陕北新庄地区延长组长2油层组储层特征

一般河道砂体的正粒序性决定了其下部物性条件优于上部,但新庄地区长2油层组河道砂体的物性特征截然相反,而是中上部物性条件好,下部物性条件普遍差.在储层岩石学特征、孔隙类型等研究的基础上,对此进行了探讨,认为造成其特殊性的原因主要是由于压实、胶结、次生加大等作用.指出河道边滩砂体中上部储层为该区的主力储层.

The reservoir characteristics of the Chang-2 oil-bearing strata group of Yanchang formation in Xinzhuang area in the north of Shaanxi province

It's well known that lower segment of stream sandbody with positive sequence has better porosity and permeability than upper one of stream sandbody,but there is an exception in Chang-2 oil-bearing strata of Yanchang formation.Based on the study of petrology characteristics and types of pore,authors point out that bad porosity and permeability in the lower segment is the result of cementation in the diagenetic stage.We hold that compaction,cementation and secondary enlargement should be leading role.The best reservoir locates in the upper segment of stream sand stone in the area.