Seismic wave attenuation and speed dispersion prediction method in complex heterogeneous reservoir medium

Abstract

The invention provides a seismic wave attenuation and speed dispersion prediction method in a complex heterogeneous reservoir medium and belongs to the hydrocarbon fossil energy exploration and development field. The method comprises the following steps of (1) according to lithology, a fluid containing property, a fluid saturation Sg of the heterogeneous reservoir medium, carrying out two-dimensional rock physical modeling on a reservoir rock unit; (2) implementing a conventional two-dimensional seismic wave propagation simulation numerical experiment on a physical modeling acquired from the step (1), through applying a single source, realizing propagation of an elastic wave in the reservoir medium, acquiring a stress field and a speed field of each time layer and calculating a strain field of any one point in a space; (3) when the conventional two-dimensional seismic wave propagation simulation numerical experiment is completed, recording time records of the stress field and the strain field; (4) based on a macro average principle, calculating an average stress and a strain field of an REV unit, wherein psi belongs to {tauxx, tauzz, epsilonxx and epsilonzz}.

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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