渤南洼陷沙四上亚段储层成岩作用及物性特征

以沙四上亚段储层为研究对象,开展了储层岩石学特征、成岩作用类型与物性特征等方面的研究。根据岩芯、薄片等资料分析,该区储层岩石类型以岩屑长石砂岩、长石岩屑砂岩为主,主要发育六种成岩作用类型,储集空间以次生孔隙为主,孔隙结构有四种类型。区内储层非均质性强,平面上孔隙度、渗透率表现出南高北低、东西变化不明显。储层物性随成份成熟度、粘土含量、碳酸盐胶结物含量的增加而降低,压实作用、胶结作用破坏了储层物性,溶解作用、断层活动等有利于改善储层物性。

Diagenesis and Physical Property Characteristis of the Upper Shasi Member Reservoir in Bonan Subsag

The paper researched the reservoir of the upper Shasi Member,mainly on the petrologic characteristics of reservoir,the types of the diagenesis and the physical property characteristics.With the combined analysis of the drilling cores and the rock thin sections,it can be concluded that the reservoir rocks consist mostly of lithic arkose and feldspathic litharenite,there exists 6 kinds of diagenetic events.The reservoir space is mainly secondary pore,and the porosity structure mainly includes 4 categories.The heterogeneity of reservoir is strong,physical property of south segment is better than that of north,the east and the west segment is largely the same.With the increase of compositional maturity,the quantity of clay matrix and cement,the porosity and permeability of reservoir decreased.The compaction and cementation destroy characteristics of the reservoir,whereas the dissolution,the fault activity improved characteristic of the reservoir effectively.