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Speed smoothing method and system of construction constraint

A smooth and structural technology, applied in the research of migration velocity modeling and geophysical exploration, can solve the problems of complex structure, failure to reflect the change trend of geological structure, and affect pre-stack depth migration, etc., and achieve the effect of eliminating outliers

Active Publication Date: 2018-10-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, in some exploration areas with low signal-to-noise ratio of seismic data, or exploration areas with complex structures, the velocity model established by tomographic inversion often cannot reflect the changing trend of geological structures, thus affecting the effect of pre-stack depth migration

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  • Speed smoothing method and system of construction constraint
  • Speed smoothing method and system of construction constraint
  • Speed smoothing method and system of construction constraint

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Embodiment Construction

[0023] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein.

[0024] The invention proposes a structure-constrained velocity smoothing technology for problems such as complex structures, low signal-to-noise ratio seismic data, low velocity modeling accuracy, and velocity models that often cannot reflect the changing trend of geological structures.

[0025] The invention provides a velocity smoothing method constrained by structure, the method comprising: picking a structure horizon; determining a weighted smoothing factor; and performing smoothing processing of a velocity model constrained by the structure by using the weighted smoothing factor.

[0026] Specifically, the structural horizon...

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Abstract

The invention provides the speed smoothing method and system of a construction constraint. The method comprises the following steps of picking a construction level; determining a weighted smoothing factor; and using the weighted smoothing factor to carry out the smoothing processing of the construction constraint on a speed model. In the invention, firstly, the construction level is picked on a seismic profile, and then, along the level, weighted average filtering is performed on speed data in a rectangular window, and the vertical and horizontal smoothing degrees of the speed model are controlled through vertical and horizontal weighting factor parameters. Due to the constraints of the construction level, the smoothed speed model can basically reflect the changing trend of geological construction.

Description

technical field [0001] The present invention relates to the field of geophysical exploration, more specifically, to the research field of migration velocity modeling. Through the constraints of geological structure horizons, the smoothed velocity model is closer to the geological structure, so the result of migration imaging is more reasonable. Background technique [0002] At present, there are many methods for speed smoothing, the most commonly used methods are: median filtering method, Gaussian smoothing method and moving average method, etc. These methods only consider the characteristics of the data itself, and use statistical methods to remove the noise in the data , without considering the constraints of geological structure. [0003] Whether it is pre-stack depth migration or pre-stack inversion, an accurate velocity model is required, and the velocity model must reflect the changing trend of the geological structure. However, in some exploration areas with low sign...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 周巍胡光辉张兵
Owner CHINA PETROLEUM & CHEM CORP