惠民凹陷商河砂体储层特征与高分辨率层序地层控制  

Characteristics of Shanghe sandbody reservoirs and high-solution sequence stratigraphic control in Huimin sag

作　　者：樊爱萍[1] 杨仁超[1] 韩作振[1] 陈庆春[2] 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266510 [2]胜利油田公司临盘采油厂,山东临邑251507

出　　处：《中国地质》2009年第4期819-825,共7页Geology in China

基　　金：山东省高校沉积成矿作用与沉积矿产重点实验室(山东科技大学)开放基金项目(DMSM200803)资助

摘　　要：为查明惠民凹陷商河砂体的分布规律、物性特征及其控制因素,本文以高分辨率层序地层学和储层地质学理论和技术为基础,综合采用了岩心观察、薄片鉴定、岩心物性分析、测井解释和压汞分析等多种方法,对商河地区沙二下亚段的层序地层、储层特征及其控制因素进行了综合研究。结果发现,沙二下亚段可划分为3个中期基准面旋回,物性较好的储集砂体主要发育在中期基准面上升早期和下降晚期,且下降半旋回砂岩的孔渗特征一般优于上升半旋回砂岩。研究认为,储层物性与沉积微相密切相关,水下分流河道砂体和河口坝砂体物性最好,储层非均质性较弱;远砂坝和前缘席状砂物性一般略差,湖滩砂和分流间湾砂体物性最差,非均质性最强。储集砂体的平面分布和平面非均质性主要受控于沉积微相的类型和分布,而沉积相带的迁移、相的演化及储层垂向非均质性均受控于基准面的升降变化,故基准面旋回的升降变化对储层的空间展布和非均质性均具有明显的控制作用。Based on theories and techniques of high-solution sequence stratigraphy and reservoir geology, the authors made a synthetic study of sequence stratigraphy, reservoir characteristics and the control factors of the lower subsection of the 2nd Member of Shahejie Formation （Es22） in Shanghe area by such means as drill core observation, slice identification, property analysis of drill core, logging curve interpretation and mercury-injection analysis, with the purpose of detecting the distribution regularity, the properties and the control factors of Shanghe sandbodies in Huimin sag. It is found that the Es22 could be divided into 3 middle base-level cycles. Sandstone reservoirs with relatively good properties occurred mainly in the early stage of the ascending middle base-level cycle and the late stage of the descending middle base-level cycle, and that the properties of sandstone reservoirs in the descending middle base-level cycle are commonly superior to those of the ascending middle base-level cycle. The foUowing conclusions could be drawn： the properties of the reservoirs are closely related to sedimentary microfacies, i.e., reservoirs in subaqueous distributary channel sandbodies and bayou sandbars have the best properties, but with poor inhomogeneity; far sandbars and front sheet sandstone have relatively inferior properties, and beach-sandstone and interdistributary bay sandstone with strongest inhomogeneity have the worst properties. Planar distribution and inhomogeneity of sandbody reservoirs are mainly controlled by types and distribution of sedimentary microfacies. Therefore, the transference and evolution of the sedimentary facies belt and the vertical inhomogeneity of the reservoirs are all controlled by ascending and descending fluctuation of the base-level. As a result, spatial distribution and inhomogeneity of reservoirs are under the control of ascending and descending fluctuation of base-level cycles.

关 键 词：惠民凹陷 商河砂体 储层 层序地层学 

分 类 号：P618.13[天文地球—矿床学]