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Multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization

A technology of reverse time migration and least squares, applied in the field of oil and gas geophysical prospecting engineering, can solve problems such as ignoring gradient and step size randomness

Active Publication Date: 2016-10-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the current phase-encoded LSRTM still uses the same deterministic optimal solution as the traditional LSRTM algorithm, such as the steepest descent method, conjugate gradient method, etc., ignoring the randomness of gradient and step size

Method used

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  • Multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization
  • Multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization
  • Multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization

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Embodiment 1

[0067] Taking the Marmousi model as an example to test the method of the present invention, the velocity field is as figure 2 As shown in (a), the corresponding disturbance model is as figure 2 As shown in (b), the quality factor model is as follows figure 2 (c) shown. from figure 2 It can be seen that the Marmousi model develops interrupted blocks and the speed changes drastically, which can be used to test the quality of the imaging algorithm. The model parameters are as follows: the horizontal grid points are 737, the grid spacing is 12.5m, the vertical grid points are 375, and the grid spacing is 8m. The calculation parameters are: 185 shots are evenly distributed on the surface at intervals of 50m, each shot is fully received by 737 receiver points, the main frequency of the source is 20Hz Leike wavelet, and the time sampling interval is 0.6ms.

[0068] image 3 is the imaging test result, where, image 3 (a) is the multi-source viscoacoustic LSRTM result obtain...

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Abstract

The invention provides a multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization. The multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization comprises the steps that 1, field observation record and preset parameter synthesized supergather are read; 2, by adopting a current reflection coefficient model, a data residual error is calculated through multi-seismic resource excitation forward modelling supergather; 3, an update gradient is calculated according to the data residual error; 4, according to a stochastic optimization idea, the gradient is modified, and an update step length is calculated; 5, the reflection coefficient model is updated through the gradient and the update step length. According to the multi-seismic resource sticky sound least square reverse time migration method based on stochastic optimization, the stochastic optimization idea is popularized to sticky sound least square reverse time migration of phase encoding, stochastic fluctuation of the gradient is reduced through the gradient obtained before weighted averaging is conducted, and a good effect is obtained.

Description

technical field [0001] The invention relates to the field of oil and gas geophysical prospecting engineering, in particular to a multi-source viscoacoustic least squares reverse time migration method based on stochastic optimization. Background technique [0002] The viscosity of actual underground media is ubiquitous, and the propagation of seismic waves in viscoelastic media is mainly manifested as velocity dispersion and amplitude attenuation. The prestack imaging algorithm that does not consider the viscosity will not only deviate the imaging position, but also cause underestimation of the imaging amplitude, seriously affecting or even misleading the subsequent seismic data processing and interpretation. With the deepening of oil and gas exploration and development, the requirements for exploration accuracy have gradually increased, and seismic wave imaging has gradually developed from structural imaging to lithological imaging. However, the current conventional migrati...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 张猛匡斌单联瑜赵庆国王慧隆文韬高丽王修银廉西猛王贤真李振春张传强陈震林
Owner CHINA PETROLEUM & CHEM CORP
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