饶阳凹陷武强地区沙二、沙三段储层成岩作用分析

Diagenesis analysis of reservoirs in Es2 and Es3 in Wuqiang area of Raoyang sag

为明确饶阳凹陷武强地区沙二、沙三段有效储层的成因和分布规律,通过岩心观察、镜下薄片鉴定分析储层的岩石学特征、储集空间类型和成岩作用类型;结合物性测试和镜质体反射率测试等资料,研究该区储层的成岩阶段和成岩演化过程及其对物性的影响.结果表明：长石砂岩和岩屑长石砂岩是研究区主要的砂岩类型,结构和成分成熟度为中等;储集空间主要为次生溶蚀孔隙,此外发育少量原生孔隙和裂缝;储层埋藏深度大,整体以中低孔、中—低渗储层为主;储层成岩阶段主要处于早成岩B期 中成岩A期,受烃源岩成熟过程的影响,垂向上次生孔隙主要发育深度为2 400-2 800 m.该研究对武强地区的油气勘探和开发具有指导意义.

In order to know the contributing factor and distribution of effective reservoirs,the type of diagenesis and diagenetic evolution were studied via core analysis,thin section analysis,and core conventional analysis.The result showed:the main rock type are arcose and lithic arkose.and the textural maturity and compositional maturity are moderate.Dissolution pores are the main pores,as well as a few primary pores and fractures.The buried depth of the reservoirs in Es2 and Es2 is very high,making the porosity and permeability low to moderate.The diagenetic stage of the reservoirs belongs to stage B of the early diagenesis,and stage A of the middle diagenesis.Diagenetic analysis indicates that secondary pores mainly exist vertically in a depth range of 2 400~2 800 m due to the process of the maturation of source rocks.This study will be helpful to guide the oil and gas exploration and development.