The Study Of Reservoir Characteristics For The Fifth Part Of The Second Member Of The Dainan Formation In The West Of The Lianmengzhuang Oilfield

The research is based on the related data such as seismic data,logging data,drilling data and core data of the Lianxi area in Lianmengzhuang.Conducted by basic geology theory and embarks from careful contrast of 53 wells in the study area to carry out researches of the sedimentary facies,sedimentary microfacies,reservoir lithology characteristics,reservoir pore structure characteristics,reservoir physical characteristics,reservoir heterogeneity,reservoir comprehensive assessment.Following are results:(1)By selecting regional standard layer and local marker layer for identification,the top and bottom boundary specifications,unification and division of three sand layer groups in the first section of the Dainan Formation,five sand layer groups in the second section of the Dainan Formation,and seven sand layer groups in the first section of the Sanduo Formation are completed.By dividing the secondary cycles and grading control,the target layer of E₂d₂⁵in the research area is refined into 19 single sand bodies and identify the main oil-bearing sand bodies.(2)Based on the sedimentary background,rock and mineral characteristics,sedimentary facies symbol and other relevant data,the logging facies,single well facies,profile facies and plane facies of the target layer in the research area are studied.Combined with the data of reservoir property,the sedimentary microfacies and the single well drilling and encounter situation of the single sand body,the heterogeneity of the reservoir in the research area is studied,the heterogeneity of intralayer,interlayer and plane of the purpose layer is serious as a whole,and is the important cause leading to the big differences between the producing well,and points out the sedimentary microfacies in the research area are the important factors affecting the reservoir heterogeneity.(3)Selecting the porosity and permeability of the reservoir property,the thickness of single permeability sand body,the sedimentary microfacies as parameters studies the half qualitative and quantitative reservoir comprehensive assessment of the reservoir of E₂d₂⁵.The underwater channel sand of the front of the delta and the mouth bar sand of the objective layer in the study area are mainly divided into?kind of reservoir,the distributary channel sand of the plain of the delta is mainly divided into?kind of reservoir,the beach dam reservoir sand is into?class,the sedimentation of the overflow facies and the end of front are divided into?kind of reservoir.(4)The reservoir in the study area is relatively developed.The distribution of sand body and quality reservoir is controlled by the underwater distributary channel.Underwater distributary channel sands and estuarine sand dams belong to type?reservoir and type II reservoir.Lakeside beach sand banks belong to type?reservoir.Overflow facies and front end facies belong to type? reservoir.