塔里木盆地库车坳陷东部下侏罗统煤系地层致密砂岩储层特征  

Reservoir bed characteristics of tight sandstones within coal measure strata of the lower Jurassic in the eastern Kuqa depression,Tarim basin,China

作　　者：秦红[1] 戴琦雯[2,3] 袁文芳[1] 刘洛夫[2,3] 曹少芳[1] 苏天喜[2,3] 张博[1] 姜振学[2,4] 

机构地区：[1]中国石油塔里木油田勘探开发研究院,新疆库尔勒841000 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油大学(北京)盆地与油藏研究中心,北京102249 [4]中国石油大学(北京)非常规天然气研究院,北京102249

出　　处：《东北石油大学学报》2014年第5期67-77,9,共11页Journal of Northeast Petroleum University

基　　金：塔里木油田公司项目(041010020005)

摘　　要：在岩石薄片观察与包裹体均一温度分析的基础上,研究塔里木盆地库车坳陷东部下侏罗统煤系地层中砂岩储层特征与孔隙演化史.结果表明：储层成分主要为岩屑砂岩,成岩压实减孔量为25％-38％,碳酸盐胶结物的形成时间晚于硅质胶结物的;有利储层发育受沉积、成岩及构造等因素影响,压实作用对储层物性的影响远大于胶结作用的;砂岩粒度越粗,抗压实效果越好,溶蚀强度也越强,裂缝越发育,溶蚀强度越强;有利储层主要发育在粒度较粗的辫状河道相或裂缝较发育的强溶蚀层段.有利储层研究为气藏预测和开发提供参考.According to the statistics of casting thin slice data and inclusion-homogenization temperature data of minerals,the study of reservoir beds characteristics and porosity evolution of the sandstones within the lower Jurassic coal-measure strata in the eastern Kuqa depression,Tarim basin,northwest China,show that the rock composition in this region is mostly lithic sandstone,the decreasing content of compacted pores of present reservoir beds could reach 25% ~38%,and the carbonate cements were formed later than the quartz overgrowth edge.The development of favorable reservoir beds are comprehensively controlled by sedimentation,diagenesis and tectonism:The effect on physical property of reservoir bed is more from compaction than from cementation;coarser sandstone possesses stronger compaction resistance and is more vulnerable to dissolution;better developed fractures result in stronger dissolution ability of sandstone.Therefore,the relatively coarse sandstones that occur in braided channel facies and the strongly dissolved strata with well developed fractures are predicted to be the favorable reservoir beds in the study area.The research of favorable reservoir beds can provide some references for the gas forecast and development.

关 键 词：煤系地层 有利储层 酸性水介质 下侏罗统 库车坳陷 

分 类 号：TE121[石油与天然气工程—油气勘探]