Salt dome velocity density estimation method based on direct envelope inversion in angle domain

A technology of density estimation and angle domain, which is applied in the field of geophysical exploration and can solve the problems of difficulty in density estimation and serious mutual influence.

Active Publication Date: 2020-09-25
XIAN UNIV OF TECH
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Problems solved by technology

However, although full waveform inversion has the ability to estimate various formation parameters, accurate density estimation is very difficult, because the response of velocity and density to the wave field is coupled with each other, and density inversion is limited by velocity inversion. , and for strong scattering models involving large-scale salt domes, the interaction between the two becomes more severe

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  • Salt dome velocity density estimation method based on direct envelope inversion in angle domain
  • Salt dome velocity density estimation method based on direct envelope inversion in angle domain
  • Salt dome velocity density estimation method based on direct envelope inversion in angle domain

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] The method for estimating the velocity density of salt domes based on direct envelope inversion in the angle domain in the present invention, such as figure 1 As shown, the specific steps are as follows:

[0067] Step 1. Set the shot point and receiver point, and collect the original seismic data to obtain the observation data u obs (t,x r ; x s ), and perform conventional preprocessing on the acquired seismic data, including dynamic and static correction, noise elimination, etc., to obtain the pre-stack shot seismic data d obs (t,x r ; x s ), where t represents the time variable and x r ,x s are the positions of the receiver point and the shot point, respectively;

[0068] Step 2. Construct a rectangular grid geological model, set the model size Nx×Nz according to technical indicators and requirements of the work area, and set...

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Abstract

The invention discloses an angle domain direct envelope inversion-based salt dome velocity and density estimation method. The method specifically comprises the steps of 1, setting a shot point and a demodulator probe, and carrying out acquisition to obtain observation data; 2, constructing a rectangular net geologic model; 3, giving a to-be-optimized target function Je(v(x), Rho(x)) in a direct envelope inversion stage; 4, giving a scattering angle range for velocity long-wavelength velocity component inversion; 5, optimizing the target function Je(v(x), Rho(x)) through direct envelope inversion and an iterative optimization algorithm so as to obtain a long-wavelength component vl(x) of a velocity model; 6, giving a new to-be-optimized target function J(v(x), Rho(x)) in the next stage; 7,optimizing the target function J(v(x), Rho(x)) through a steepest descent method so as to obtain a refined velocity structure vf(x); 8, giving a scattering angle range for density inversion; and 9, further optimizing the target function through the steepest descent method so as to obtain a refined density structure Rho f(x). The method is capable of using new Frechet derivatives in direct envelopes to carry out energy propagation.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a salt dome velocity density estimation method based on angle domain direct envelope inversion. Background technique [0002] Oil and natural gas are important strategic resources related to national economic development and national security. With the development of the petroleum industry and the deepening of exploration and development, the exploration difficulty gradually increases from the stage of structural exploration to the stage of lithology exploration. In order to meet this requirement, full waveform inversion has developed rapidly and has become a research hotspot in the field of geophysics today. Full waveform inversion is an effective method to estimate formation parameters. It can not only provide high-resolution and high-precision velocity models for seismic imaging, but also has the ability to invert various parameters simultaneously. ...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor罗静蕊王婕
OwnerXIAN UNIV OF TECH