Angle gather seismic response numerical computation method of reservoir fluid fluidity

Abstract

The invention discloses an angle gather seismic response numerical computation method of reservoir fluid fluidity, and relates to a petroleum seismic exploration data processing and explanation technology. According to the angle gather seismic response numerical computation method of reservoir fluid fluidity, pre-stack angle gather seismic normalization of reservoir fluid fluidity is achieved. First, on the basis of petrophysics and the theory of elasticity of holes containing fluid mediums, frequency relevancy longitudinal wave and transverse wave speed parameters of all the segments or layers of log data or a synthetic geologic model, and a reservoir physical parameter geologic model containing different levels of fluid fluidity is obtained; second, a two-dimensional angle and frequency domain AVO seismic reflection coefficient distribution formula is utilized for obtaining an incident angle and frequency domain AVO reflection coefficient distribution model changing along with the incident angle and the frequency at the same time; third, a scalar diffusion viscosity equation is used for performing forward calculation of a seismic wave field to obtain pre-stack angle gather data. The angle gather seismic response numerical computation method of reservoir fluid fluidity can be used for describing influences of reservoir fluid fluidity on a pre-stack angle gather seismic response and the corresponding relation between the reservoir fluid fluidity and the pre-stack angle gather seismic response, and provides more reliable guidance for recognition of oil gas in reservoirs in oil gas seismic exploration.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation. It is a method of using rock physics, poroelasticity theory of fluid-containing medium and wave equation method to realize pre-stack angle gather seismic forward modeling of reservoir fluid fluidity, which is used to describe The seismic response characteristics and laws of fluid-bearing reservoir mobility on pre-stack angle gathers provide guidance for reservoir fluid identification in oil and gas seismic exploration. Background technique [0002] Reservoir fluid mobility is a physical parameter reflecting fluid mobility in porous media, defined as the ratio of reservoir permeability to pore fluid viscosity, which reflects the permeability (or connectivity) and pore structure of the pore structure in the rock skeleton of the reservoir. Fluid type, viscosity, and saturation. Therefore, reservoir fluid mobility is of great significance for determining...

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Problems solved by technology

[0004] Due to the interrelated and complicated interaction between the reservoir fluid mobility and the variation of seismic amplitude with offset (namely, Amplitude Versus Offset—AVO), it shows unique characteristics in the pre-stack angle gather of oil and gas reservoirs. Seismic response characteristics and laws, however, how to simulate and characterize the seismic response of reservoir fluid mobility on the pre-stack angle gathers, there is still a lack of systematic numerical calculation methods, and this is the study of reservoir fluid mobility in the pre-stack angle gathers The seismic anomaly characteristics such as dispersion and attenuation on the seismic prestack angle gather guide the inversion of reservoir fluid mobility parameters on the actual seismic prestack angle gather, and realize the important basic work of reservoir description and fluid detection

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