太原西山区块煤储层地应力分布特征及评价

发布时间：2018-01-26 18:34

本文关键词： 太原西山区块地应力水力压裂　出处：《煤田地质与勘探》2017年03期 　论文类型：期刊论文

【摘要】：地应力是影响煤层气开发的关键参数,为了分析太原西山区块煤储层地应力条件,为煤层气勘探开发提供理论依据,采用水力压裂法测量地应力,统计了太原西山区块35口井煤储层地应力资料,获取二叠系山西组2号煤储层地应力与煤层埋深之间的相关关系,阐明了现今地应力分布特征。结果表明,研究区山西组2号煤层破裂压力梯度、闭合压力梯度和煤储层压力梯度的平均值分别为4.77 MPa/hm、2.82 MPa/hm和0.6 MPa/hm;2号煤层最小水平主应力梯度、最大水平主应力梯度和垂直主应力梯度的平均值分别为2.82 MPa/hm、3.24 MPa/hm和2.7 MPa/hm。主应力均随煤层埋深增加呈线性规律增高。根据最小水平主应力的大小,将研究区划分为低应力区、中应力区、高应力区3个区。
[Abstract]:Ground stress is the key parameter that affects the development of coalbed methane. In order to analyze the stress condition of block coal reservoir and provide theoretical basis for the exploration and development of coalbed methane, hydraulic fracturing method is used to measure the in-situ stress. In this paper, the in-situ stress data of 35 wells in Xishan block of Taiyuan are analyzed, the correlation between the in-situ stress of No. 2 coal reservoir in Shanxi formation of Permian system and the buried depth of coal seam is obtained, and the distribution characteristics of in-situ stress are clarified. The average values of fracture pressure gradient, closed pressure gradient and coal reservoir pressure gradient are 4.77 MPa/hm respectively. 2.82 MPa/hm and 0.6 MPA / hm; The average values of minimum horizontal principal stress gradient, maximum horizontal principal stress gradient and vertical principal stress gradient are 2.82 MPa/hm respectively. 3.24 MPa/hm and 2.7 MPA / hm. the principal stress increases linearly with the increase of coal seam depth. According to the minimum horizontal principal stress, the study area is divided into low stress area. The middle stress zone and the high stress zone are 3 regions.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;
【基金】：国家自然科学基金项目(41372163) 山西省煤层气联合研究基金资助项目(2014012001) 中国矿业大学(北京)大学生创新训练项目(C201602037)~~
【分类号】：TE271
【正文快照】： Foundation item:National Natural Science Foundation of China(41372163);Shanxi Provincial Basic Research Program-Coalbed Methane JointResearch Foundation(2014012001);College Students’Innovative Training Program of China University of Mining and Technol-o

【相似文献】