ABAQUS中不同断层带的煤层地应力场反演  

Influence of Different Fault Treatment Modes on Simulation Result of In-Situ Stress Distribution in Coalbed Using ABAQUS

作　　者：孔鹏[1] 任广聪 薄海江 马新仿[2] 刘羽欣[1] 高海滨[4] KONG Peng;REN Guangcong;BO Haijiang;MA Xinfang;LIU Yuxin;GAO Haibin(Coalbed Methane Research Centre,China United Coalbed Methane Corporation,Taiyuan,Shanxi 030000,China;College of Petroleum Engineering,China University of Petroleum (Beijing),Beijing 102249,China;Oilfield Production Division,China Oilfield Services Limited,Tianjin 300000,China;Jincheng Branch,China United Coalbed Methane Corporation,Jincheng,Shanxi 048000,China)

机构地区：[1]中联煤层气有限责任公司煤层气研发中心,山西太原030000 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中海油田服务股份有限公司油田生产事业部,天津300000 [4]中联煤层气有限责任公司晋城分公司,山西晋城048000

出　　处：《西安石油大学学报（自然科学版）》2022年第3期1-8,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：“十三五”国家科技重大专项课题“煤层高效增产改造技术”(2017ZX05064003)。

摘　　要：对断层带的处理方式不同,会引起沁水盆地柿庄南区块地应力分布计算结果的差异,为研究断层带的不同处理方式带来的影响,基于柿庄南区块实际地质参数,使用ABAQUS有限元分析软件分别建立单一性质断层带、过渡断层带、粘结单元断层带的煤层有限元数值模型,通过对工区施加载荷平衡地应力的方法计算地应力大小和方向分布,并对比2口实际井的地应力参数来确定计算结果精确度。研究结果表明:目标井well 1过渡断层带的计算水平应力差误差最小,为0.12 MPa,粘结单元断层带次之,为0.25 MPa,单一断层带的计算水平应力差值误差最大,为0.34 MPa;目标井well 2单一断层带的计算水平应力差误差最小,为0.35 MPa,粘结单元断层带次之,为0.38 MPa,过渡断层带的计算水平应力差值误差最大,为0.49 MPa。well 1和well2的粘结单元计算水平应力方向最准确,单一断层带次之,过渡断层带的计算水平应力方向偏差最大。使用ABAQUS有限元软件计算煤层地应力分布时,同时应考虑地应力大小和方向误差,将断层视为裂隙,通过粘结单元建立断层模型,计算结果更为准确。Different treatment methods of fault zones will lead to different calculation results of in-situ stress distribution in Shizhuang south block of Qinshui Basin.In order to study the influence of different fault zone treatment methods on simulation result of in-situ stress distribution,based on the actual geological parameters of Shizhuang south block,the finite element numerical models of coal seams with single fault zone,transition fault zone and bonding element fault zone are established by using ABAQUS finite element analysis software,the magnitude and direction distributions of in-situ stress are calculated by applying load to balance in-situ stress in the work area,and the in-situ stress parameters of two actual wells are compared to determine the accuracy of the calculation results.The results show that the error of the calculated horizontal stress difference in the transition fault zone of well 1 is the smallest,which is 0.12 MPa,followed by the cohesive element fault zone,which is 0.25 MPa,and the error of the calculated horizontal stress difference in single fault zone is the largest,which is 0.34 MPa;The error of the calculated horizontal stress difference in the single fault zone of well 2 is the smallest,which is 0.35 MPa,followed by the cohesive element fault zone,which is 0.38 MPa,and the error of the calculated horizontal stress difference in transition fault zone is the largest,which is 0.49 MPa.The cohesive element fault zones of well 1 and well 2 are the most accurate in calculating the horizontal stress direction,followed by single fault zone,and the deviation of the calculated horizontal stress direction in the transition fault zone is the largest.Therefore,when using ABAQUS finite element software to calculate the in-situ stress distribution of coal seam,the magnitude and direction error of in-situ stress should be considered at the same time.The fault is regarded as a fracture,and the fault model is established through cohesive element,so the calculation result is more accurate.

关 键 词：地应力分布 断层带 粘结单元 水平应力差 水平应力方向 

分 类 号：TE319[石油与天然气工程—油气田开发工程]