.edu.cn

计量

出版历程

A Preliminary Study on Quantitative Characterization of Stress Variation in the Far-Well Zone of Coalbed Methane Reservoirs

计量

出版历程

目录

作者简介:
李国庆(1980-),男,博士,副教授,主要从事非常规油气地质、矿井地质教学与科研。ORCID:0000-0002-3463-6715.E-mail:ligq@cug.edu.cn