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南泥湾油田W区长1油层组属曲流河流相沉积,储层岩性以中砂质细粒长石砂岩为主,主要矿物成分为石英,岩屑以变质岩岩屑为主;分选以中等为主,其次为好;磨圆度以次棱角—次圆状为主;颗粒呈点状或点线接触;胶结类型主要为孔隙式,次为薄膜—孔隙式。主要成岩作用有:压实压溶作用、胶结作用、溶蚀作用等。其中压实作用、压溶作用、胶结作用对储层孔隙起到了较强的破坏性作用,溶蚀作用对储层起着较好的改善作用。目前该储层已处于中成岩阶段的A期。属于低~特低孔、特低渗储层。主要的孔隙类型粒间溶孔和剩余粒间孔,储层孔隙结构具有较强的非均质性特点;宏观非均值性也较强;该储层中Ⅲb类、Ⅳa类分别为研究区长1储层中的好、较好储层,Ⅳb类为差储层,Ⅴ类为致密层。
The Nanchangwan oilfield W zone Chang 1 reservoir belongs to meandering river facies deposition. The reservoir lithology is mainly composed of medium-fine grained feldspar sandstone, the main mineral composition is quartz and the detrital rock is mainly metamorphic rock cuttings. Select the medium-based, followed by good; degree of roundness to sub-angular - secondary round-based; particles were point or point line contact; cementation types are mainly pore type, the second is the film - pore type. The main diagenesis are: compaction pressure solution, cementation, dissolution and so on. Compaction, pressure solution and cementation play a strong destructive role in reservoir porosity, and dissolution plays a good role in improving the reservoir. At present, the reservoir has been in the A phase of the diagenetic stage. Belong to low ~ special low-porosity, ultra-low permeability reservoir. The main pore types of intergranular dissolved pores and the remaining intergranular pores, the reservoir pore structure has strong heterogeneity; macroscopic heterogeneity is also strong; Ⅲb, Ⅳa of the reservoir are the study area 1 reservoirs are good and better reservoirs, IVb is poor reservoir, and V is dense.