Synthetic seismogram method and synthetic seismogram device

Abstract

The invention provides a synthetic seismogram method and a synthetic seismogram device, and relates to the field of seismic exploration. The method comprises the following steps: getting the stratum model, seismic wave frequency and seismic wavelet of a target work area, wherein the stratum model includes at least one type of interface, and there is at least one interface of each type; calculating the reflection coefficient of each stratum according to the stratum model and the seismic wave frequency, and getting a reflection coefficient matrix containing frequency-dependent reflection coefficients; calculating the synthetic seismogram spectrum of each moment according to the reflection coefficient matrix and the seismic wavelet; and carrying out Fourier inverse transform on the synthetic seismogram spectrum to get a synthetic seismogram of all moments. Both a conventional wave impedance interface of which the media on both sides are homogeneous isotropic media and a special interface of which the media on both sides are homogeneous anisotropic media can be calculated. A synthetic seismogram method applicable to unconventional oil and gas reservoirs such as thin or viscoelastic reservoirs is provided. A geological assurance is provided for accurate exploration and efficient development of oil and gas resources.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and device for synthesizing seismic records. Background technique [0002] Seismic records synthesized by convolution models play a very important role in seismic pre-stack and post-stack inversion. Conventional seismic pre-stack AVO inversion or post-stack wave impedance inversion are model-based inversions, the basis of which is to calculate seismic records through theoretical models, and this process is generally realized through convolution models. The convolution model assumes that the reflected wave amplitude is the result of convolution of the reflection coefficient with the wavelet. In a seismic record, the amplitude at each moment is formed by the interaction of many reflection coefficients and the convolution results of wavelets. The conventional convolution model is generally aimed at the wave impedance interface, and its reflection coefficient i...

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Problems solved by technology

[0004] However, when the reflection coefficient changes frequently, the conventional convolution model theory is no longer applicable, which directly leads to the inability of the conventional inversion method to be applied, and thus the research on thin layer thickness and formation viscoelastic parameters cannot be realized

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