岩性油气藏储层非均质性成因模式——以鄂尔多斯盆地榆林—米脂地区盒8段为例  

Genesis modes of heterogeneity of lithologic hydrocarbon reservoir:a case study in He8 member of Xiashihezi formation,Yulin-Mizhi area,Ordos Basin

作　　者：陈安清[1,2] 陈洪德[1,2] 林良彪[1,2] 侯中健[1,2] 向芳[1,2] 徐胜林[1,2] 王峻[1,2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059

出　　处：《油气地质与采收率》2010年第3期19-23,112,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家重大科技专项"鄂尔多斯盆地碎屑岩层系大中型油气田富集规律与勘探方向"(2008ZX05002-001)

摘　　要：储层的非均质性是影响岩性油气藏勘探开发效益的关键因素之一。通过分析鄂尔多斯盆地榆林—米脂地区的基准面旋回层序叠加样式与砂体成因、储层物性特征和成岩相组合特征,识别出3种类型的基准面旋回叠加样式,不同位置和不同沉积体系中发育不同的基准面旋回叠加样式;主要分为压实、压实—胶结和胶结—溶蚀3种成岩相组合;建立了物性向上变化不大、物性向上变差、物性向上变好、物性向上变差后复变好、物性向上变好后复变差和物性变化复杂6种储层非均质性成因模式。基准面旋回变化和成岩作用是岩性油气藏非均质性的主要控制因素。在中期基准面旋回早期,充填在层序界面之上的进积—加积型的分流河道和水下分流河道砂体以发育物性向上变化不大、物性向上变差和物性向上变差后复变好3种成因的非均质性储层为主,非均质性相对较弱,为最有利的储层发育相带。The heterogeneity of reservoir is a key factor which affects the exploration and exploitation.This paper analyses the characteristic of the reservoir physical property,diagenetic facies and sequence filling types of the base-level cycle,and established six modes of heterogeneity reservoir formed by base-level cycle,and then suggests that base-level cycle and diagenetic facies is the main control factor of the heterogeneity of the subtle gas-oil reservoir.In conclusion,in the early base-level cycles,the superimposed progradational-aggradational sandbody of the distributary channels and the submerged distributary channels developed theⅠ,ⅡorⅣgenesis modes of heterogeneity reservoir with relatively weak heterogeneity,which is the most favorable facies belt of reservoir.

关 键 词：储层 非均质性 成因模式 基准面旋回 成岩相 盒8段 鄂尔多斯盆地 

分 类 号：TE112.22[石油与天然气工程—油气勘探]