基于岩石物理相的储集层孔隙结构分类评价——以鄂尔多斯盆地姬塬地区长8油层组为例  

Pore structures evaluation of low permeability clastic reservoirs based on petrophysical facies: A case study on Chang 8 reservoir in the Jiyuan region, Ordos Basin

作　　者：赖锦[1] 王贵文[1,2] 陈敏[1] 王书南[1] 柴毓[1] 蔡超[1] 张永辰[1] 李鉴伦[1] 

机构地区：[1]中国石油大学(北京)地球科学学院 [2]中国石油大学(北京)油气资源与探测国家重点实验室

出　　处：《石油勘探与开发》2013年第5期566-573,共8页Petroleum Exploration and Development

基　　金：国家科技重大专项"低渗透碎屑岩储层品质与岩石物理相测井评价方法"(2011ZX05020-008)

摘　　要：利用岩心、薄片、钻井、测井等资料,研究鄂尔多斯盆地姬塬地区长8油层组储集层沉积相、成岩相和裂缝相特征,据此分析长8油层组储集层岩石物理相,对储集层孔隙结构进行分类评价、预测有利孔渗发育带。通过沉积微相、成岩相和裂缝相的叠加与复合对研究区长8油层组储集层岩石物理相进行分类命名,划分出水下分流河道-不稳定组分溶蚀-高角度斜交缝等岩石物理相;按照沉积相、成岩相和裂缝相对储集层孔隙结构的建设与破坏作用归纳总结出4大类岩石物理相。分别计算了不同岩石物理相的储集层品质指数,由此基于岩石物理相划分并结合测井资料实现了长8油层组单井纵向上的孔隙结构分类评价。最后以小层为单位对长8油层组纵向沉积微相和成岩相进行剖面展开和平面成图,通过有利岩石物理相的展布实现了其有利孔渗发育带分布的预测。The sedimentary facies, diagenetic facies and fracture facies of the Upper Triassic Yanchang Formation Member 8 （Chang 8） reservoir in the Jiyuan region were studied using core observation, thin section, logging and drilling data. On this basis, the petrophysical faices of Chang 8 oil layers were examined to evaluate the pore structure by classification and predict zones with high porosity and permeability. The petrophysical facies were divided according to the superposition and combination of sedimentary facies, diagenetic facies and fracture facies. A number of petrophysical facies of Chang 8 oil layers such as underwater distributary channel, dissolution of unstable components, high-angle fracture, were identified in this way. Four main categories of petrophysical facies were summed up according to the constructive and destructive impact of sedimentary facies, diagenetic facies and fracture facies on the reservoir property and pore structure of Chang 8 oil layers. Since the reservoir quality index （RQ1） is an optimal indicator for describing the reservoir micro-pore structure quantitatively, the value of RQI of different petrophysical t＇acies was calculated respectively. So the classification and evaluation of Chang 8 reservoir pore structure in a single well were realized by the division of petrophysical facies combined with logging data. At last, the vertical and horizontal distribution of sedimentary micro-facies and diagenetic facies of each single layer of Chang 8 oil layers were mapped, the distribution of favorable petrophysical facies can be used to predict the zones with high porosity and permeability.

关 键 词：岩石物理相 沉积相 成岩相 裂缝相 孔隙结构 分类评价 鄂尔多斯盆地 长8油层组 

分 类 号：TE122.1[石油与天然气工程—油气勘探]