| In this paper,the Yan9 reservoir group of Jingan Oilfield,located in the northeast part of the Yishan slope structural unit in Ordos Basin,is studied.The lithologic characteristics,pore structure characteristics,physical properties and heterogeneity characteristics,diagenesis and other characteristics of Yan9 reservoir in Y66 area were systematically studied by using the geological data such as well-logging curves,logging data,scanning electron microscope,thin casting sheet,cathodoluminescence,X-diffraction,high pressure mercury pressure,nuclear magnetic resonance,oil-water seepage and so on,and The Yan9 strata are divided and compared.Provides a true and reliable theoretical basis for future exploration and development of the study area.The reservoir in the study area is delta plain subfacies,the main types of microfacies are distributary channel microfacies and interchannel microfacies,there are two or three distributary channels in the north-east-south-west direction on the plane;The rock type is mainly feldspar sandstone,and the main diagenesis is compaction,cementation and dissolution,the pore types are intergranular pore,intergranular pore,followed by feldspar pore,The pore assemblage is intergranular pore-soluble pore type,and the pore throat assemblage is mainly mesopore-medium fine throat type and pore-fine throat type;According to the data of physical properties,Yan9 reservoir is a low-porosity and ultra-low permeability reservoir.The heterogeneity of reservoir is strong,the porosity heterogeneity is weak,the permeability heterogeneity is strong,and the change of permeability in plane is directional;The sensitivity of the reservoir is characterized by medium-weak speed sensitivity and water sensitivity,weak salt sensitivity,medium-weak acid sensitivity,weak alkali sensitivity-improvement.Reservoir classification is divided into 5 categories,Yan9 reservoir is mainly class IV and class V,only in the local well area developed class Ⅲ reservoir. |
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