Well-constrained two-dimensional seismic variable velocity field nonlinear error correction method

An error correction and field nonlinear technology, which is applied in the field of oil and gas exploration, can solve problems such as inevitable errors, impact on structural map accuracy, unfavorable exploration, etc., to achieve the effects of reducing errors, solving complex underground structures, and improving mapping accuracy

Inactive Publication Date: 2015-06-03
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Since it is an interpolation, there are inevitable errors between the obtained results and the actual situation, especially for areas with complex structures, such as figure 2 As shown, due to the existence

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  • Well-constrained two-dimensional seismic variable velocity field nonlinear error correction method
  • Well-constrained two-dimensional seismic variable velocity field nonlinear error correction method
  • Well-constrained two-dimensional seismic variable velocity field nonlinear error correction method

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[0068] 1. Establishment of seismic trace velocity field

[0069] Regardless of whether the exploration degree is high or low, the superimposed velocity field is first established.

[0070] 1.1. Improve the seismic superposition velocity in the area with poor seismic data quality:

[0071] For areas with poor seismic section quality, the superimposed velocity of adjacent grid points with poor reflection can be derived recursively through the superimposed velocity interpolation (cubic spline interpolation method) of the seismic section with better seismic wave reflection;

[0072] 1.2. Correction and improvement of seismic superposition velocity in areas without seismic data or grid points:

[0073] For areas or grid points with no survey line or no seismic data, the superimposed velocity at the no survey line or corresponding grid point can be deduced by interpolation of the superimposed velocity on the seismic survey line with better seismic data quality.

[0074] Polynomial...

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Abstract

The invention discloses a well-constrained two-dimensional seismic variable velocity field nonlinear error correction method which comprises the following steps: 1, performing deduction and conversion to improve and correct stack velocities of a poor data quality section and a seismic data-free section in a two-dimensional work area, and performing polynomial fitting on all the stack velocities on grid points to establish an initial stack velocity field; 2, generating an average wellhead velocity; 3, constructing an error function, namely making an error curve of a well side stack velocity and the average wellhead velocity, and an error curve of the well side stack velocity and a non-well side seismic channel stack velocity; 4, performing error correction on the seismic stack velocities in the grid points to establish a more reasonable and more accurate variable velocity field by taking nonlinearly variable function values obtained in step 3 as correcting values; 5, performing time-depth conversion on an interpretation time horizon to realize variable velocity mapping by utilizing a corrected variable velocity average velocity model. According to the method, errors of the variable velocity field are favorably reduced, so that the variable velocity mapping accuracy is improved.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration, and relates to a nonlinear error correction method for a well-constrained two-dimensional seismic variable velocity field. Background technique [0002] Seismic velocity is one of the most important parameters in seismic exploration. Establishing a variable velocity field and realizing the variable velocity mapping in the time-depth conversion is one of the important methods to obtain the final results of seismic exploration, and one of the important changes brought by the development of computer software and hardware technology to the structural mapping. In the traditional construction of graphs, in order to reduce the workload, a region often only uses a speed ruler (that is, all points use a time-depth conversion ruler) for time-depth conversion. Obviously, there are errors between the obtained results (stratum burial depth, etc.) and the actual situation. For areas with complex structu...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 林年添贾凌云王焕军杨修超张建彬张栋李桂花丁仁伟赵俐红
Owner SHANDONG UNIV OF SCI & TECH
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