Unconventional Oil And Gas Reservoirs Exploration Potential Evaluation In The Lower Bench Of Huanxiling

Huanxi Ling Oilfield,the fourth member of Shahejie formation is a relatively low degree of relative development of one of the relatively low development of the oil field,the four sections of the sand buried deep,poor reservoir properties.In the early part of the exploration and development of the exploration wells only after the oil on the back to the upper level of development,most of the exploration wells and development wells did not even drill or drill through the horizon,and even can be said that there is no basic understanding.Therefore,it is necessary to clarify its geological characteristics and exploration potential,to meet the development needs of adjustment.Based on the seismic data and logging data,this paper aims to find out the geological characteristics and exploration and development potential of the fourth member of Shahejie Formation,focusing on fine structural interpretation,sedimentary microfacies Research and exploration potential assessment,and complete the deployment of well location recommendations.The main subdivision is as follows:(1)The isochronous sequence stratigraphic structure of the fourth member of Shahejie Formation is established.Based on the comprehensive interpretation of core observation and logging data,a fine isochronous stratigraphic framework is established.(2)Using the high-resolution three-dimensional seismic data,combined with the re-zoning sequence and precise horizon calibration,the Shahejie Formation and the Archean buried hill are constructed and explained.(3)The sedimentary microfacies of the fourth member of the Shahejie Formation are studied,and the sedimentary filling is carried out by means of seismic and core data.The microfacies study is carried out from the facies,and the sedimentary microfacies are analyzed.(4)Through the study of seismic attributes and seismic facies,the prediction and analysis of the unconventional reservoir development in the fourth member of Shahejie Formation are completed,and the favorable zone is determined.The results show that the deposition thickness is the largest in the southeastern direction of the Shahejie Formation in the study area,and Du I is thicker than the bulk II.From the characteristics of the wave group,Tex,Tes and Tg of the three reflective layer as a whole are strong energy,in the region within the continuity and scope are better,three are mainly shown in two to three phases.The tectonic structure of the study area is inherited as a whole,and the main fault in the depression is dominated by stretching motion.The whole structure is monoclinic from northeast to southwest,and is mainly developed in a series of north-east and north-east positive faults.The overall source of the study area comes from the source of the West from the southeast from the southeast.The organic matter abundance of the source rock in the special lithology of the study area is relatively good,and the TOC value generallyexceeds 1.5%.Based on the above research results,the well site deployment proposal of three wells is completed on the basis of favorable area superposition map,which provides favorable research ideas for subsequent exploration and development.