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Velocity Inversion Method Based on Vertical and Horizontal Space Constraints

A space-constrained, velocity inversion technology, applied in seismic signal processing and other directions, can solve problems such as difficulty in obtaining inversion results, and achieve the effect of improving accuracy

Active Publication Date: 2021-06-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Because the commonly used velocity inversion method is difficult to obtain reasonable inversion results in data with sudden changes in velocity in areas with complex structures, the work of interpretation requires a velocity inversion method that can solve various complex structures

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  • Velocity Inversion Method Based on Vertical and Horizontal Space Constraints
  • Velocity Inversion Method Based on Vertical and Horizontal Space Constraints
  • Velocity Inversion Method Based on Vertical and Horizontal Space Constraints

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Embodiment Construction

[0028] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0029] Velocity mutations often occur in complex structural regions. Because the velocity field obtained by conventional velocity inversion algorithms has a certain average effect, it is difficult to reflect the velocity mutations in common velocity inversion methods. This problem can be solved if the boundary of velocity mutation can be artificially controlled to achieve subregional inversion of velocity. Different subsurface regions can be distinguished by using interpreted horizons and faults, and vertical partition boundaries can be established using layered data from well logs. And the average velocity value of each layer can be calculated by using the logging data, and the background velocity of the sub-area can be established. On this basis, th...

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Abstract

The present invention provides a velocity inversion method based on vertical and horizontal space constraints. The velocity inversion method based on vertical and horizontal space constraints includes: step 1, establishing an initial velocity model, and performing migration imaging; step 2, performing imaging results Carry out analysis, use the existing logging data to analyze the depth domain error; step 3, establish the basic structural control model of the target layer; step 4, on the basis of structural interpretation, use the well data corresponding to the target layer to describe the velocity, Establish a relatively accurate velocity model for the target layer; Step 5, use structural interpretation and logging interpretation information to establish a velocity model; Step 6, use the stochastic velocity inversion method controlled by well data to perform velocity inversion of the target layer. The velocity inversion method based on vertical and horizontal space constraints adopts the velocity inversion method based on the amplitude information of actual seismic records and the distribution probability of well velocity, which can better solve the velocity inversion problem in various complex areas.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration seismic data processing, in particular to a velocity inversion method based on vertical and horizontal space constraints. Background technique [0002] Velocity plays an important role in seismic data processing. There are many commonly used velocity inversion methods, such as velocity analysis, tomographic velocity inversion, logging velocity interpolation, and full waveform inversion. The commonly used velocity analysis method obtains the root mean square velocity, and the obtained velocity is based on the velocity analysis results obtained under the assumption of a horizontal layered medium. The tomographic velocity depends on the picked-up effective wave travel time, and the reliability of the inversion results is poor in the velocity mutation region. The method of well logging velocity interpolation depends heavily on the distribution of well logging, and the velocity results...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 李凌云张云银傅金荣陈震林孙治国董月昌王蓬
Owner CHINA PETROLEUM & CHEM CORP
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