正理庄地区沙二段储层成岩作用对孔隙演化的影响  

Impact of reservoir diagenesis on porosity evolution in the second member of Shahejie Formation of Zhenglizhuang area

作　　者：李维岭[1] 姜在兴[2] 倪新锋[1] 张建国[2] 吴秀颀 赖锦[4] 

机构地区：[1]中国石油勘探开发研究院杭州地质研究院,浙江杭州310023 [2]中国地质大学(北京),北京100083 [3]中国石油东方地球物理勘探有限责任公司,河北涿州072751 [4]中国石油大学(北京)地球科学学院,北京102249

出　　处：《油气地质与采收率》2015年第5期52-57,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05009-002)

摘　　要：东营凹陷博兴洼陷正理庄地区沙二段是正理庄油田重要的砂岩储层发育段,储层垂向上变化复杂,对其演化规律认识尚不明确。对研究区岩心、薄片、镜质组反射率、粒度等资料进行半定量分析,明确了储层成岩作用对孔隙演化的控制作用。研究结果表明:沙二段储层的储集空间主要以原生粒间孔和粒内溶孔为主;孔隙演化主要受到压实作用、胶结作用和溶蚀作用的影响;其中,压实作用和胶结作用对孔隙的破坏作用较大,因压实作用减小的原生孔隙平均为19.8%,因胶结作用减少的原生孔隙平均为14.1%,压实作用对孔隙的破坏作用强于胶结作用,且压实作用在整个孔隙演化中占主导地位;溶蚀作用是改善储层孔隙的重要成岩作用,主要集中在中成岩A期,最终因溶蚀作用增加的孔隙度为2.6%。Sandstone reservoirs mainly develop in the second member of Shahejie Formation(Es2)in Zhenglizhuang oilfield of Boxing subsag,Dongying sag. Now the reservoir evolution is not clear because of its large vertical change. To solve this problem,core and thin section observation,data from vitrinite reflectance,and grain size of the study area were semi-quantitatively analyzed to determine the impact of reservoir diagenesis on porosity evolution. The study result indicates that the reservoir space of the target stratum is mainly composed of primary intergranular pore and intragranular dissolved pore.And the reservoir porosity evolution is mainly influenced by mechanical compaction,cementation and dissolution,among which the mechanical compaction and cementation reduce the porosity seriously. Compaction decreased the original porosity by 19.8% averagely and cementation decreased the original porosity by 14.1% averagely,which suggests that the original porosity is reduced more seriously by compaction than by cementation,and that compaction plays an important role in the whole process of porosity evolution. Dissolution is an important diagenesis process that improves reservoir pore space and mainly occurred in middle diagenetic stage A. Eventually,dissolution increased the porosity by 2.6%.

关 键 词：沙二段储层 成岩作用 孔隙演化 半定量分析 正理庄地区 博兴洼陷 

分 类 号：TE112.23[石油与天然气工程—油气勘探]