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环江—刘峁塬区长8储层砂岩主要为岩屑长石砂岩,其次为长石岩屑砂岩,成分和结构成熟度均较高;储层发育粒间孔隙、粒内溶孔、晶间孔及微裂缝等多种孔隙类型,其中以剩余粒间孔隙最为发育,孔隙结构总体上属于细小孔隙微细喉道。储层物性相对较差,总体属于属典型的超低渗(致密)油藏,但在大面积低渗背景下存在相对高渗区域。研究表明,沉积环境、骨架颗粒的物理化学性质及成岩演化作用是影响区内长8储层物性的主要因素。
The main reservoirs of sandstone of Chang-8 reservoir in Huanjiang-Liugengyuan area are mainly feldspathic feldspathic sandstones, followed by feldspathic lithic sandstones, with high composition and structural maturity. The intergranular pores, intragranular dissolved pores and crystal Intergranular and micro-cracks and other types of pores, of which the remaining intergranular pores are the most developed, the pore structure is generally fine microporous throat. The reservoir properties are relatively poor, and generally belong to the typical ultra-low permeability (tight) reservoirs, but there are relatively high permeability zones in the background of large area and low permeability. The results show that sedimentary environment, physicochemical properties of skeleton particles and diagenesis evolution are the main factors affecting the physical properties of Chang 8 reservoir.