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An adaptive weighted sirt inversion method and system in seismic tomography processing

An adaptive weighting, tomography technology, applied in the field of geophysical exploration, can solve the problems of limited number of shot points, uncorrected grid slowness, adverse effects of seismic tomography, etc.

Active Publication Date: 2011-11-30
PETROCHINA CO LTD
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Problems solved by technology

In addition, due to the limited number of offset points set in the process of seismic tomography, there will be many grids without rays passing through
These grids without rays passing through, the grid slowness cannot be corrected during the inversion process, which will have a great adverse effect on the seismic tomography effect

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  • An adaptive weighted sirt inversion method and system in seismic tomography processing
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  • An adaptive weighted sirt inversion method and system in seismic tomography processing

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[0078] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0079] As mentioned above, since the actually acquired shock wave travel time data will be disturbed by noise, it is not appropriate for the SIRT inversion method in the existing seismic tomography processing to correct the model parameters by taking the average weight value of each ray. reasonable. Because the travel time of a longer ray path will be subject to more noise interference, the correction value generated by the equation corresponding to this ray should be given a smaller weight; on the contrary, the travel time data corresponding to a shorter ray path will be more reliable, and sho...

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Abstract

The invention provides an adaptive weight SIRT (Simultaneous Iterative Reconstruction Techniques) inversion method in earthquake chromatography imaging processing and a system thereof. According to a weight correction part added in a grid slowness correction value iterative computation formula in the invention, correction based on a ray length is provided for the grid slowness correction value, an error problem of different introducing time-traveling errors because of different ray lengths is solved. Through employing a weight power exponent h calculating formula based on a ray density to weight power exponent h in a weight factor pi calculating formula, grid slowness correction value cj can obtain different degrees of weight correction according to different grid ray densities. Through adding an interpolation calculating module and a smooth processing module in a slowness value calculating unit, each grid slowness value result is subjected to interpolation calculation and smooth processing, thus an earthquake chromatography imaging result is more reasonable.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to an adaptive weighted SIRT (simultaneous iterative reconstruction techniques) inversion method and system in seismic tomography processing. Background technique [0002] The ray tracing technology based on Fermat principle and Huygens-Fresnel principle has been widely used in seismic tomography processing technology. This technology adopts the travel time linear interpolation ray tracing forward algorithm based on ray theory, through the analysis of the observed seismic wave travel time data, and then inverts a part of important information such as the structure and velocity distribution of the underground medium covered by a large number of rays. a geophysical method. [0003] figure 1 It is a flowchart of the seismic tomography processing method. As shown in the figure, the seismic tomography processing method can be divided into the following four steps: firs...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 徐凌胡英张才
Owner PETROCHINA CO LTD
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