A Study On Chang 1?Chang 3 Oil Enrichment Regularity In Hujianshan Oilfield

The Hujianshan area of Erdos Basin is geographically located in Yulin City,Shanxi Province.It is located in the central and western regions of the Yishan slope.The mainly structure is slanting to the west and part of the regional development of small nasal structure.According to the development and the oil test data of Hujianshan area,the layers above the Chang3 horizon in this regions have more oil wells,good implementation effect and a large potential for increasing reserves.With the development of the process,the study of the tectonic form and the characteristics of the sedimentary microfacies is more and more deep.But the oil and gas enrichment law of the reservoir above the Chang3 horizon has not been clearly understood.In order to solve the problems in the reservoirs above the Chang3 horizon in the Hujianshan area,this paper takes the Chang 1?Chang 3 reservoirs in the Hujianshan area as the research object,and takes the relevant disciplines such as fine reservoir description,sequence stratigraphy,sedimentary petrology and so on,The stratigraphic division and comparison of the Chang 1?Chang 3 reservoirs were carried out by drilling,coring and logging data.The Chang 1 ? Chang 3 reservoirs were divided into Chang 1,Chang 2₁,Chang 2₂,Chang 2₃,Chang 3₁,Chang 3₂ and Chang 3₃.On this basis,the sedimentary facies of Chang 1?Chang 3 reservoirs were studied by analyzing the sedimentary facies sign.The study shows that the sedimentary facies of Chang 1?Chang 3 reservoirs are delta plain sediments,and the main sedimentary microfacies are distributary channels and diversion bay.Based on the study of single well facies,the vertical facies and planar facies are studied.At the same time,the reservoir characteristics of Chang 1 ? 3 reservoirs are studied by means of core analysis and mercury intrusion experiments.Through the study of the reservoir "four-character" relationship,the reservoir physical property lower limit is established,the logging interpretation model is established,and the secondary interpretation of the logging data is carried out.The results of the secondary interpretation of the logging are used to analyze the plane distribution rule of reservoir physical properties.Based on the results of comprehensive sedimentary microfacies,sand body distribution and reservoir characteristics,the oil and gas enrichment laws of Chang 1 ? Chang 3 oil bed in Hujianshan area were studied.The results show that the Chang 1?Chang 3 reservoirs in the Hujianshan area are related to many factors.The high quality oil-bearing rocks provide oil and gas source,sedimentary facies,sand bodies and reservoir physical properties to control the reservoir space and structure control the degree of oil and gas enrichment.According to the comprehensive analysis,the oil and gas accumulation areas of Chang 1 and Chang 3 reservoirs in the Hujianshan area are mainly distributed in the areas with high tectonic values,and diversion channels,thick sand bodies,high porosity and permeability.