Underground velocity model building method

A technology of velocity model and construction method, applied in the field of oil and gas exploration and development, which can solve the problems of reducing practical value and inefficiency

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this type of technology requires multiple implementations of pre-stack depth migration and human-computer interaction to pick up common imaging point gathers, which makes this type of technology very inefficient in 3D and reduces its practical value to a certain extent.

Method used

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Embodiment Construction

[0043] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0044] The invention provides a method for constructing an underground velocity model, such as figure 1 As shown, the method includes:

[0045] Step S101 , acquiring a co-reflection bin superposition operator.

[0046] In the two-dimensional case, for a certain zero-offset sample point in the seismic data (ξ m ,T), where T represents the propagation time of the normal incident point wave, ξ m is the surfa...

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Abstract

The invention discloses an underground velocity model building method, and belongs to the technical field of oil and gas exploration and development. The process of pre-stack seismic event artificial/semi-automatic pick-up is avoided, and the building process of an underground velocity model is speeded up. The underground velocity model building method comprises the following steps: acquiring a common reflection surface stacking operator; acquiring the kinematic wave field attribute parameters of seismic wave according to the common reflection surface stacking operator; and building an underground velocity model based on a built regularization chromatography equation, the kinematic wave field attribute parameters and a built initial underground velocity model.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a construction method of an underground velocity model. Background technique [0002] Estimating the velocity distribution of subsurface medium (especially its low wavenumber part, also known as macroscopic velocity) is one of the core issues in seismic exploration. Imaging subsurface structure migration and predicting oil and gas reservoir parameters all rely on an accurate velocity model. Seismic tomography has high inversion accuracy and is an important method for estimating subsurface velocity models, among which reflection tomography is the most widely used. [0003] Reflection tomography has the advantages of high efficiency and easy implementation, but it needs to pick up events that are continuously distributed along the entire section on the prestack seismic gather. This operation is time-consuming (especially in 3D) and almost impossible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 倪瑶蔡杰雄
Owner CHINA PETROLEUM & CHEM CORP
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