长兴组礁滩相储层有效孔隙度下限标准的确定  

Determination of Effective-porosity Lower-limit for Changxing Reef Shoal Reser voir

作　　者：严丽[1] 

机构地区：[1]中国石化勘探南方分公司研究院,四川成都610041

出　　处：《天然气技术与经济》2012年第3期14-17,77,共4页Natural Gas Technology and Economy

摘　　要：长兴组储层孔隙结构复杂,非均质性较强,如何确定其物性下限,一直是储量参数研究的难题之一。结合长兴组礁滩相储层物性特征,提出应用产能模拟法和最小喉道半径法,几种方法相互补充与验证来求解储层物性下限值。产能模拟法是指在实验室利用井下岩心,在全模拟地层的条件下,用不同生产压差与储层厚度研究地层产能,采用极限生产压差下产量与孔隙度的关系来确定有效储层物性下限的方法。最小喉道半径法是依据储层的物性与孔喉大小相关性的原理,利用压汞资料,建立储层孔隙度与喉道半径的关系式,其最小喉道半径所对应的孔隙度即为有效储层的孔隙度下限值。两种方法求取的孔隙度下限为2.0%,与测试法、孔饱交会法的计算结果基本一致。For Changxing reservoir,characterized by stronger heterogeneity,the porous structure is very complicated.So,it is difficult to determine the lower limit of petrophysical-property parameters during reserve calculation.In this study,two methods of both deliverability simulation and minimum throat radius are presented based on an analysis on the petrophysical property of Changxing reef shoal reservoir.These two methods can be used to calculate the lower limit.In the first one,deliverability may be calculated through different producing pressure differential and reservoir thickness under formation simulation in lab;meanwhile,the lower limit can be determined by means of the relationship between production and porosity under the limit producing pressure differential.In another one,the relationship between po rosity and throat radius is established based on the correlation of both petrophysical property and pore-throat size,and mercu ry-injection data;moreover,the porosity,corresponding to the minimum throat radius,is just the porosity lower limit.This limit of 2.0 %,calculated by these two methods,is roughly consistent with the result obtained from test and intersection method.

关 键 词：长兴组 产能模拟 最小喉道半径 孔隙度下限 

分 类 号：P618.130.21[天文地球—矿床学]