塔河油田二叠系火山岩储集层裂缝参数模拟

基于岩石破裂准则,建立了造缝时期古地应力和现今地应力与裂缝参数之间的关系,通过构造解析确定了造缝时期古地应力的性质和方向,用声速法、水力压裂法和声发射法计算了现今地应力的方向和大小,将裂缝参数计算模型代入古今地应力场的数值模拟结果中,模拟计算了塔河油田二叠系火山岩储集层裂缝的开度、密度和孔隙度。根据岩心观测和测井解释所得的裂缝参数数据编制全区的裂缝线密度与体密度的等值线图来验证模拟结果,表明模拟结果可靠。

Simulation of Fracture Parameters of Permian Volcanic Reservoir in Tahe Oil Field, Tarim Basin

Based on the rules of rock fracture, the relationship between the paleo- and present stresses and the fracture parameters is established, and the feature and direction of paleo-stress during the fracture initiation period are determined by structural analysis. The present stress' direction and size are calculated using sonic velocity, hydraulic fracturing and acoustic emission methods. By substituting the fracture parameter calculation model into the numerical simulation result of the paleo- and present stress fields, the fracture aperture, porosity and density of the Permian volcanic reservoir in Tahe oilfield are simulated and calculated. The fracture parameters from the core observation and log interpretation are used to plot the contour map of fractural line and volume density in the whole area for verification. The result shows that the simulated results are reliable.