Blind inversion method and device

Abstract

The invention discloses a blind inversion method and device. The method comprises the following steps: determining a reflection coefficient matrix of the seismic record by utilizing sparse pulse inversion; converting the reflection coefficient matrix into a reflection coefficient vector; respectively converting the constructed first-order difference matrix and the constructed second-order difference matrix on the time dimension, the line dimension and the channel dimension into a total variation regularization matrix and a Tikhonov regularization matrix; constructing a target function of waveimpedance according to the reflection coefficient vector, the total variation regularization matrix and the Tikhonov regularization matrix, wherein the wave impedance comprises transverse abrupt change wave impedance and transverse gradual change wave impedance; and determining the wave impedance of the seismic record according to the transverse abrupt change wave impedance and the transverse gradual change wave impedance when the target function obtains the minimum value. According to the method, regularization constraint is carried out on the transverse abrupt change wave impedance and the transverse gradual change wave impedance through total variation regularization and Tikhonov regularization respectively, the wave impedance is solved through the constructed target function, and the continuity of transverse energy of the wave impedance can be improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploration, in particular to a blind inversion method and device. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Wave impedance inversion actually eliminates the influence of wavelets from the seismic section, leaving the reflection coefficient, and then calculates the physical parameter wave impedance that can reflect the change of formation physical properties from the reflection coefficient. Acoustic impedance inversion is very important in the field of seismic exploration, widely used in seismic interpretation and reservoir prediction, and has also been well applied in rock physics. [0004] The problem of wave impedance inversion usually involves the problem of deconvolution. The ...

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Problems solved by technology

However, due to the uncertainty of the wavelet, the reflection coefficient has poor continuity in the transverse direction, and the recursive process is often very sensitive to noise interference, so that the wave impedance after inversion has large energy changes and poor continuity in the transverse direction The problem of "noodles" will appear on the seismic wave impedance profile, which is not conducive to reservoir prediction and analysis

[0005] Therefore, the existing wave impedance inversion has the problem of poor continuity of wave impedance transverse energy

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