库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约

李鑫; 魏永恒; 王文峰; 琚宜文; 田继军; 吴斌; 冯烁

doi:10.13568/j.cnki.651094.651316.2022.01.15.0001

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库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约

生态·资源·环境 | 更新时间：2026-01-21

- 库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约
- 库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约
- 新疆大学学报（自然科学版中英文） 2022年39卷第6期页码：727-735
- 作者机构：
  
  1. 新疆大学新疆中亚造山带大陆动力学与成矿预测自治区重点实验室
  2. 中国科学院计算地球动力学重点实验室
  3. 中国科学院大学地球与行星科学学院
  4. 新疆维吾尔自治区煤田地质局一六一地质勘探队
- 作者简介：
- 基金信息：
  
  国家自然科学基金（42002188;U1903303;41872160）;新疆维吾尔自治区高校科研计划（XJEDU2019Y010）
- DOI：10.13568/j.cnki.651094.651316.2022.01.15.0001
  中图分类号： P618.13
- 纸质出版：2022
- 稿件说明：
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[1]李鑫,魏永恒,王文峰,等.库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约[J].新疆大学学报(自然科学版)(中英文),2022,39(06):727-735+746.
[1]李鑫,魏永恒,王文峰,等.库拜煤田阿艾矿区煤储层地应力特征及其对储层物性的制约[J].新疆大学学报(自然科学版)(中英文),2022,39(06):727-735+746. DOI： 10.13568/j.cnki.651094.651316.2022.01.15.0001.

DOI：10.13568/j.cnki.651094.651316.2022.01.15.0001.

摘要

地应力是影响煤层气高效开发的关键因素之一．基于南天山山前挠曲盆地库车坳陷阿艾矿区的多套煤层气储层注入/压降试井、原地应力测试、吸附气含量测试等数据以及库车坳陷构造演化史分析，阐明了阿艾矿区煤储层地应力分布特征及其对储层物性的制约，探讨了挠曲盆地构造演化对煤储层地应力的制约作用．结果表明：(1)阿艾矿区垂向上煤储层埋深处于350～500 m、500～900 m和900～1 200 m时，地应力状态类型依次为σH>σv>σh、σH≈σv>σh和σv>σH>σh;(2)埋深900 m处既是垂直主应力和最大水平主应力的转换点，也是渗透率趋势变化点，暗示了储层地应力对渗透率的制约作用．阿艾矿区吸附气含量临界深度在900～1 000 m;(3)喜山期的构造挤压及逆冲推覆将浅部(埋深<500 m)碎裂煤储层裂隙压实闭合，使其渗透率降低．受浅部逆冲推覆影响，中深部(埋深500～1 200 m)煤储层古NS向构造挤压应力部分释放后渗透率回弹，再加上含气性较好，总体有利于煤层气开发；(4)阿艾矿区南部比尤勒包谷孜背斜煤储层地应力小于中部夏阔坦向斜水平主应力，导致比尤勒包谷孜背斜煤储层渗透率大于夏阔坦向斜煤储层渗透率，相对更利于煤层气开发．

Abstract

In-suit stress is one of the key factors determining the success or failure of coal bed methane(CBM)development. Based on the data of well tests

in-situ stress tests

and adsorbed gas content tests of multiple coal reservoirs of the A'ai Mining Area locating in the Kuqa Depression of the piedmont flexural basin southern Tianshan Mountain

stress distribution of the A'ai Mining Area and its constrains on physical properties of coal reservoir were clarified

and the constraints of tectonic evolution of flexure basin on in-situ stress of coal reservoir were discussed. The results showed:(1) The in-situ stress state types are σH >σv >σh

σH ≈ σv >σh and σv >σH >σh when the reservoir depth is 350～500 m

500～900 m and 900～1 200 m

respectively;(2) The depth of 900 m is not only the conversion point of the vertical principal stress and the maximum horizontal principal stress

but also the transition point of permeability trend

suggesting the control effect of in-situ stress on permeability

the critical depth of adsorbed gas conversion of the A'ai Mining Area was 900～1 000 m;(3) The fractures of the shallow(buried depth<500 m) coal reservoir were compacted and closed by structural compression and thrust nappe during Himalayan period

which reduced the permeability. Influenced by the shallow thrust nappe

the NS directional compressive stress of the middle and deep(buried depth of 500～1 200 m) coals with relative higher gas capacities released partly

leading to the permeability rebound

thus the middle and deep coals were generally conducive to the development of CBM;(4) The coal reservoir stress of the Biyoulebaoguzi compound anticline in the south of the A'ai Mining Area was less than that of the Xiakuotan syncline in the middle

resulting in the permeability of former was greater than that of the latter. Hence the Biyoulebaoguzi compound anticline was relatively more conducive to the development of CBM.

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