Geological Modeling And Application Of Chang2₁²Oil Reservoirs In The A Part Of Dalugou Area In Ordos Basin

A part in Dalugou area is located in the central Jingan oilfield of Ordos Basin,have about fifteen years of exploration and development history. Chang2is the main production layer. With the development of the extended period the producing-vcewater content is promoting. The need to deploy infill wells in the dead oil zones and the study of the distribution of remaining oil using numerical simulation can provide a reliable basis for encryption deployment. Therefore, the need for further study of fine reservoir correlation, reservoir sedimentology and reservoir characteristics then made reservoir3D geological model to figure out the distribution rules of remaining oil and make the reasonable development plans. The main achievements and conclusions:(1)The Chang21layer of the study area is divided into Chang211, Chang212, Chang213three layers through the fine reservoir correlation study.(2) Chang212period is braided river sediments and developed channel, natural levee,river floodplain three microfacies through the study of sedimentary microfacies.(3) Based on the research of Chang212four-property-relationships the secondary log interpretation model is established. Through the study of reservoir, think of Chang212reservoir is low porosity and low permeability reservoir and the reservoir heterogeneity is strong.(4) By studying the flow units, the Chang212is divided into four types of flow units, mainly in Ⅱ, Ⅲ type flow unit, in the plane is ne to sw banded distribution or patchy distribution.(5) Based on the comprehensive application of various geological information and production data the Chang21reservoir3D geological model including sedimentary facies model and the reservoir parameter model is established. The model parameters were analyzed by numerical simulation and through the remaining oil analysis the conclusion of the Chang212oil remaining in the plane is mainly distributed in the poor reservoir property of the east and vertically distributed mainly in the high position of micro structure fluctuation is reached. According to the research, two operated wells and four infill wells has been designed and the reasonable development plans has been formulated.This study of geological modeling has guiding significance to the oilfield development of A part of Dalugou area in Erdos basin and similar areas.