Research On Under-injection Factors Of Water Injection Wells In Geng83 District Of JiYuan Oilfield

HS oilfield is one of the important oil and gas enrichment areas in Ordos Basin.In 2017,the development of D6 and D8 reservoirs in N block encountered great difficulties.With the continuous development of the research area,there is a big difference between the preliminary understanding of direction and scale of sand body,and it is more and more difficult to explore new reserve blocks.Therefore,in order to develop a new reserve block,it is necessary to study the oil and gas enrichment law of the reservoir in the study area and carry out potential evaluation,which is of great significance to improve the production of the oilfield and optimize the development plan.This paper not only studies the structural characteristics,the spatial distribution characteristics of sedimentary facies and the spatial distribution characteristics of sand bodies in the study area on the basis of fine stratigraphic division and correlation,but also combines the structural characteristics of the reservoir and the distribution law of the reservoir to find the potential oil and gas enrichment zone,and finally completes the research on the oil and gas enrichment rules and the screening of favorable areas in D6 and D8 oil layers.Based on the above research results,it is considered that D6 and D8 reservoirs in the study area have good inheritance,the sand body is thick and distributed in the southwest northeast direction,and the sedimentary facies are mainly turbidite channel and underwater distributary channel,and the sand body is superimposed in the longitudinal upper multi-stage channel.Feldspar dissolution phase and residual intergranular pore dissolution phase are developed in D6 and D8 reservoirs,and they are in late diagenetic A-B stage.According to the characteristics of sedimentary facies,physical property,pore type and structure,the reservoir in the study area is of class ? good reservoir and class ? medium poor reservoir,and has good conditions of source rock,seal and reservoir.Finally,on the basis of diagenesis,pore type,physical property and other data,combined with the oil test and production test of exploration wells and evaluation wells,the favorable target areas of D6 and D8 reservoirs are determined.