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孔洞型储层是国内非均质碳酸盐岩油气藏中最常见的一类重要储层。但关于用测井方法计算这类储层油气饱和度的研究却十分薄弱,多数情况仍沿用传统方法。本文首先从理论上分析了孔洞型储层岩电关系,得出了其岩电关系曲线存在特殊的“平台”现象,通过一系列具有特定孔洞特征的岩心的单因素数值模拟和岩电实验,详细研究了不同孔洞大小、数量及分布对岩电关系的影响。在此基础上,基于饱和度通解方程理论确定了孔洞型储层测井饱和度解释方程的具体形式,从水电相似原理出发推导得出方程参数是与孔洞和基质孔隙的大小分布等孔隙结构有关的物理量。基于此,提出了一种利用核磁测井资料构造核磁毛管压力曲线、求取孔隙结构参数、进而确定方程待定参数的方法。现场应用证明,新方程的饱和度计算结果与取心分析结果符合良好,平均绝对误差为5.8%。。
Porous reservoirs are the most common type of important reservoirs in heterogeneous carbonate reservoirs in China. However, the study of using well logging methods to calculate the gas-oil saturation of such reservoirs has been very weak. In most cases, the traditional methods are still used. In this paper, we first analyze the rock-electricity relationship of the hole-type reservoirs theoretically and find that there is a special “platform ” phenomenon in the rock-electric relationship curve. Through a series of single-factor numerical simulation of core with specific hole characteristics and rock electric Experiments were conducted to study in detail the influence of different hole size, number and distribution on the relationship between rock and electricity. Based on the theory of general equations of saturation, the exact form of well logging saturation interpretation equation is determined. Based on the similarity principle of hydropower, the equation parameters are derived from pore structure such as size distribution of pores and matrix pores The amount of physical. Based on this, a method of using nuclear magnetic logging data to construct the pressure curve of the nuclear magnetic capillary tube to get the pore structure parameters and determine the parameters to be determined is also presented. The field application shows that the new equation is in good agreement with the results of coring analysis, with an average absolute error of 5.8%. .