Research On A New Technique Of Large-Scale Seismic Physical Simulation Experiment And Its Application To Seismic Prediction Of Pore-Fluid Saturated Reservoir

Seismic physical simulation technology as an important experimental method in the field of geophysical exploration plays an irreplaceable role in the development of geophysical exploration technology,and is the basis of improving the level of industrial technology.This paper focuses on the exploration needs of lithology,foreland,deep,unconventional and offshore fields,and on the basis of investigation of seismic physics simulation laboratories at home and abroad and their research directions,Use and solid surface seismic physical simulation technique,the time-varying gain amplification sampling technology,more order differential extension frequency,two phase medium model,high temperature and high pressure multiphase flow quantitative filling seismic physical simulation technology,gas floating and positioning control technique,high resolution raster and multi-channel high efficiency wide azimuth acquisition technology,3D printing molding technology,etc.,Research and development of a new generation of large scale high precision seismic physical simulation experiment system with high efficiency,realize the irregular surface land,sea and multiphase medium model omni-directional,high resolution and high fidelity seismic acquisition and response mechanism simulation,better support field acquisition scheme design(surface)imaging and complex structure,strong heterogeneity reservoir quantitative interpretation.Based on research and development of seismic physical simulation experiment system,this paper carried out the 3D seismic responses of the two phase fluid saturated porous medium physical simulation research,reflect the feature of the reservoir cap in the pearl river mouth basin,deep water area is constructed,lithologic combination,sand body distribution,pore fluid properties of 3D geological and geophysical characteristics,such as large scale physical model,Factors such as seafloor shape,distribution of soft mud layer,physical properties of sandstone reservoir and fault development are fully considered in the model.Then,based on the physical model,the multi-channel,multi-azimuth,high-precision 3D seismic data acquisition is carried out under different surface conditions.The seismic data obtained by different acquisition methods are compared and analyzed.The results show that the geological body imaging results based on the wide azimuth seismic data are more accurate.Both wide azimuth and narrow azimuth data can reflect the change of reservoir physical properties.Both wide azimuth and narrow azimuth data can reflect the change of gas saturation(oil density)to a certain extent.When the lens boundary is perpendicular to the acquisition direction,the image of the lens boundary is clearer.In addition to baiyun deep-water area physical model and acquisition of seismic data,by using the reflection of waveform characteristics analysis,horizon tracking interpretation,reservoir parameter analysis,post-stack attribute analysis,wave impedance inversion after stack and pre-stack AVO analysis and pre-stack elastic parameters inversion technology,such as testing the different lithology,physical property,lithology combination and different seismic response characteristics of the reservoir saturation flow condition,The influence of different seismic acquisition methods on reservoir characterization was analyzed,and the influence of fluid types on reservoir reflection characteristics was clarified.The seismic acquisition and processing methods in the deep water area of the Pearl River Mouth Basin were optimized,which effectively guided the technical process of high quality reservoir prediction in this area,and achieved good application effect.The seismic physical simulation experimental system developed in this paper can realize large-scale,high-precision physical model positioning,multi-channel,high efficiency,high signal-to-noise ratio,deep weak signal acquisition,broadband,high-resolution ultrasonic signal acquisition,high-precision model shape scanning and other functions.In different surface conditions(mountains,deserts,swamps,ocean,etc.),different ways of collection(excitation,arrangement,combination),different types,conventional and unconventional reservoir and seismic acquisition of temperature,pressure conditions and earthquake response mechanism,to improve the efficiency of seismic exploration,exploration seismic imaging and quantitative interpretation method,Power seismic exploration theory research and provide a scientific basis for the actual production use,enriched and developed the seismic physical simulation technology,to support the scientific research production and the theory exploration technology research is of great significance,to design more economic,scientific and feasible provided experimental data collection and observation systems,has a certain practical popularize value.