Seismic Wave Attenuation and Velocity Dispersion Prediction Method in Complex Heterogeneous Reservoir Media

Abstract

The invention provides a seismic wave attenuation and velocity dispersion prediction method in a complex heterogeneous reservoir medium, which belongs to the field of hydrocarbon fossil energy exploration and development. The method includes: (1) carrying out a two-dimensional petrophysical modeling for the reservoir rock unit according to the lithology, fluid-bearing properties, and fluid saturation Sg of the heterogeneous reservoir medium; (2) obtaining the physical model in step (1). In modeling, a conventional two-dimensional seismic wave propagation simulation numerical experiment is implemented, and the propagation of elastic waves in the reservoir medium is realized by applying a point source, the stress field and velocity field of each time layer are obtained, and the strain field at any point in space is obtained. ; (3) When the conventional two-dimensional seismic wave propagation simulation numerical experiment is completed, record the time records of the stress field and strain field; (4) Calculate the average stress and strain fields of the REV element based on the macroscopic averaging principle, where ψ∈{τxx, τzz , εxx, εzz}.

Description

technical field [0001] The invention belongs to the field of hydrocarbon fossil energy exploration and development, and in particular relates to a method for predicting seismic wave attenuation and velocity dispersion in complex heterogeneous reservoir media, which is used to improve the technology and reliability of reservoir prediction and fluid identification. The invention is applicable to fields such as land or offshore oil and gas exploration and development, shale gas exploration and exploitation, coal bed methane exploration and exploitation, and carbon dioxide sequestration monitoring. Background technique [0002] In seismic exploration, artificially excited seismic waves propagate underground and arrive at geophones or sensors to be recorded. These wave field records carry response information related to underground geological structure, rock elastic properties and pore fluid properties. Seismic exploration workers use reasonable wave field propagation models and ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and to provide a method for predicting seismic wave attenuation and velocity dispersion in complex heterogeneous reservoir media. The theory of seismic wave propagation in the medium extracts two seismic attributes of seismic wave attenuation and velocity dispersion, which overcomes the shortcomings of the weak theoretical foundation encountered in the traditional use of seismic wave attenuation attributes to predict reservoir fluids

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