The Elastic Response Simulation And Fault Identification Of Fractured-Cavity Reservoir

With the development of oil and gas exploration technologies and the increasing demand for oil,instead of the exploration of traditional simple structural oil and gas reservoirs,the oil and gas industry has gradually focused on the exploration of more complex lithologic oil and gas reservoirs.Due to the deeply buried oil and gas reservoirs and strong heterogeneity,it is difficult to identify and evaluate carbonate reservoirs from the logging and seismic data.An effective method in this paper can provide technical support for the identification and evaluation of the fractured-cavity reservoirs.It has very important theoretical significance and practical application value.This paper has carried out following researches.Firstly,the fractured-cavity medium model and the complex fracture model with different pore geometries and inclusions are established.Secondly,using the SCM to calculate the P-wave and S-wave velocity of the fractured-cavity reservoirs and the fracture zones.Thirdly,using the velocities and the high-order staggered-grid finite difference numerical simulation method to calculate the elastic wave field,and then study the influence of different pore geometries and inclusions on the elastic response of fractured-cavity reservoirs.In addition,based on the analysis of the migration results,study the effects of different fragmentation patterns and combination styles on seismic wave field and migration results.Because of the multi-type noise in practical seismic data,a three-dimensional strike-slip fault model was established to test the effectiveness of the structure guided filtering method in denoising and maintaining the edges of the fault zone.Finally,an effective method is applied to the practical seismic data from an oil field in Northwest China and the effectiveness in identifying fractured-cavity reservoirs is preliminarily confirmed.