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Equal-reflection-angle-interval seismic acquisition and observation method and system

An angular interval and seismic wave technology, applied in the field of petroleum seismic exploration, can solve the problems of low sampling density and inability to improve the quality of seismic records, and achieve the effect of strengthening pertinence, improving success rate and improving quality

Active Publication Date: 2019-12-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The equal interval sampling method can be applied to most seismic geological conditions, and has the advantage of being easy to operate in the field, but it is not always the optimal sampling method under all conditions, especially when the sampling density of surface receiver points is low, it cannot be obtained without increasing the sampling density. Effectively improve the quality of seismic records under the condition of seismic acquisition cost

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the drawings. However, it should be understood that the drawings are only provided for a better understanding of the present invention, and they should not be construed as limiting the present invention.

[0018] The seismic acquisition and observation method with equal reflection angle interval provided by the present invention includes the following steps:

[0019] 1) Given a three-dimensional grid seismic wave velocity model V (x, y, z), determine a target formation in the three-dimensional grid seismic wave velocity model V (x, y, z), and determine the target formation Depth varies with horizontal coordinate function T z (x, y), at different V(x, y, z) and z t In the case of (x, y), due to the different propagation paths of seismic waves, the same reflection angle a t Will get different exit positions x t ,vice versa.

[0020] 2) Select a surface focal point on the surface, and determine the x-coo...

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Abstract

The invention relates to an equal-reflection-angle-interval seismic acquisition and observation method and system. The method is characterized by comprising the following steps: (1) determining a target stratum in a three-dimensional grid-shaped seismic wave speed model; (2) selecting a certain earth surface seismic source point on the earth surface, and determining x-coordinate data and y-coordinate data of an earth surface detection point corresponding to the earth surface seismic source point; (3) calculating the corresponding relation between the seismic wave reflection angle at the targetstratum and the emergent position of the seismic wave propagation ray on the earth surface by adopting a ray tracing method; (4) determining an x-coordinate sequence or a y-coordinate sequence of theearth surface detection point by adopting an equal reflection angle interval method; (5) determining a y-coordinate sequence or an x-coordinate sequence of the earth surface detection point by adopting a conventional seismic acquisition method or an equal reflection angle interval method; and (6) obtaining a coordinate sequence of the surface detection point. The method and the system can be widely applied to the technical field of petroleum seismic exploration.

Description

Technical field [0001] The invention relates to a seismic acquisition and observation method and system with equal reflection angle intervals and belongs to the technical field of petroleum seismic exploration. Background technique [0002] Seismic exploration is one of the main tools for oil and natural gas resource exploration. The main process of seismic exploration includes data acquisition, seismic data processing and data interpretation. Among them, the data collection is the determination of the seismic observation system at the onshore seismic exploration data acquisition site, the deployment of seismic sources and geophones in the field according to the determined plan, and the excitation and reception of seismic waves. First, the seismic observation system is determined indoors. Determine the best placement of the seismic source point and the surface geophone, and then deploy the seismic source and geophone in the field according to the determined plan. The seismic sou...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/303
Inventor 魏伟符力耘孙伟家
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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