【摘要】 断层裂缝定量描述技术(简称VSD技术)是针对构造平缓区致密储层内部与断层相关裂缝定量预测的新方法。将该方法应用于塔中X井区良里塔格组(O3l)的断层裂缝研究中,以过井地震剖面断层构造的VSD计算为例,指出该技术主要包括运用断面脱空原理进行裂缝系统的定性识别和对存在脱空空间的断层构造开展VSD定量计算两部分,后者由构造建模、地层建模、裂缝孔隙度约束及VSD计算4个步骤组成。在过井VSD计算结果得到岩心、钻井、测井资料验证基础之上,对全区断层构造逐一开展VSD计算,得到良里塔格组最大裂缝孔隙度平面分布图,揭示研究区主要发育7个规模较大的裂缝系统,其发育分布与断裂系统紧密相关,但并无一一对应关系。有效裂缝是否发育主要受控于断层作用过程中是否产生断面脱空空间:如果产生,则裂缝系统发育;反之则不发育。更多还原

【Abstract】 Void Space Description(VSD) is a new method for quantitative recognition and prediction of faulted-related fractures targeting tight reservoir in gentle area.In this paper,this new method is applied to the study on fault-related fracture systems occurred in the Lianglitage Formation in Tazhong X well area,Tarim basin.During this course,taking Tazhong A well as an example,it is pointed out the calculation of VSD mainly include qualitative recognition of fault-related fracture by using fault plane detachment void space theory and quantitative calculation using VSD software,and the latter is composed of structure modeling,stratigraphic modeling,calibration of fracture porosity and VSD calculation.Calculation results of VSD on seismic profiles crossing three wells in the study area are proved available with cores,logging and well drilling data.Quantitative calculation for each single fault,interpreted in the study area,is conducted by using VSD technique,and the plane distribution map of maximum fracture porosity within Lianglitage Formation is obtained.There are seven effective fracture systems with relatively large scale,and the overall development and distribution pattern of fault-related fracture here are closely related to the fault system but not one-to-one correspondence.Finally,it is concluded that whether effective fracture systems are well-developed or not is mainly decided by fault plane detachment void space generated during disharmonic faulting process,that is,effective fracture systems are well-developed if there are detachment void space neighboring the fault plane in the course of faulting,conversely,it is poorly developed.更多还原