Seismic data velocity model establishing method and device

A velocity model, seismic data technology, used in the field of oil exploration

Active Publication Date: 2015-12-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0007] The embodiment of the present invention provides a method and device for establishing a seismic data velocity model to solve the multi-solution problem in the wave equation-based modeling method in the prior art

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  • Seismic data velocity model establishing method and device
  • Seismic data velocity model establishing method and device
  • Seismic data velocity model establishing method and device

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Embodiment Construction

[0023] 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.

[0024] Considering that the existing wave equation-based modeling method has the above-mentioned multi-solution problem, and the underground structure and velocity are not completely random, but have certain rules, so geological conditions can be introduced as constraints (that is, layer bit information as a constraint) to adjust the modeling to solve the multi-solution problem existing in the prior art. Specifically, in this example, a method for establishing a seismic data velocity model is provided, such as figure 1 shown, including the following steps:

[0025] Step 101: determining the o...

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Abstract

The invention provides a seismic data velocity model establishing method and device. The method includes the following steps that: the objective function of a seismic data velocity model is determined; the gradient of the objective function is calculated based on horizon constraint; and the objective function is adjusted according to the calculated gradient, so that a post-adjustment velocity model can be obtained. According to the method provided by the embodiment of the invention, the horizon constraint is introduced in the computation of the gradient of the objective function, namely, constraint conditions are added, and therefore, the problem of multiplicity of solution in a wave equation-based modeling method in the prior art can be solved; and the gradient is determined based on the introduction of the horizon constraint, so that the finally-determined velocity model can contain horizon information, and thus, the obtained velocity model more accords with a geological structure.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and device for establishing a seismic data velocity model. Background technique [0002] Velocity modeling is a key step in the process of seismic data processing. The quality of the established velocity model will directly affect the final result of seismic data processing, that is, the quality of seismic planing. General velocity modeling methods can be divided into two categories: traditional modeling methods based on ray tracing (raytracing) and modeling methods based on wave equations. [0003] Among them, there is a modeling method based on ray tracing (Reflection Tomography, referred to as RT). Smooth, lacking detail. This shortcoming is mainly due to the following limitations of the ray tracing method: ray tracing itself is an approximate solution to the wave equation under the high frequency assumption (High frequency assumption), so there is a c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 章威
Owner BC P INC CHINA NAT PETROLEUM CORP
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