大民屯凹陷静52断块油藏裂缝参数研究

Study of Fracture Parameter of Jing 52 Faulted Reservoir in Damingtun Depression

目的：对辽河坳陷大民屯凹陷静52断块油藏宏观及微现裂缝分布特征，裂缝密度及裂缝的有效性进行研究。方法：通过古地磁定向、岩心裂缝的分形描述、CT层析扫描分析及岩石物理模拟研究，对静52断块油藏裂缝恢复至地层围压条件下的各定性参数、定量参数和物性参数进行全面描述。结果：该区主要发育受岩性和断层控制的3组高角度张性裂缝，它们控制了油气的分布与渗流系统。随着岩石中暗色矿物减少，裂缝密度变大，连通性变好，充填越弱，则裂缝的有效性和储渗性能越好。结论：CT层析扫描技术是分析储层裂缝有效性及其三维空间分布的有效手段，它能无损地分析岩心片内部结构，而且当岩心还密封在岩筒内时就可进行，避免了对裂缝的许多不必要干扰，能更真实地评价裂缝在地层条件下的有效性。

The parameters of fractures are the important geological basis on arrangement of development scheme of the fractured reservoir. Through core orientation by paleomagnetism, fractal description, analysis of mi-cro- thin section and CT-tomography scanning and petrophysical modelling, the quantitative, qualitative and physicoproperty parameters returned to confining pressure and the availability of fractures in Jing 52 faulted reservoir are described and evaluated in the paper. There are three sets of fractures with high dip-angle controlled by lithology and fault in the study site, they controlled the oil distribution and seepage system of the reservoir.With the devrease of dark - colour mineral in lithology, the fractures developed and jioned well, they were filled weak and had good availability and functions of accumulation and seepnge for oil.