用核磁共振和高压压汞定量评价储层孔隙连通性——以沾化凹陷沙三下亚段为例  

Quantitative evaluation of pore connectivity with nuclear magnetic resonance and high pressure mercury injection:A case study of the lower section of Es_3 in Zhanhua sag

作　　者：宁传祥 姜振学[1,2] 高之业 李政[3] 朱日房[3] 苏思远[1,2] 李廷微[1,2] 王智[1,2] 黄睿哲 陈磊[1,2] 

机构地区：[1]中国石油大学(北京)油气资源与工程国家重点实验室,北京102249 [2]中国石油大学(北京)非常规天然气研究院,北京102249 [3]中国石化胜利油田分公司地质科学研究院,山东东营257051

出　　处：《中国矿业大学学报》2017年第3期578-585,共8页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2014CB239105);国家自然科学基金项目(41502125)

摘　　要：孔隙连通性是致密储层有效性评价的关键.为了定量评价致密储层孔隙连通性,文中分析了核磁共振和高压压汞所反映的孔隙空间的差异,以核磁共振和高压压汞数据为基础,提出了一种用于评价致密储层孔隙连通性的方法,并用自发渗吸实验验证了其正确性,选取沾化凹陷沙三下亚段典型泥页岩样品为例,对其进行了实例分析.研究结果表明:沾化凹陷沙三下亚段泥页岩孔径分布呈三段式.0~50nm孔体积占总孔隙体积比例平均为66.2%,是泥页岩主要的储集空间;50nm^2μm和大于2μm分别为16.6%和17.2%,二者发育情况相当,是重要的储集空间及运移通道.孔隙连通受控于孔隙尺度及层理发育情况.孔隙尺度越大,其连接到运移通道的概率就越大,孔隙连通性越好;层理的发育一方面提高了大孔隙孔体积;另一方面改善了不同尺度孔隙的连通性.Quantitative evaluation of pore connectivity is essential to tight reservoirs effectiveness assessment.To calculate pore connectivity of tight reservoirs,after thorough analysis of the pore space deference reflected by nuclear magnetic resonance（NMR）and high pressure mercury injection（MICP）,a calculation method using NMR and MICP was proposed and verified by spontaneous imbibition.The lower section of Es_3 in Zhanhua sag was chosen for case study,and the results indicate that the pore distribution can be divided into 3sections.Pores of0—50nm,whose average volume takes up 66.2% of the total,are the most significant reser-voir space.Pores of 50nm—2μm and more than 2μm,with average percentage of 16.6%and17.2%,are also important for storage and migration.Pore connectivity is controlled by the pore size and lamina development.Bigger pores have higher probability to access the migration channel,which leads to better pore connectivity.The lamina development not only increases the large pores volume,but improves the connectivity across different sizes of pores.

关 键 词：核磁共振 高压压汞 孔径分布 孔隙连通性 沙三下亚段 

分 类 号：TE122[石油与天然气工程—油气勘探]