AVAF simulation method and apparatus based on multi-scale rock physical model

Abstract

The embodiment of the application provides an AVAF simulation method and apparatus based on a multi-scale rock physical model. The method comprises: determining a periodic layered plaque saturated medium model of a reservoir stratum and determining an improved rock matrix modulus of a microscopic jet flow model of the reservoir stratum; substituting the improved rock matrix modulus into the periodic layered plaque saturated medium model to obtain a multi-scale rock physical model of the reservoir stratum; determining a reservoir medium parameter value of the reservoir stratum and a seismic wave dispersion parameter value of the multi-scale rock physical model and establishing a layered media model containing a velocity dispersion interlayer; and carrying out frequency-domain seismic forward modeling on the layered media model with the velocity dispersion interlayer to obtain a frequency-dependent seismic response characteristic of the layered medium model with the velocity dispersion interlayer. Therefore, accurate rock elastic characteristics and seismic response characteristics of tight sandstones can be obtained.

Description

technical field [0001] The present application relates to the technical field, in particular to an AVAF (Amplitude Versus Angle and Frequency, amplitude varies with incident angle and frequency) simulation method and device based on a multi-scale petrophysical model. Background technique [0002] Oil and gas identification using seismic wave dispersion and attenuation characteristics has become a hot and difficult research topic in the field of geophysical exploration in recent years. When seismic waves propagate in subsurface heterogeneous media, they will cause stress changes and pressure gradients, and cause fluid flow, resulting in velocity dispersion and attenuation. In fluid-saturated porous media, the fluid flow caused by microscopic, mesoscopic, and macroscale heterogeneity is considered to be the main controlling factor that causes the velocity attenuation and dispersion characteristics of seismic waves. However, the scales of wave-induced currents that cause veloc...

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Problems solved by technology

However, the frequency band that causes the dispersion and attenuation of elastic waves is very wide (from several Hz to several kHz), and the signal frequency ranges used by different geophysical measurement methods are different, resulting in different dispersion and attenuation mechanisms

In addition, tight sandstone has complex pore structure, non-uniform distribution of fluid, and strong heterogeneity, and the wave-induced flows of different scales that cause elastic wave dispersion are not completely independent.

[0004] In short, the application of existing seismic rock physics technology is limited by the data matching problem between different frequency bands, and the obtained results are difficult to accurately describe the elastic properties of tight sandstone rocks

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