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Velocity analysis method for multi-source seismic data processing

A technology for seismic data and velocity analysis, applied in the field of petroleum exploration, which can solve the problems of strong interference gun noise, divergence of energy clusters in the velocity spectrum, and low signal-to-noise ratio of data.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned difficult problems in the prior art, provide a velocity analysis method in the processing of multi-source seismic data, solve the problem that the noise of the interference shot in the multi-source seismic data is very strong, the signal-to-noise ratio of the data is extremely low, and the velocity The Problem of Divergence of Energy Clusters in the Spectrum

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  • Velocity analysis method for multi-source seismic data processing
  • Velocity analysis method for multi-source seismic data processing

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] In multi-source seismic data, due to the existence of strong interference shot noise (cross talk), the energy of the normally generated velocity spectrum is not concentrated, and the velocity cannot be analyzed. That is, when doing velocity spectrum analysis, there are basically no The phenomenon of energy clusters makes velocity spectrum analysis impossible. Therefore, the velocity scanning method for low SNR data in conventional seismic data processing is applied to the processing of multi-source seismic data, and fine velocity scanning is performed at the corresponding survey line positions according to the spatial density of velocity spectrum analysis.

[0030] Due to the strong interference factors of multi-source data, it is impossible to obtain a good velocity spectrum of focused energy, and to interpret it (according to a certain space and time relation...

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Abstract

The invention provides a velocity analysis method for multi-source seismic data processing, and belongs to the field of oil exploration. The speed analysis method comprises the following steps: selecting target lines in a work area according to intervals, and inputting a minimum velocity, a maximum velocity and a velocity increment; conducting constant-velocity scanning on the target lines respectively to obtain a series of corresponding stacked sections; according to the stacked sections, analyzing the imaging conditions of different velocities which are measured at different spatial positions of the target lines and in different periods to obtain the regularity of spatial velocity distribution in the work area; according to the combination of the regularity of the spatial velocity distribution with an energy velocity spectrum, making a velocity interpretation to obtain an initial velocity of multi-source seismic data; carrying out noise separation and velocity iteration based on the initial velocity.

Description

technical field [0001] The invention belongs to the field of oil exploration, and in particular relates to a velocity analysis method in multi-source seismic data processing, which is used for the processing of multi-source synchronous excitation (vibroseis synchronous scanning) seismic data in oil and gas exploration. Background technique [0002] Multi-source synchronous excitation seismic technology is a high-efficiency seismic acquisition technology. It collects multi-shot seismic records at the time of collecting one-shot data with conventional acquisition technology, and its improvement of acquisition efficiency is very obvious. Since multiple seismic sources are excited synchronously in a very short period of time, the mutual interference between the synchronous source signals is inevitable, resulting in a very low signal-to-noise ratio of the data. The conventional method of obtaining velocity by velocity spectrum analysis is here because The signal-to-noise ratio is...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 陈胜红佘德平杨丽
Owner CHINA PETROLEUM & CHEM CORP
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