太原西山煤田现代构造应力场综合模拟

doi:10.7623/syxb201511008

石油学报 ›› 2015, Vol. 36 ›› Issue (11): 1392-1401.DOI: 10.7623/syxb201511008

太原西山煤田现代构造应力场综合模拟

韩贝贝^1,2, 秦勇¹, 张志军¹, 尹诗³, 汪岗¹, 郑书洁¹

1. 中国矿业大学资源与地球科学学院江苏徐州 221008;
2. 中化地质矿山总局北京 100013;
3. 中国煤炭地质总局航测遥感局陕西西安 710100

收稿日期:2015-05-13 修回日期:2015-08-20 出版日期:2015-11-25 发布日期:2015-12-05
通讯作者: 秦勇,男,1957年6月生,1981年获焦作矿业学院学士学位,1992年获中国矿业大学博士学位,现为中国矿业大学副校长、教授、博士生导师,主要从事煤层气地质与地球化学研究。Email:yongqin@cumt.edu.cn
作者简介:韩贝贝,女,1989年4月生,2012年获中国地质大学(武汉)学士学位,2015年获中国矿业大学硕士学位,主要研究方向为煤层气地质。Email:hanbeibeizyxy@126.com
基金资助:
国家重大科技专项(2011ZX05034)资助。

Comprehensive simulation on modern tectonic stress field of Xishan coalfield in Taiyuan

Han Beibei^1,2, Qin Yong¹, Zhang Zhijun¹, Yin Shi³, Wang Gang¹, Zheng Shujie¹

1. School of Resource and Geoscience, China University of Mining and Technology, Jiangsu Xuzhou 221008, China;
2. China chemical Geology and Mine Beieau 100013, China;
3. Aerophotogrammetry and Remote Sensing Bereau of China Coal Geology, Shanxi Xi'an 710100

Received:2015-05-13 Revised:2015-08-20 Online:2015-11-25 Published:2015-12-05

摘要/Abstract

摘要：

根据震源机制解分析得出太原西山煤田的区域构造应力场特征,在此基础上,基于有限元分析法对煤田内部2号和8号煤层的地应力分布进行了模拟,并结合煤层水力压裂资料获得验证。综合分析结果显示:与山西地堑系的构造背景一致,西山煤田的构造作用以NW-NNW向的近水平拉张作用为主;2号煤层和8号煤层的地应力分布趋势基本一致,均由四周向内部逐渐增大,2号煤层的水平地应力值介于12.4~39.4 MPa,8号煤层的地应力值介于12.6~38.3 MPa,与水力压裂测量结果的相对误差小于20%,受煤层埋深的影响,8号煤层的地应力整体上高于2号煤层;相同地质构造背景的约束下,两个煤层的应力方向分布基本一致,主应力(拉张力)的方向均以NW和NNW向为主,与水力压裂测量和震源机制解结果基本吻合。拉张构造应力作用下,有利于煤层裂隙的形成和渗透率的提高,但易造成煤层气的散失,因此在煤层气开采过程中应着重寻找有利储集区块。

关键词: 西山煤田, 应力场, 震源机制解, 有限元模拟, 水力压裂

Abstract:

The regional tectonic stress field of Xishan coalfield was obtained according to focal mechanism solutions. On this basis, the geo-stress distribution of Coal Seam 2 and Coal Seam 8 was simulated through finite element analysis and verified by coal-seam hydraulic fracturing data. Comprehensive analysis results have indicated that the tectonism of Xishan coalfield is dominated by NW-NNW approximate horizontal tension effect, which is consistent with the tectonic settings of Shanxi graben system; the geo-stress distribution trend of Coal Seam 2 was basically consistent with that of Coal Seam 8, where both stresses were increased inwards from the periphery. The horizontal geo-stress values of Coal Seam 2 and Coal Seam 8 are ranged in 12.4-39.4 MPa and 12.6-38.3 MPa respectively. These values have relative deviations less than 20% against hydraulic fracturing measurements. Influenced by the burial depth of coal seam, the geo-stress of Coal Seam 8 is overall higher than that of Coal Seam 2. Constrained by the same tectonic settings, the distribution of both stress directions is basically the same. Moreover, the directions of both principle stresses (tensions) are dominated by NW and NNW respectively, basically identical to the hydraulic fracturing measurements and focal mechanism solutions. The tensile stress effect is able to promote the generation of coal-seam fissures and improve the permeability, but prone to the loss of coalbed methane. Therefore, the focus should be put on finding favorable reservoir blocks in the exploration process of CBM.

Key words: Xishan coalfield, stress field, focal mechanism solutions, finite element analysis, hydraulic fracturing

中图分类号:

TE121

韩贝贝, 秦勇, 张志军, 尹诗, 汪岗, 郑书洁. 太原西山煤田现代构造应力场综合模拟[J]. 石油学报, 2015, 36(11): 1392-1401.

Han Beibei, Qin Yong, Zhang Zhijun, Yin Shi, Wang Gang, Zheng Shujie. Comprehensive simulation on modern tectonic stress field of Xishan coalfield in Taiyuan[J]. Acta Petrolei Sinica, 2015, 36(11): 1392-1401.

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太原西山煤田现代构造应力场综合模拟

Comprehensive simulation on modern tectonic stress field of Xishan coalfield in Taiyuan

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