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Full-automatic three-dimensional tomography inversion method using a local event slope

An event axis slope, tomographic inversion technology, applied in the field of automatic stereo tomographic inversion, can solve problems such as low efficiency and reduce practical value, and achieve the effects of high precision, shortening processing cycle, and improving efficiency

Active Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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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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  • Full-automatic three-dimensional tomography inversion method using a local event slope
  • Full-automatic three-dimensional tomography inversion method using a local event slope
  • Full-automatic three-dimensional tomography inversion method using a local event slope

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0053]The present invention belongs to the tomographic imaging technology under the framework of the linearized inversion theory. Its main technical content and process are as follows: firstly, the structure tensor analysis is used on the common shot gather, common receiver gather and common offset gather. Technically calculate the event slope, and automatically filter out the data points that meet the requirements according to the quality monitoring condition of "event slope coordinate transformation identity" on the three gathers, and use it as the inversion data input; then the initial model is given Parameters, perform ray tracing forward modeling and calculate tomographic equations, solve the tomographic equations to obtain the model update amount of this iteration; finally update the model and enter the next iteration until the predetermined convergence requireme...

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Abstract

The invention provides a full-automatic three-dimensional tomography inversion method using a local event slope and belongs to the seismic imaging and inversion field in oil and gas exploration and development. The method includes the following steps that: (1) an event slope is picked up in an automated manner; (2) an event slope coordinate transformation identical equation is utilized to perform quality monitoring, data points (S, R, PS, PR, t) pick are picked up in a filtering manner; and (3), a regularized three-dimensional tomography equation is established and solved.

Description

technical field [0001] The invention belongs to the field of seismic imaging and inversion in oil and gas exploration and development, and specifically relates to a fully automatic three-dimensional tomographic inversion method using the slope of a local event. The implementation of the technology does not require manual intervention and has high precision. 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. Reflection tomography has the advantages of high efficiency and easy implementation. However, it needs to pick up e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G06F19/00
Inventor 倪瑶蔡杰雄
Owner CHINA PETROLEUM & CHEM CORP
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