直罗油田埝沟区长2油层组储层特征研究

Research on Reservoir Characteristics of Chang2 Oil Group of Niangou Area in Zhiluo Oilfield

从岩石学特征、孔隙类型及特征、物性特征和非均质性等方面对直罗油田埝沟地区长2油层组储层特征进行了研究。直罗油田埝沟地区长2油层组储集层以细粒长石砂岩为主,粒间为点-线接触或线接触,孔隙-薄膜式、孔隙式胶结。残余粒间孔和粒间溶孔为主要的储集空间,孔喉分选一般,以中孔细喉为主,平均孔隙度为15.3%,平均渗透率为3.67×10-3μm2,为中低孔、低渗、特低渗储层。长2油组纵向上自下而上的小层中,储层物性、含油性、渗透率相差较大,层间隔层横向变化也较大。储层平面上物性差异较大,层间非均质性强。

The reservoir characteristics of chang2oil group of Niangou Area in Zhiluo Oilfield are studied from the petrology,pore types and characteristics,physical characteristics and heterogeneity.The reservoir of Chang2oil group of Niangou Area in Zhiluo Oilfield,is fine-grained feldspar sandstone,intergranular of point-line contact and line contact, Pore-film type,pore type cementation.The main reservoir space is residual intergranular pore and intergranular dissolved pore,sorting of pore throat is general,mid-pore and Fine throat are dominated,the average porosity is 15.3%,and the average permeability is 3.67×10-3 μm2,this reservoir is low porosity,low permeability and extra-low permeability reservoir.Chang2oil group is consisted of small layers from bottom to top locations,and the reservoir physical property, oiliness,permeability are large,lateral changes in layer spacing is bigger also.Its plane physical difference is bigger,and interlayer heterogeneity is strong.