Method and system for constructing space-variant wavelet bodies

Abstract

The invention discloses a method and system for constructing space-variant wavelet bodies. The method comprises the following steps that: seismic wavelets at various logging points in a target work area are obtained, wherein the seismic wavelets comprise first seismic wavelets of a logging point located at a geologic anomalous body development part, and second seismic wavelets of a logging point located at a non-geologic-anomalous-body development part; corresponding first space-variant wavelet bodies and corresponding second space-variant wavelet bodies are obtained based on the first seismicwavelets and the second seismic wavelets; a root-mean-square amplitude attribute graph reflecting the planar distribution of a geological anomalous body in the target work area is obtained, and amplitude value adjustment is performed, so that a first attribute constraint correction parameter corresponding to the first seismic wavelets and a second attribute constraint correction parameter corresponding to the second seismic wavelets are obtained; and calculation is performed based on the first space-variant wavelet bodies and the second space-variant wavelet bodies as well as the first attribute constraint correction parameter and the second attribute constraint correction parameter, so that attribute constraint-based space-variant wavelet bodies are constructed.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, in particular to a method and system for constructing a space-varying wavelet body. Background technique [0002] At present, in petroleum exploration and development, seismic inversion is the main method and means for reservoir lateral prediction. The inversion method used in seismic inversion is usually to calibrate the synthetic records of well logging data and side-hole seismic data to obtain seismic wavelets, and then deconvolute seismic data and seismic wavelets to obtain reflection coefficients, and then obtain wavelets. Impedance data. This inversion method is more suitable for reservoirs with relatively stable lateral development of geological bodies, but for reservoirs with strong lateral heterogeneity, such as carbonate reservoirs, even if more logs are set in the work area , it is difficult to obtain a stable seismic wavelet in the whole region by using this inversion method. ...

AI Technical Summary

Problems solved by technology

The existing space-variant wavelet extraction methods are basically based on spatial interpolation to obtain the space-variant wavelet body, but the limitation of this method is that the local correlation of synthetic record calibration in wells is high, and the spatial development of geological anomalies Insufficient consideration, based on the space-varying wavelet obtained by this method, the accuracy of the final seismic inversion result is low

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