AVO (Amplitude Versus Offset) approximate formula based on incidence angle and attribute extraction method

Abstract

The invention provides an AVO (Amplitude Versus Offset) approximate formula based on an incidence angle and an attribute extraction method. The attribution extraction method comprises the following steps of: (1) proposing the AVO approximate formula based on the incidence angle; (2) carrying out theoretical derivation of the AVO approximate formula based on the incidence angle; (3) extracting the attributes of P, G and Rs by applying a conventional method; (4) uniformizing the attributes; (5) determining a b value through well data or an empirical formula of a study area, and then correcting the attributes extracted by the conventional method by applying a formula (14) and a formula (15); (6) comparing and animalizing a correction result and the well data, and correcting the correction result according to an analysis result to obtain a final attribute result. The invention has convenient and accurate calculation and small actual parameter error.

Description

Technical field The invention relates to the field of seismic data processing, and relates to a method for identifying reservoirs using seismic data. Background technique AVO technology is a technology to directly predict oil and gas and estimate crustal lithology parameters according to the subsurface lithology and pore fluid properties reflected by the variation of amplitude with offset. Its theoretical basis is the Zoeppritz equation describing the reflection and refraction of plane waves on horizontal interfaces. The complete Zoeppritz equation has complex form and unclear physical meaning, so it cannot be directly applied to seismic data processing and parameter inversion. Although this has long been recognized, in earlier studies various discussions and approximations of the reflection coefficient described by Zoeppritz have been made only from a numerical point of view. Muskat systematically calculated the reflection and transmission coefficients of plane waves in e...

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Problems solved by technology

However, the angles in all approximate formulas are the average of the applied upper incident a

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