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塔河油田奥体系发育孔、洞、缝等多种储集体,空间非均质性极强.定量刻画不同类型储集体及其物性在三维空间的展布一直是该类油藏开发的技术难题.本文采用一种基于马蒙算法的地质统计学反演方法,结合地质、测井先验信息,获得表征缝洞储集体类型及反映物性参数的纵波阻抗数据.再通过寻找波阻抗与储集体孔隙度之间的统计关系,利用一种“云变换”手段,协模拟得到缝洞储集体等效孔隙度数据体,以此从物性角度定量评价缝洞储集体的空间非均质性.与常规方法对比说明,该方法评价结果与井点解释物性有较高的吻合程度,井间趋势上更加尊重地震响应特征,是一种地震数据主控的储集体物性评价方法,对于强非均质性油藏的物性发育规律评价具有指导意义.
The Ordovician system of Tahe Oilfield developed many reservoirs such as pores, holes and seams, and has very strong spatial heterogeneity. Quantitative characterization of different types of reservoirs and distribution of physical properties in three-dimensional space has been a technical challenge for the development of such reservoirs In this paper, a geostatistical inversion method based on the Marmont algorithm is used to obtain the P-wave impedance data which characterizes the type of reservoir and the physical parameters reflecting the geological and logging a priori information. Porosity and porosity of the fractured cave reservoirs, the equivalent porosity data of fractured reservoir was simulated by a “cloud transformation” method to quantitatively evaluate the spatial heterogeneity of fractured cave reservoirs Compared with the conventional method, the result of this method is in good agreement with the interpretation of the physical properties of well points, and the seismic response characteristics are more respected in the trend between wells, which is a reservoir physical property evaluation method controlled by seismic data. It is instructive to evaluate the physical property development of homogeneous reservoirs.