基于优化熵权的储层非均质性定量表征新方法研究——以鄂尔多斯盆地志丹油区F井区长611储层为例  

Study on a new method for quantitative characterization of reservoir heterogeneity based on optimized entropy weight: an example of the Chang 611 reservoir in the F well area of Zhidan Oilfield in Ordos Basin

作　　者：周志杰 张小莉[1,2] 杨振 阎媛子 李亚军[4] 孙欢 ZHOU ZhiJie;ZHANG XiaoLi;YANG Zhen;YAN YuanZi;LI YaJun;SUN Huan(Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China;National and Local Joint Engineering Research Center of Carbon Capture and Storage Technology,Xi'an 710069,China;Shaanxi Energy Institute,Xianyang 712000,China;School of Petroleum Engineering and Environmental Engineering,Yan'an University,Yan'an 716000,China)

机构地区：[1]西北大学地质学系/大陆动力学国家重点实验室,西安710069 [2]二氧化碳捕集与封存技术国家地方联合工程研究中心,西安710069 [3]陕西能源职业技术学院,咸阳712000 [4]延安大学石油工程与环境工程学院,延安716000

出　　处：《地球物理学进展》2023年第4期1713-1721,共9页Progress in Geophysics

基　　金：陕西省自然科学基础研究计划项目“二氧化碳咸水层封存选址优化研究”(2022JC-DW-09);陕西能源职业技术学院科研项目(2020KYP07);国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069-002)联合资助。

摘　　要：储层非均质性综合指数计算能够为非均质性定量表征提供重要的参数依据,对预测油田开发有利区以及寻找剩余油有重要意义.为了进一步提高计算储层非均质性综合指数的准确性,本文提出在原熵权法算法基础上,引入相关系数,计算指标参数间的冲突性,然后根据冲突性大小重新分配参数权重,对熵权法计算的权重优化,进而计算储层非均质性综合指数.最后,以鄂尔多斯盆地志丹油区F井区长611小层储层非均质性研究为例,应用该方法对非均质性主控因素分析以及储层非均质性定量表征.结果发现,该方法实现了研究区长611小层储层非均质性类型的定量划分,且实际地质应用效果良好.表明基于优化熵权的储层非均质性定量表征新方法适用于不同层次规模的非均质性影响因素研究,具有计算简洁、适用范围广、客观性强等显著优势,通过对多项指标参数合理赋权,能够有效避免对同一非均质影响因素的过度刻画,从而对储层非均质性综合指数的准确计算,实现对储层非均质性的定量表征.The calculation of reservoir heterogeneity composite index can balance the influence of many factors and comprehensively reflect the reservoir heterogeneity,which can provide an important parameter basis for the quantitative characterization of reservoir heterogeneity.The practice of oilfield exploration and development has proved that reservoir heterogeneity affects the distribution of oil and water and the efficient development effect of oil.The study of reservoir heterogeneity is of great significance to predict the favorable area of oilfield production and to find the distribution law of residual oil.In order to further improve the accuracy of reservoir heterogeneity composite index calculation,it is proposed to introduce the Pearson correlation coefficient on the basis of the original entropy weight method algorithm,The correlation and conflict between index parameters are calculated to reflect the amount of useful information contained by index parameters.Then the weights of the index parameters are reassigned according to the size of the conflict,so that the weights calculated by the entropy weight method are optimized,and obtain the heterogeneous composite index of the reservoir.Finally,taking the heterogeneity study of Chang 611 reservoir in F well area of Zhidan Oilfield in Ordos Basin as an example,the method is used to quantitatively characterize the reservoir heterogeneity and analyze the main factors about the heterogeneity.According to the size of the composite index,the types of reservoir heterogeneity are classified.It is found that this method can realize the quantitative study of reservoir heterogeneity types.According to the comprehensive index,Chang 611 reservoir can be divided into four types:weak heterogeneous reservoir,medium heterogeneous reservoir,relatively heterogeneous reservoir and strong heterogeneous reservoir,which has achieved satisfactory application effect in practical geological application.The results show that the method has the significant advantages of concise calculation,

关 键 词：熵权法 相关系数 储层非均质性 定量表征 长611储层 鄂尔多斯盆地 

分 类 号：P631[天文地球—地质矿产勘探]