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Ground receiving-based Q-value field modeling method of reflection seismic data

A technology for seismic data and ground reception, used in seismology, seismic signal processing, geophysical measurement, etc.

Active Publication Date: 2017-02-22
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the difficult problem of modeling non-uniform Q-value field in seismic exploration

Method used

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  • Ground receiving-based Q-value field modeling method of reflection seismic data
  • Ground receiving-based Q-value field modeling method of reflection seismic data
  • Ground receiving-based Q-value field modeling method of reflection seismic data

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Embodiment 1

[0132] Embodiment 1: A Q-value field modeling method based on ground-received reflection seismic data, taking the eastern onshore oilfield as an example, the specific steps are as follows:

[0133](1) For the reflection seismic data excited by the artificial source recorded by the survey line on the surface, the pre-stack time migration method is used to obtain the migration velocity field in the time-depth domain and a set of time-depth domain offsets with equal intervals and parallel to the survey line direction. Move the imaging section. The specific acquisition parameters are: 14 survey lines record seismic signals at the same time, the distance between the survey lines is 100m, each survey line has 168 geophone groups, and the distance between the geophone groups is 50m; The spacing between the shot lines is 50m, and the line spacing between the shot lines is 50m. A total of 6500 shots are collected, the recording length is 2.5s, and the time sampling is 1ms.

[0134] (2...

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Abstract

The invention discloses a ground receiving-based Q-value field modeling method of reflection seismic data, and the method is used for improving the resolution of seismic imaging in seismic exploration. According to the method disclosed by the invention, the Q value for describing the absorption attenuation of a seismic wave propagated through the earth medium is obtained by use of the ground-acquired reflection seismic data, and the problem of difficulty in modeling a non-uniform Q-value field in seismic exploration is solved. With the obtained three-dimensional Q-value field, the amplitude attenuation of a high-frequency seismic wave caused by the earth medium viscosity and thin-layer scattering in the migration imaging of seismic data can be compensated, the attenuated high-frequency component is recovered, and a subsurface structure image with resolution higher than that of a subsurface image obtained by a conventional migration method is obtained. The method has important application value in the exploration of oil-gas and mineral resources.

Description

technical field [0001] The invention belongs to the technical field of reflection seismic data processing in seismic exploration, relates to the category of high-resolution migration imaging technology in the process of seismic data processing, and is a three-dimensional non-magnetic image of underground space covered by seismic data by using reflection seismic data received on the ground. A method for uniform Q-value field. Background technique [0002] There is viscous absorption in the actual earth medium, and the small-scale inhomogeneity of the earth medium also produces an amplitude attenuation effect similar to viscous absorption. These objective existences lead to the absorption and attenuation of the amplitude during the propagation of seismic waves; the attenuation is different for different frequency components of seismic waves, and the higher the frequency, the stronger the attenuation. Consequently, seismic signals recorded at the surface and reflected from dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/302G01V1/345G01V2210/6161G01V2210/74
Inventor 张剑锋刘伟王进刘礼农
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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