Seismic Interpretation And Reservoir Prediction From Nantun Formation In Su20-1Region Of Northern Urxun Sag

The thesis directed by the theory of the sequence stratigraphy, the structural geology andthe prediction theory of seismic reservoir, using the comprehensive analysis of the seismicand the log data of Nantun formation in Su20-1region of Northern Urxun Sag, havecompleted the research of the tectonic evolution, the reservoir characteristics.In the research, with the understanding of Nantun formation in Su20-1region ofNorthern Urxun Sag, combining with the seismic date and well log date, using the syntheticseismograms for the bridge, completing tracking, contrasting and interpreting of threereflective interface of T22, T23and T3,drawing up the corresponding structural map on thebasis of the theory, and researching of the structural characteristics of the study area ofNantun formation preliminarily. According to the principles of the seismic fault interpretation,combining with the coherent body and3D visualization methods, the researches identify thefaults of Nantun formation to have the comprehensive analysis of structural characteristics ofSu20-1region.Though analyzing the structural characteristics, deposition setting and reservoircharacteristic of the study area, we do work of the inversion forecasting in Su20-1region. Onthe basis of data pretreatment, combining the curve sensitivity analysis, the thesis usefrequency compensation principle to curve reconstitution inversion in order to predict thefeature of the sand distribution. Through the study of seismic attributes, sand distribution,sedimentary characteristics and material property of Nantun formation, we can establish theresearch approach of reservoir prediction and predict advantageous well location.Studies have shown that the Su20-1region is influenced by slope belt of ShurennouerFault, the advantageous zones distribute in fault block trap, the degree of development of faulthave close relationship with sand distribution law. By the comprehensive analysis of thereservoir characteristics, abnormal area of seimic attributes is probably same as sandstoneresponse from curve reconstitution inversion, therefore, the advantageous reservoir distributein high value of effective sandstone thickness in this study area, and mainly in high part oflocal structure influenced by fracture.