一种新的裂缝储层的数值模拟方法

A new numeric simulation method of fractured reservoir.

为了客观地反映裂缝储层的地震波场特征,本文在前人研究的基础上,提出了一种新的裂缝储层数值模拟方法——微观矢量宏观标量法(MIVMAS)。该方法综合考虑裂缝发育带内裂缝与围体介质的物理性质,利用微观的Christoff矢量方程计算每个裂缝发育带的等效纵波速度,得到新的速度模型和反射系数模型;然后利用波动方程的数值模拟方法,采用宏观的标量波动方程对新模型进行数值模拟。该方法以裂缝带整体特征为研究对象,得到的数值模拟结果更符合实际,为裂缝储层的波场特征研究提供了一种新的思路和方法。

In order to objectively reflecting the feature of seismic wavefield in fractured reservoir,the paper,on the basis of predecessors' studies,presented a new numeric simulation method of fractured reservoir——Micro Vector and Macro Scale (MIVMAS).The method comprehensively considers the physical properties of fractures and surrounding materials in fracture-developed zones and uses micro Christoff vector equations to compute P-wave-equivalent velocity in each fracture-developed zone,which obtains new velocity model and the model of reflection coefficients; then,using numeric simulation method of wave equation,the numeric simulation of new model is carried out by macro scalar wave equation.Taking the whole feature of fracture zone as studied target,the results of numeric simulation obtained by the method are more consistent with reality,which provides a new idea and method for study of wavefield feature in fractured reservoirs.