Tectonic Interpretation And Seismic Reservoir Prediction Of The Shahejie Formation Of Gudao Salient

Guantao Formation of Gudao uplift is the main exploration oilfield,in the eastern slope,wells of Bo70 and Bo701 has found oil drilling in Shahejie Fm and Dongying Fm.Bo 701 well gained the high-yield industrial oil flow for 35.8 tons of in Es2 group,showing the exploration potential in Paleogene.As the new exploration targets,low level of exploration,little drilling,weak research base were the main problems for Gudao uplift.Geological-seismic studies,features structural of reservoir distribution were needed to provide geological basis for further exploration.The Shahejie formation,the target strata of the study area,overlapped on top of basement palaeo-uplift.The lack of significant wave impedance difference with the upper Dongying formation and the difficulty to identify the seismic reflection lines result two scientific and technical problems on the seismic recognition of isochronal strata interface.According to the issue,the Shannon Wavelet spectral decomposition method was proposed.The method can achieve accurate interpretation of the stratigraphic overlap line through the improvement of the seismic resolution.The seismic reflection of the top surface of the shahejie formation has a poor continuity and a lack of significant reflectors.The use of the method,frequency-division interpretation,can obtain the high-frequency seismic data,identify top interface of the shahejie formation,interpret the seismic recognition of isochronal strata interface.Meanwhile,based on the exploration necessity of the study area,the method of multiple attribute combination is used to rediscover the characteristics of the fault system and to support a more accurately structural understanding of the area.On the basis of structural interpretation,the paper analyzes macroscopic depositional environment.The paper uses Time–frequency analysis to analyze The ancient water environment.And use pagoda method to analyze ancient landform and sediment source.The come to a conclusion that Gudao uplift is the primary sedimentary provenances.Analyzed the isolated north fault,solitary central south fault and fault activity.The come to a conclusion that central fault is the main control factor of sediment distribution region in Gudao uplift;Use the method which is based on the waveform correlation analysis multiple attribute fusion to get the best reservoir characterization properties.Use seismic inversion to predict the sand reservoir in Es2 and Es3 s.Use the final inverse results to,and combine with earlier stage seismic attribute to summarize distribution of reservoir.On the basis of structural interpretation and reservoir prediction to put forward two favorable exploration targets.