基于层次分析法和熵权法的储层非均质性定量表征——以胜坨油田坨142块沙二段15砂层组为例

The Quantitative Characterization of Reservoir Inhomogeneity Based on Analytic Hierarchy Process and Entropy Method:A Case Study of 15th Sand Group in Tuo 142 Block Es2 of Shengtuo Oilfield

在相控约束条件下,以胜坨油田坨142块沙二段15砂层组储层为研究对象,选用砂体厚度、有效砂厚、有效厚度系数、孔隙度、渗透率、渗透率变异系数、突进系数及夹层密度8项评价指标建立储层非均质性的评价体系,运用层次分析法和熵权法相结合的方法来确定评价指标的权重,定量计算储层的非均质综合指数,该方法既充分挖掘了原始数据所携带的信息,使评价结果具有较强的客观性,又包含了专家的经验知识,兼顾主观性与客观性,从而实现了研究区储层非均质性的定量评价。使用该方法能够对胜坨油田坨142块沙二段15砂层组储层非均质性进行较为精确的定量评价,有效指导剩余油的挖潜工作。

Under the condition of phase-control constraint,the reservoir of sand 15th group in Tuo142 block Es2 of Shengtuo Oilfield was selected as research object.The evaluation system of reservoir inhomogeneity was established by using 8 evaluation indexes,including the thickness of sand body,the effective sand thickness,the effective thickness coefficient,porosity,permeability,variation coefficient of permeability,dart coefficient of permeability and the density of interlayer.The weight of evaluation indexes was determined by means of analytic hierarchy process and entropy method.The non-homogeneous composite index of reservoir was calculated quantitatively.This method not only fully discovered the information carried by the original data,which made the evaluation results highly objective,but also contained experience and knowledge of experts,which took into account the subjectivity and objectivity.It would help to realize the quantitative evaluation of reservoir inhomogeneity in the research area.By applying this method,it's possible to make more accurate quantitative assessment on the reservoir inhomogeneity of 15th sand group in Tuo142 bloack Es2 of Shengtuo Oilfield,and effectively guide the excavation of the remaining oil.