基于等效介质理论的碳酸盐岩储层地震数值模拟

综合考虑碳酸盐岩储层孔隙度、孔隙类型对储层物性参数的影响,对常规的Xu-White模型等效介质理论进行了改进,采用K-T理论增加多种不同类型的孔隙(如粒间孔隙、刚性孔隙、裂隙等),得到了一种新的改进的Xu-White模型等效介质理论,并提出了一套新的适用于碳酸盐岩储层的地震数值模拟方法。该方法首先采用改进的Xu-White模型等效介质理论,来计算碳酸盐岩储层的等效参数,将各向异性的储层转换为均匀介质;然后再采用声学波动方程进行地震数值模拟。模型试验的结果表明,该方法不仅计算效率高,而且可以得到高信噪比的模拟记录,其主要地层的反射波场特征与弹性波方程数值模拟完全一致,是一种简单高效的适用于碳酸盐岩储层的地震数值模拟方法。

SEISMIC NUMERICAL SIMULATION OF CARBONATE RESERVOIR

Considering the carbonate reservoir porosity,pore type on the impact of reservoir parameters.In this paper,using K-T theory to increases many different types of pores(interparticle pores、stiff pores、cracks etc.),the conventional Xu-White model effective medium theory was modified,obtained a new improved Xu-White model effective medium theory;thus proposed a new numerical simulation method for carbonate reservoir.In this method,using the improved Xu-White model effective medium theory to calculate the equivalent parameters of carbonate reservoir,the anisotropic reservoir will be converted to a homogeneous medium;then using the acoustic wave equation to do seismic numerical simulation.Model test results indicate that,this method not only efficient,but the simulation record with high signal to noise ratio,and the main formation of the reflected wave field characteristics as the same as the numerical simulation of elastic wave equation.That is a simple and efficient seismic numerical simulation method for carbonate reservoir.