Synthetic Seismic Data Interpretation And Research On Structural Features In The North Of Beier Sag

Beier sag is a new generation of fault depression in south of Hailaer basin, It riches in oil and gas. However, the sag experienced much of tectonic movement and the different stress action, it formed the complex tectonic, well-developed faults and a variety of different reason oil generation systems, with complex hydrocarbon accumulation, exploration work has many difficulties. Therefore, based on interpretation of the high-precision three-dimensional seismic data, it will has a reality significance for petroleum exploration in the sag to research holistically and systematically characteristics and evolution of faults of paleogene, to research its control on hydrocarbon accumulation.In this thesis, on the basis of sequence stratigraphy theory, combined with well log and lithology, we can identify the bedding interface by the combination of seismic and well data, optimization of well well connected seismic profile to establish sequence stratigraphic framework. Using high-precision three-dimensional seismic data to synthetic seismograms as a bridge to achieve earthquake and geological horizon calibration and track horizon for the whole region. Combined time slice with coherence techniques to interpretation fault and combination of plane and profile, clarify the distribution of control trap and control fault in the different evolutionary stage of the study area, analysis the speed method of mapping to strike a relationship with depth and speed, ultimately achieve variable velocity mapping. On this basis, analysis tectonic features and tectonic style and obtained stretching, twist and inversion three tectonic style in the study area. We know that the formation of faults in this area have the obvious stages characteristic by analyzing the sequence boundaries, growth index, fault activity rate, and stretch, etc. Formation and evolution has gone through the early stretch, middle strike-slip and late inversion three stages, we pointed out that the formation and evolution of fault control of oil and gas.Finally, be based on the above conclusions, combination Beier sag oil and gas accumulation conditions including hydrocarbon source rocks analysis, interpretation of typical oil and gas reservoirs. The matching relation of faulting period and rock hydrocarbon-expulsion period is a closely accumulation important control factors. Through typical reservoirs anatomy, summarizes the hydrocarbon accumulation reservoir formation characteristics, analyzed the controlling factors, summarizes reservoir pattern, We believe that oil and gas main gathered in local structure development zone, and predict the beneficial hydrocarbon accumulation area.