Method for depth domain velocity modeling in desert area

A technology of velocity modeling and depth domain, which is applied in the field of oil and gas seismic exploration in complex desert areas, can solve the problems of high difficulty, low accuracy of velocity models in shallow, middle and deep layers, and rapid vertical and horizontal changes of velocity in shallow surface layers, so as to improve imaging Effects on quality, improved accuracy, and reduced exploration risk

Active Publication Date: 2019-04-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, in the processing of seismic data in desert areas, due to the undulation of surface dunes, the shallow surface velocity changes rapidly vertically and horizontally, making velocity modeling difficult.
In previous depth-domain velocity modeling in desert areas, the shallow surface velocity modeling was not targeted, the supporting technology for surface treatment was immature, and the accuracy of shallow, middle and deep velocity models was not high

Method used

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  • Method for depth domain velocity modeling in desert area
  • Method for depth domain velocity modeling in desert area
  • Method for depth domain velocity modeling in desert area

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Embodiment Construction

[0027] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0028] figure 1 It shows a schematic flow chart of a method for modeling depth domain velocity in a desert area according to an embodiment of the present invention. Such as figure 1 As shown, the method includes the following steps:

[0029] Step S100, establish a shallow depth domain velocity model.

[0030] The establishment of a shallow depth domain velocity model includes: large-scale smoothing of the surfa...

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Abstract

The invention discloses a method and device for depth domain velocity modeling in a desert area. The method comprises the following steps that a shallow superficial depth domain velocity model is established; a middle and deep depth domain velocity model is established; velocity fusion of the shallow superficial depth domain velocity model and the middle and deep depth domain velocity model is conducted to obtain a shallow, middle and deep integrated depth domain initial velocity model; and the shallow, middle and deep integrated depth domain initial velocity model is updated iteratively by using an isotropic tomography velocity inversion technology and anisotropy tomography velocity inversion technology. According to the method for depth domain velocity modeling in the desert area, a high-precision depth domain velocity model of the desert area can be obtained, and imaging quality of high-depth migration can be further improved.

Description

Technical field [0001] The invention relates to the technical field of oil and natural gas seismic exploration in complex desert areas, in particular to a method and device for speed modeling in the depth domain of desert areas. Background technique [0002] In the field of seismic exploration technology, the speed issue is the core issue of exploration seismology. The development of seismic exploration for decades is essentially based on the understanding of the velocity field of the underground medium. The degree of understanding of the velocity field basically represents the degree of understanding of the underground geology of an exploration area. On the one hand, because the seismic wave velocity of the underground medium is closely related to the physical properties of the rock, it can reflect the type of rock and the fluid (oil Or natural gas); on the other hand, the seismic wave velocity of the underground medium directly determines the results of seismic wave migration ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 杨威杨子川周刚李赋斌张庆马学军费建博
Owner CHINA PETROLEUM & CHEM CORP
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