辽东湾坳陷旅大xx构造沙四段储层物性主控因素分析

Lüda XX Structure Shahejie Formation Forth Member Reservoir Physical Property Main Controlling Factor Analysis in Liaodongwan Depression

辽东湾坳陷旅大xx构造沙河街组四段(Es^(4))发现良好油气显示,储层中孔段、低孔段交替出现,为查明其原因,为后续油气勘探提供参考,在岩心、物性数据等资料基础上,通过常规薄片、铸体薄片及扫描电镜照片观察鉴定等方法对储层物性影响因素进行探讨。结果显示:辽东湾坳陷旅大xx构造沙四段以长石岩屑砂岩及岩屑长石砂岩为主,发育辫状河三角洲前缘亚相,孔隙度中等—好,平均孔隙度15.75%,平均渗透率8.55×10^(-3)μm^(2),以中孔、低孔—特低渗为主;储层物性主要受沉积作用、胶结作用及溶蚀作用影响,压实作用、交代作用及构造作用为次要影响因素。

Good hydrocarbon indications have been found in the Shahejie Formation Forth Member(E s 4),Lüda XX structure,Liaodongwan depression.Medium and low porosity segments are alternatively appeared in the reservoir.To find out the reason for further oil and gas exploration reference,based on rock core,physical property etc data,through traditional thin section,casting sheet and SEM images observation,identification etc means have carried out discussion on reservoir physical property impacting factors.The result has shown that Shahejie Formation Forth Member is formed mainly by feldspathic litharenite and lithic arkose;developed braided river delta front subfacies;porosity medium to good,average 15.75%;average permeability 8.55×10^(-3)μm^(2),mainly medium to low porosity,extra-low permeability.Reservoir physical properties have been mainly impacted by the sedimentation,cementation and dissolution,while compaction,metasomatism and tectonism the next.