储层含油饱和度评价新方法及其应用  

A New Method to Evaluate Oil Saturation in Reservoir and Its Application

作　　者：高严[1] 朱怡翔[1] 宋本彪[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《中国石油勘探》2011年第2期35-38,86,共4页China Petroleum Exploration

摘　　要：储层岩石含流体饱和度的确定涉及面广、影响因素多、确定难度大,在实际油气藏评价中,需要发展一套实用可靠的饱和度计算方法。在阿尔奇公式的应用中,通常把岩石当成岩石骨架、孔隙和孔隙流体(油气和水)3个组成部分。然而,在多数情况下,油的电性特征与地层的岩石骨架类似,都为电流的不良导体,那么,如果将油成分视为不导电的岩石骨架一部分,则岩石总可认为是充满水的,此时,由阿尔奇公式导出的孔隙度为岩石的含水孔隙度。以该思路为指导,并结合孔隙度测井方法,可以推导出一套岩石饱和度计算公式和可动油评价方法。更进一步,通过实验室岩石毛管压力曲线和油藏中自由水面以上的高度,可标定出不同类型储层的含水饱和度,以此作为测井饱和度计算的检验和校正。将上述方法应用于中东Mishrif厚壳蛤颗粒灰岩饱和度解释和储层评价中,取得了很好的效果。It is very difficult to determine fluid saturation in reservoir rock,because it covers a wide rang and influenced by a lot of factors.So it is necessary to develop a set of practical and reliable methods for saturation calculation in practical oil and gas reservoir evaluation.During the application of Archie formulae,it is usual to regard rock as three components,i.e.rock matrix,pore and pore fluid (oil-gas-water).However,in most cases electrical performance characteristics of oil are similar to rock matrix of strata,and they both belong to poor conductor of electricity.So rock could always be considered to be full of water if taking oil components as a part of non-conductive rock matrix.And then the saturation derived from the Archie formulae is the water saturation of rock.Based on this,a set of formulae for calculating rock water saturation and methods for evaluating movable oil could be derived,with the porosity logging method.Further,water saturation of different types of reservoir could be calibrated through the rock capillary pressure curve in the lab and the height above free surface of water in reservoir.It could be used for inspecting saturation calculation in logging.Good results have been obtained by applying the method mentioned above to saturation interpretation and reservoir evaluation of Mishrif rudistid grain limestone.

关 键 词：阿尔奇公式 含水导电孔隙度 含油饱和度 Mishrif厚壳蛤颗粒灰岩 可动油 储层评价 

分 类 号：TE112.2[石油与天然气工程—油气勘探]