低阻碳酸盐岩储层双侧向裂缝响应模拟及定量评价  

Simulation and Quantitative Evaluation of Dual-laterolog Response of Fracture in Low-resistivity Carbonate Reservoir

作　　者：南泽宇[1] 李军[1] 贾丽华[1] 刘志远[1] 郝士博 

机构地区：[1]中国石化股份有限公司石油勘探开发研究院,北京100083

出　　处：《地球物理学进展》2014年第5期2224-2230,共7页Progress in Geophysics

基　　金：国家专项海相碳酸盐岩油气层识别技术(2011ZX05005-006-006);碳酸盐岩缝洞型储层测井评价及井震响应研究(2011ZX05014-001-001);中石化科技部叙利亚低阻裂缝生物灰岩储层测井评价研究(P12054)联合资助

摘　　要：低阻碳酸盐岩储层如叙利亚生物灰岩储层基岩电阻率可低至1-5Ωm,低电阻率碳酸盐岩中裂缝定量评价困难,传统的高阻基岩中裂缝评价方法适用性有限.本文利用三维有限元法精确模拟不同裂缝参数下的双侧向测井响应特征,总结了裂缝型低阻碳酸盐岩储层双侧向测井响应的特有规律,提出适合于低阻碳酸盐岩的裂缝参数评价初始模型.然后用成像资料提供的裂缝参数对其进行刻度,建立成像资料控制的双侧向裂缝参数定量评价方法.在研究区裂缝参数评价中,双侧向计算的裂缝参数与成像解释裂缝参数吻合较好,证明该方法可以有效应用于以低阻碳酸盐岩为储层的油气藏裂缝参数评价,成为裂缝定量评价的重要手段.Fracture identification and parameter evaluation are important for logging interpretation of fractured reservoir,especially fracture evaluation from conventional logs in the absence of imaging log.The resistivity of carbonate reservoir such as biogenic limestone reservoir in Syria could be as low as 1-5 Ω m.Because of the low contrast of fracture resistivity and surrounding rock resistivity,fracture parameters of lowresistivity carbonate reservoir are difficult to evaluate,and the traditional fracture evaluation method is only applicable to highresistivity surrounding rock reservoirs.In order to evaluate fracture parameters of this kind of reservoir, ThreeDimensional Finite Element Method（3D FEM）models with various fracture parameters such as fracture width,fracture angle,fracture resistivity and basic rock resistivity have been set up according to the property of fractured carbonate reservoir.Dual-laterolog response characteristics of these 3D FEM models is calculated according to boundary conditions and control equations,and then the unique dual-laterolog response rules of fractured low-resistivity carbonate reservoir is summarized.Based on these rules a raw fracture parameter calculation model which could be used to evaluate fracture width and fracture porosity for low-resistivity carbonate reservoir is proposed.Finally fracture parameters gained from imaging logging data are used to calibrate this model to establish fracture parameter calculate method controlled by imaging logging.In the evaluation of fracture parameters of the study area,the fracture parameters calculated by dual-laterolog is good coincident with the fracture parameters interpreted by imaging log,which proves that this method could be effectively applied to fracture evaluation for the low-resistivity carbonate reservoirs,and this method could be an important means of fracture quantitative evaluation method.

关 键 词：裂缝参数 低阻碳酸盐岩 双侧向 三维有限元 

分 类 号：P631[天文地球—地质矿产勘探]