Research On The Relation Between Reservoir Parameters Of Equivalent Media And Seismic Attributes

Seismic rock physics and seismic wave field forward modeling are important means to establish the relationship between reservoir characteristic parameters and seismic attributes.Seismic attributes extracted from seismic data can be used to study reservoir material information implied in seismic data.With the development of seismic attribute extraction and analysis technology,it is found that the seismic attributes are related to the reservoir lithology,porosity,shale content and other reservoir characteristics,which provides a theoretical basis for analyzing the relationship between reservoir characteristic parameters and seismic attributes.This paper studies the equivalent medium rock physics model based on reservoir characteristic parameters,and establishes the seismic wave field numerical simulation method with reservoir characteristic parameters by the angle domain recursion formula.It's the basis for studying the theoretical relationship between reservoir characteristic parameters and seismic attributes.Firstly,the iterative calculation equation of the KT equivalent model is improved by the mechanism of the Kuster-Toks?z(KT)equivalent model.The experimental measurement data and actual logging data verify the validity and rationality of the improved KT equivalent model rock elastic modulus calculation method.Secondly,deducing the wave field recursive formula of layered medium based on the wave theory.By analyzing the time difference factor in the wave field recursive formula of layered medium,the normal time difference correction of the phase-axis of the reflected wave in the angular domain is realized,and the angle domain common imaging point gather forward modeling method is improved.Finally,using the iterative calculation method of the improved KT model and the angle domain common imaging point gather forward modeling method,the angular physics forward modeling and seismic attribute extraction test of rock physics data are carried out,and the variation law between reservoir characteristic parameters which include the mudstone content,porosity,fluid saturation and pore aspect ratio and seismic attributes are analyzed.Through the research in this paper,a set of method flow from reservoir characteristic parameters to seismic wave field forward modeling to seismic attribute analysis is formed.The research results are powerful in seismic attribute optimization and reservoir characteristic parameter inversion.