Research Of Favorable Reservoirs Prediction Of Guantao Upper Section On Chengdao Oilfield Eastern Slop

This paper studies channel sand reservoirs of Guantao upper section on Cheng Dao oilfield east slope,Combining sedimentary,tectonic and other regional geological background of the study area,making analysis on forming conditions and accumulation factors.Predicting and evaluating the favorable reservoir to locate the favorable district,where is the appropriate place to drill.The geographical position of the Chengdao oil field is located in the north of Hekou District,Dongying City,Shandong Province,southern Bohai Bay offshore neritic waters,depth2m to 18m,its favorable exploration area is about 700km~2.The east slope belongs to Chengbei low uplift in Southeast.Chengdao oil field is a big anticline,which developed based on the sub-mountain in Tertiary Period,and it is rich in oil and gas.In recent years,there are lots of drills have been drilled in Chengdao body and surrounding Guantao group stratum,as well as,many drilled wells.Good oil and gas shows are obtained through the test of oil and gas wells,fully explain the good resources of the east slope area.However,due to the limitation of the river sand body and the variability,the immigration of the river is frequent and the sand body distribution is not continuous,which leads to the difficulty of sand body tracking.Therefore,the distribution and development of river sand bodies in the upper member of Guantao formation in this area have not been cleared for a long time,and lack of fine characterization and description of river sand bodies.On the basis of the existing of stratigraphic division and correlation in Chengdao area,taking well logging,well recording,drilling and high precision 3D seismic date into consideration,the stratigraphic sequence is divided,and the fine stratigraphic correlation framework is established on the east slope of Chengdao Oilfield of Guantao group.Has launched the detailed research and analysis of sandbody thickness,plane distribution and the planar distribution of the study area sedimentary facies,sedimentary microfacies,reservoir porosity,grain size characteristics,where sand groups have been drilled.Fine structure interpretation is carried out in the area of Guantao in this area,which makes the horizon interpretation and the close degree of stratum in the seismic profile more accurate.Using the current advanced modeling software Petrel and PaleoScan,Under the constraint of the 3D seismic data,faults and strata in this area as well as reasonable human intervention,establishing the three-dimensional seismic stratigraphic model of the area.With the stratigraphic model,seismic attributes can be extracted through the stratas.Then getting property maps of river sand body with small layer as a unit.The spatial distribution of sand bodies in the upper section of Guantao formation is described,and the detailed description and evaluation of the spatial distribution of the sand bodies are described.The 3D stochastic simulation algorithm is used to draw the thickness map of the top surface of sand body.Finally,the regional structure and reservoir characteristics are further studied,focusing on the analysis of the reservoir forming characteristics and accumulation factors,also,the key reservoir is dissected and analyzed.Combing with the favorable channel sand body predicted Previous,the final favorable selection and location information can be predicted.