摘要
地应力是盐穴储气库钻完井设计、运行压力设计等方面的重要基础数据,同时在储气库安全运行、经营管理等方面具有非常重要的意义。宁晋石盐田盐岩平均埋深超过2700 m,而国际上基于超深盐岩地应力的研究鲜有报道,这使宁晋盐穴储气库造腔层段地应力的测定面临很大的技术挑战。文章主要以水压致裂法(HF)和声发射试验(AE)两种测试方法为主,对比已有的区域构造应力测试结果,基于Z1资料井对研究区盐系地层地应力分布特征进行综合分析,研究表明:(1)Z1井盐系地层水平最大主应力方向总体表现为近东西向;(2)Z1井盐系地层地应力整体上随深度增大,水平最大主应力为51.9~60.0 MPa,水平最小主应力为43.2~53.7 MPa,垂向最大应力为65.7 MPa;(3)Z1井盐系地层地应结构总体表现为S_(V)>S_(H)>S_(h),垂向应力为最大主应力,区域应力状态属于正断层应力环境。
Ground stress is an important basic data for drilling and completion design,operating pressure design,and other aspects of salt cavern gas storage.It is also of great significance in the safe operation,management,and other aspects of gas storage.The average burial depth of salt rock in Ningjin Shi Salt Field exceeds 2700 meters,and there are few reports on research based on ultra deep salt rock in-situ stress internationally,which poses a great technical challenge to the measurement of in-situ stress in the cavity section of Ningjin Salt Cave Gas Storage.This article mainly uses two testing methods,hydraulic fracturing method(HF)and acoustic emission test(AE),to compare the existing regional tectonic stress testing results.Based on the Z1 data well,a comprehensive analysis of the distribution characteristics of ground stress in the salt strata of the study area is conducted.The study shows that:(1)The overall direction of the maximum horizontal principal stress in the salt strata of the Z1 well is nearly east-west.(2)The overall geostress of the salt bearing strata in Well Z1 increases with depth,with the maximum horizontal principal stress ranging from 51.9 to 60.0 MPa,the minimum horizontal principal stress ranging from 43.2 to 53.7 MPa,and the maximum vertical stress ranging from 65.7 MPa.(3)The overall geological stress structure of the salt bearing strata in Well Z1 is S_(V)>S_(H)>S_(h),with the vertical stress being the maximum principal stress.The regional stress state belongs to the normal fault stress environment.
作者
侯秉仁
牛耀辉
上官拴通
苏野
王续学
杨哲
HOU Bingren;NIU Yaohui;SHANGGUAN Shuantong;SU Ye;WANG Xuxue;YANG Zhe(Hebei Natural Gas Company Limited,Shijiazhuang 050000,China;No.2 Exploration Team,Hebei Bureau of Coal Geological Exploration(Hebei Province Hot Dry Rock Research Center),Xingtai 054000,China;Hebei Coal Mine Geological Exploration Institute,Xingtai 054000,China)
出处
《盐科学与化工》
CAS
2024年第4期5-8,13,共5页
Journal of Salt Science and Chemical Industry
基金
河北省重点研发计划项目“宁晋超深盐穴储气库建设关键技术研究与应用”(21374101D)。
关键词
盐穴储气库
超深盐岩
地应力测量
Salt cavern gas storage
Ultradeep salt rock
Geostress measurement
作者简介
侯秉仁(1973—),男,河北石家庄人,本科,高级工程师,研究方向为油气储运及地下空间综合利用;通讯作者:牛耀辉,hbmtedqdzx@126.com。
