Study On Fine Structural Interpretation In Southern Liuxi Oilfield Of Raoyang Sag

The exploration history of Raoyang sag is over 40 years,although the oil distribution of Liuxi structure has been studied for years,the study on fine structural interpretation of Neogene is not deep enough,especially the identification and interpretation of lower-order faults.Those subtle faults do not control oil accumulation,but play an important role in oilfield development.Therefore implementing efficient fine structural interpretation and applying detailed structural information to conduct further research on regional structure characteristics are core issues needed to be solved.This paper is based on three-dimensional seismic data and well log data,guided by structural geology and seismic exploration theory,making full use of advanced seismic interpretation technology to study the structural characteristic of southern Liuxi oilfield.Using seismic data and well log data to carry out strata classification and correlation,on the basis of the geological stratification,by means of synthetic seismogram,combined with seismic section to adjust and perfect the geologic stratification of well repeatedly,to make sure the geological stratification is correct and then establish the frame section for seismic interpretation.Applying section interpretation,coherent volume interpretation and three-dimensional visualization,this paper completed the detailed structural interpretation of research area.Based on the structural interpretation,applying various identification and interpretation technologies,we studied the lower-order faults of research area.Combined with the time-depth relationship of synthetic seismogram and seismic horizon as a means of horizontal restrain,this paper established the three-dimensional velocity model.By means of time-depth conversion,this paper drew structural maps of four horizons.On the basis of the results of structural interpretation,we studied the main fault characteristic,faults combination and structural style.Finally,based on the above research and combined with source-rock condition,features of reservoirs and cover rocks,fault activity and period,oil and gas accumulation models,this paper come up with three favorable area,such as Lu 22 area,Lu 65 area,Lu 59 area.