摘要
页岩气作为补充天然气资源缺口的非常规资源,在我国乃至世界能源供应中占有重要地位。本文结合中国地质调查局在宜昌地区部署的3口页岩勘探井,应用水压致裂法、ASR非弹性应变恢复法和钻孔诱发张裂缝分析法展开了针对该地区古老地层的深部地应力实测工作,得出以下认识:(1)研究区在一定深度范围内最大水平主应力,最小水平主应力,铅垂应力均随深度增加而线性增大(2)研究区水平应力差异系数随深度的增加呈近似幂指数变小,深度在1500m及以下时研究区水平应力差异系数拟合结果小于0.25。(3)研究区深部最大水平主应力方向主要以NE向50~75为主,仙女山断层和天阳坪断层呈现左旋走滑兼逆冲特征。(4)水平应力梯度和水平应力差异系数综合反映出该区深部应力积累较小,构造活动较弱,有利于页岩储层发育。
Shale gas,as an unconventional resource to supplement the gap of natural gas resources,plays an important role in the energy supply of China and even the world.This paper combined the Chinese Geological Survey deploymented in the Yichang area of 3 shale exploration applicating in-situ stress measurement by hydraulic fracturing measurement,ASR in-situ measurement,imaging logging analysis basing on the well drilling,come to the following understanding:(1)The maximum horizontal principal stress,the minimum horizontal principal stress and the vertical stress all increase linearly with the increase of depth(2)With the increase of depth,the coefficient of horizontal stress difference in the study area decreases exponentially.When the depth is 1500m or less,the fitting result of the coefficient of horizontal stress difference in the study area is less than 0.25.(3)The maximum horizontal principal stress direction in the deep part of the study area is mainly from 50°to 75°in NE direction,and the Xiannushan Fault and TIANYANGPING fault are characterized by sinistral strike slip and thrust.(4)The horizontal stress gradient and horizontal stress difference coefficient reflect that the deep stress accumulation is small and the tectonic activity is weak,which is beneficial to the development of shale reservoir.
作者
王连山
孙东生
邱君
陈昊
宋腾
Wang Lianshan;Sun Dongsheng;Qiu Jun;Chen Hao;Song Teng(First Crust Deformation Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Oil&Gas Survey,China Geolodical Surve,Beijing,100083,China)
出处
《现代科学仪器》
2020年第1期74-78,共5页
Modern Scientific Instruments
基金
中国地震局地震监测、预报、科研三结合课题(编号:3JH-202001106)
中国地震局第一监测中心科技创新主任基金(编号:FMC2018009)
中国地震局震情跟踪定向工作任务课题(编号:2020010228)联合资助.
关键词
页岩气
地应力状态
水压致裂
ASR
shale gas
in-situ stress field
hydraulic fracturing
ASR
