金湖凹陷天96断块阜二段储层裂缝多参数定量预测

THE MULTI-PARAMETER QUANTITATIVE PREDICTION OF RESERVOIR FRACTURE OF FU-2 MEMBER IN TIAN 96 FAULT BLOCK OF JINHU SAG

基于应变能、表面能理论,采用格里菲斯岩石破裂准则,建立了金湖凹陷天96断块造缝期古地应力、现今地应力与裂缝参数之间的关系;基于构造分析确定了造缝时期古地应力的类型和方向,用声速法和水力压裂法确定了现今地应力的方向和大小,将古今地应力场的数值模拟结果导入裂缝参数计算模型中,模拟计算了天96断块阜二段裂缝的密度、开度、孔渗参数,并结合古地应力场分析以及岩心裂缝统计数据对裂缝预测结果进行验证;最后,综合分析了影响天96断块裂缝发育的因素。

Based on the theory of strain energy and surface energy,the relationship between the fracture parameters and the ancient and present earth stresses at the fracture forming period in Tian96 fault block of Jinhu sag was established by using Griffith rock-cracking principle. The type and direction of the ancient earth stress were determined through the structure analysis,and the direction and strength of the present earth stress were calculated by using the method of sound velocity and hydraulic fracturing. The numerical simulation results of the ancient and modern stress field were substituted into the calculating model of fracture parameter to calculate the density,opening,porosity and permeability of the fractures in Fu-2 member in Tian 96 fault block. And the fracture prediction results were verified using the ancient stress field analysis and core statistics. Eventually the main factors that affect fractures development in Tian 96 fault block were analyzed comprehensively.