Fine Description Of Shahejie Reservoir Of Checheng Oilfield

Checheng Oilfield is located in Nanzhiqiu Town of Xinji,Hebei Province.It belongs to lithologic-structural reservoir,which has the middle porosity,low permeability and complex structure.Multiple oil-bearing layers are drilled in a well,and oil sands have a small area in this oilfield.Since it was put into production,it has gradually exposed the problems such as lack of formation energy,rapid decline in production,serious contradiction between injection and production,and difficulty in water flooding development,these problems seriously affect the development effectiveness of the oilfield.Though a lot of research work has been down on oilfield structure and reservoir,the understanding on the whole still needed to be intensified,and it was short of summary on the ways of research.To fix the problems mentioned above,On the basis of sedimentology,petroleum geology,reservoir geology,logging geology,reservoir description theory,combined with the research achievements of Shahe Street group of the early stage of reservoir development,the fine division and fine structural interpretation of the study area are carried out based on the drilling-seismic method.The study of sedimentary facies and sedimentary microfacies is carried out by the combination of core observation,logging facies analysis and sedimentary relative profile.3D modeling technology is used to establish reservoir geological model and attribute model,while deepening reservoir awareness.Through well seismic combination,on the basis of full implementation of the tectonic framework,the oil fields and small layers of the 110 wells in the oil field are subdivided and adjusted in a new way.Subdividing the single sand body,and realizing the reserve scale of the reservoir.The sedimentary facies of oil-bearing sand bodies are studied,fine description of the distribution of sand bodies and sedimentary facies change characteristics.Based on the fine contrast of the small layers and the study of the sedimentary microfacies in this area,combined with geological research,logging and reservoir dynamic information,3D geological and attribute model are established.Based on the detailed description of the Shahejie formation reservoir,the distribution characteristics of effective sand bodies are determined,and the reserve scale of reservoirs is defined;The sedimentary facies in the study area is near shore shallow lake deposits,sedimentary microfacies is nearshore beach bar microfacies,beach sand microfacies,lake mud flat.Through the establishment of 3D visualization geological model and attribute model,this paper not only deepens the understanding of the formation and distribution of remaining oil,but the corresponding countermeasures for tapping the potential are determined,which is of great significance to guide the waterflood development of the complex fault block oilfield.