Seismic Interpretation And Reservoir Prediction Of Fuyu Reservoir In Zhao7 Block

Zhao 7 block is located in the central depression of Songliao Basin and the Songfangtun nose structure of Sanzhao Sag.At present,exploration and development has entered a later stage.Due to the influence of low well pattern density and poor sand body development,the difficulty of development is increasing.The existing geological knowledge can not satisfy and guide the exploration work.Therefore,it is urgent to carry out the research of seismic interpretation and well-seismic combined reservoir prediction.On the basis of regional geological knowledge,guided by the principle of high resolution sequence stratigraphy,and based on logging data to identify sequence base level cycles,the high resolution sequence stratigraphic framework of the whole region is established through joint well-seismic calibration.Fine horizon interpretation and fault interpretation are carried out by three-dimensional visualization and coherence cube.Through velocity analysis,four tectonic maps of reflectors were made.The overall pattern of the study area is "high in the west and low in the east,high in the south and low in the north".The faults are normal faults,and the strike is NNE,NNW and near SN.Structural traps are mainly fault block and anticline,and most of them are small traps.Large traps are located in the middle of the study area,and have good inheritance as a whole.Sensitivity analysis of logging curves,curve reconstruction of spontaneous-potential curve and wave impedance curve,geostatistical inversion of Zhao7 block,and reservoir prediction of Fuyu reservoir are completed.Seventeen predicted thickness distribution maps of sandstone are obtained.As a whole,sandstone is unevenly distributed,with poor connectivity and strip distribution.FI and FII sand bodies are well developed,while FIII sand bodies are poorly developed.After extracting and analyzing the attributes of the study area,the amplitude attributes suitable for Zhao7 block are optimized,and it is found that the amplitude attributes and frequency division attributes are complementary.Seismic facies research based on attribute fusion is carried out with seismic inversion slices,and channel micro facies is described precisely with fixed point of logging facies.The characteristics and changes of channels are studied of each layers.It can be seen that some of the rivers of FI and FII are well developed,and most of rivers are NNE and SN.The oil-water relationship of Fuyu reservoir is the upper reservoir and the lower dry reservoir as a whole.The reservoir types are structural-lithologic reservoir and fault-lithologic reservoir.The main oil and gas accumulation layers are FI oil group and upper FII oil group.Channel sand bodies,structural traps and oil source faults are the key factors for hydrocarbon migration and accumulation.By synthesizing the structural characteristics,reservoir characteristics and reservoir characteristics of the study area,the favorable distribution of Fuyu reservoir is predicted.On this basis,two horizontal wells are proposed and designed,which provides a favorable idea for oil and gas production.