Fine Description Of Yan 9 Reservoir Of Yan'an Formation In Liang Zhen Oil Area Of Jingbian Oilfield

Because of the lack of natural energy,the productivity of the production well is low,and the production decline is fast,it is difficult to achieve long-term stable production of the Yan 9 oil reservoir in liangzhen oilfield.Due to the current understanding of the reservoir can't meet the needs of the development,it is necessary to carry out fine reservoir description.This paper using the petroleum geology,sequence stratigraphy,sedimentology and other theoretical and technical methods,based on the data of geology,geophysical logging and core analysis,conducting analysis of the characteristics of reservoir stratification and contrast,reservoir sedimentary study,reservoir characteristics,reservoir classification,and established the reservoir comprehensive classification evaluation criteria.Main conclusions are as follows:(1)this paper used the logging curve and the equal thickness method to divide the Yan 9 reservoir from top to bottom into Yan 91,Yan 92 and Yan 93;(2)Yan 9 reservoir is a meandering river facies sedimentary system,which is composed of three sedimentary microfacies model—meandering channel,natural embankment and flood plain;(3)The reservoirs in the study area are mainly characterized by low porosity and low permeability.The degree of heterogeneity in the three layers of the Yan 9 is relatively weak,but it has strong interlaminar heterogeneity,and the plane heterogeneity of Yan91,Yan92 is weak,Yan 93 is strong.;(4)According to the classification criteria of reservoir physical properties,the wells in the study area can be divided into three categories.Class ? wells accounted for 33%,Class ? wells accounted for 50%,class ? wells accounted for 17% of Yan 91;class ? wells accounted for 40%,class ? wells accounted for 42%,class ? wells accounted for 18% of Yan 92;Class ? wells accounted for 16%,Class ? wells accounted for 29%,Class ? wells accounted for 55% of Yan 93.The division of ?? ? wells is in good agreement with the actual production data,and the reservoir classification is in accordance with the actual situation.