沁水盆地郑庄区块地应力发育特征及其地质意义

发布时间：2018-05-01 09:15

本文选题：郑庄区块 + 地应力场　；参考：《煤炭科学技术》2017年10期

【摘要】：为研究地应力对煤层气开发的影响,基于水压致裂地应力测量方法,结合煤层气井试井、测井和水力压裂三维微地震监测资料,研究了郑庄区块16井次21层目的层段原位地应力发育规律。结果表明:(1)地应力场为典型的构造应力场类型,浅部以逆断层和走滑断层应力机制组合类型为主,深部以正断层和走滑断层应力机制组合类型为主;(2)最大和最小水平主应力及垂向应力随埋深均呈线性增加趋势;(3)侧压系数位于Hoek-Brown包络线内,随埋深增加而降低且变化幅度逐步缩小;(4)最大水平主应力方位为NE-NEE向。一方面,现今地应力场方位与断裂构造产状的叠加影响了煤层气富集;另一方面,地应力增加导致渗透率呈指数式降低,而储层压力呈线性增加;2方面作用对煤层气高效开发产生了显著影响。
[Abstract]:In order to study the effect of in-situ stress on coalbed methane development, based on the method of hydrofracturing, well testing, logging and hydraulic fracturing, 3D microseismic monitoring data of coalbed methane wells are combined. The in-situ stress development in the target zone of 16 wells and 21 layers in Zhengzhuang block is studied. The results show that the in-situ stress field is a typical type of tectonic stress field, and the shallow part is dominated by the combination of the stress mechanism of the reverse fault and the strike-slip fault. The maximum and minimum horizontal principal stress and vertical stress show a linear increasing trend with buried depth in depth, and the lateral pressure coefficient is located in the Hoek-Brown envelope line, which is the main type of stress mechanism combination of normal fault and strike-slip fault. The maximum horizontal principal stress azimuth is NE-NEE direction. On the one hand, the superposition of the azimuth of geostress field and the occurrence of fault structure affects the coalbed methane enrichment, on the other hand, the increase of in-situ stress results in an exponential decrease of permeability. The reservoir pressure increases linearly and has a significant effect on the high efficiency development of coalbed methane.
【作者单位】：中国矿业大学煤层气资源与成藏过程教育部重点实验室;中国石油华北油田公司;
【基金】：国家自然科学基金资助项目(41672149) 国家科技重大专项资助项目(2016ZX05066001-004)
【分类号】：P631;TE37

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