The Sedimentary And Reservoir Feature Study On Member 1 And Member 2 Of Shahejie Formation In Gaoyang Oil Field Of Raoyang Depression

The reservoir of Gaoyang oil field of Raoyang depression is mainly controlled by lithology,the tectonic setting is relatively simple,but the oil-water relationship is complicated.In this area,because of the large horizontal change of sand body,complicated multiphase overriding relationship,unclear sand connectivity and the lack of study on reservoir distribution regularity,the efficiency of hydrocarbon devlopment has been seriously restricted.By means of the study on sedimentary microfacies of objective formation this thesis expects to discuss the reservoir sandbody characteristics by several aspects such as form,scope,the lateral and vertical connectivity and reservoir property,and then provide help for the further development of oil field.This study proceedes from the rock cores,observing and descriping the cores of four wells in this area,collecting lithologic composition,sedimentary structure,color,phase sequence and texture,combing the log data and basic data such as thin section analysis and grading analysis,building up single well sedimentary facie,then defined the types of sedimentary microfacies.Guided by sedimentology concept,analyzing sedimentary environment,studying on the source direction,combing the regional sedimentary background,the study has built up facies models of Es₁ and Es₂of central and northern Lixian slope.On this basis,this thesis describes the distribution of different-stage(referring to single sand)and different-location sedimentary microfacies,and describes the distribution of single-sand sedimentary microfacies layer by layer through the connectiong-well section and horizontal plane.It recovers lithofacies palaeogeograph of Es₁and Es₂in this area and makes the distribution feature and overlaying relationship of sandbody clearly.In the meantime,proceeding from different stages and sedimentary microfacies,the thesis studies the reservoir feature by means of macro-analysis and micro-research.To get the relationship between microfacies and reservoir property,the thesis investigates how sedimentary microfacies control reservoir property.Finally,it finishes the comprehensive reservoir evaluation,which has defines that I-type reservoir should be mainly in shore-shallow lacustrine and central unerway-distributary channel,II-type reservoir should be in underway-distributary channel,central distributary channel and lateral margin of bar.III-type should be mainly in the distributary channel margin,lateral margin of bar and shoal deposit.Thus,favorable reservoir in this area has been predicated by multiple prediction.