Seismic wave impedance inversion method based on frequency spectrum fusion

Abstract

The invention relates to a seismic wave impedance inversion method based on frequency spectrum fusion. Background field factors are extracted from well logging data to control an overall trend of inversion wave impedance; the frequency spectrum fusion is performed on low-frequency components of the well logging data and effective frequency-band components of seismic data; and an in-well wave impedance curve is extended to an overall seismic cross section under the restriction of the seismic data. The frequency spectrum fusion is performed on the well logging data and the seismic data, the background field factors are introduced to control the overall trend of the inversion wave impedance and the in-well wave impedance curve is extended to the overall seismic cross section under the restriction of the seismic data. Basic characteristics (fault, occurrence) of seismic reflection are relatively completely retained without a general problem of multiplicity in solutions on the basis of a model inversion algorithm so that spatial variation in lithofacies and lithology can be obviously reflected, and thus the method has characteristics of being rapid in calculating speed, great in stability, high in calculating accuracy and high in anti-noise capacity.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and particularly relates to a seismic wave impedance inversion method based on spectrum fusion. Background technique [0002] Seismic exploration technology is one of the most widely used geophysical methods in oil and gas exploration. It uses the changes in parameters such as velocity, amplitude, frequency, phase, and waveform of seismic waves propagating in different media to analyze and predict the distribution range of oil and gas reservoirs. Layer physical properties. With the gradual deepening of the degree of exploration and development, seismic exploration has gradually developed from structural exploration to understand the subsurface structural form to lithology exploration that directly uses seismic information to judge lithology, analyze lithofacies, and quantitatively calculate physical parameters of rock formations. Reservoirs in these complex depositional environment...

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Problems solved by technology

[0007] In order to solve the above-mentioned problems, the purpose of the present invention is to address the shortcomings of the existing seismic inversion technology in reservoir prediction, such as the limited bandwidth of seismic data and the multiple solutions in seismic inversion, slow inversion calculation speed, and inability to To deal with real-time interpretation of large data volumes, provide a seismic wave impedance inversion method based on spectrum fusion, make full use of the effective frequency bands of seismic data and well logging data, improve the anti-noise ability of the inversion method, and convert the obtained wave impedance information It is used for lithological parameter interpretation of seismic data, which is convenient for fine reservoir description, and provides reliable data for finding lithologic (and stratigraphic) trap reservoirs and unconventional reservoirs (coalbed methane, shale gas, etc.)

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