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A supplementary shot method based on Gaussian ray beam target layer energy illumination

A Gaussian ray beam and incident energy technology, applied in the field of geophysical exploration, can solve the problems of low signal-to-noise ratio, inability to restore in weak energy areas, and the difficulty of seismic data to meet the requirements of seismic processing and interpretation, so as to improve data quality and improve The effect of the signal-to-noise ratio

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The signal-to-noise ratio in this part of the weak energy area is low, and the conventional observation system will not do any processing on the energy weak area, so the observed seismic data is difficult to meet the requirements of seismic processing and interpretation
As a result, in the subsequent seismic processing process, the real underground geological structure cannot be restored for the energy weak area

Method used

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  • A supplementary shot method based on Gaussian ray beam target layer energy illumination
  • A supplementary shot method based on Gaussian ray beam target layer energy illumination
  • A supplementary shot method based on Gaussian ray beam target layer energy illumination

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Embodiment Construction

[0060] In the embodiment of the present invention, a three-dimensional geological model based on the exploration area is constructed, and the offset energy distribution of the underground target layer is obtained by using the lighting technology based on the Gaussian beam ray beam. According to the distribution results, it is found that the positions with weak energy in the target layer are properly shot at the corresponding positions on the surface, and the number of supplementary shots is determined quantitatively, so that the positions with weak illumination energy in the target layer can be compensated. The energy and signal-to-noise ratio of the target layer after seismic data processing are improved, and the purpose of improving the quality of seismic acquisition data is finally achieved.

[0061] The lighting technology based on the Gaussian ray beam will be described in detail below.

[0062] like Figure 1a As shown, the Gaussian ray beam can be regarded as an energy tu...

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Abstract

The invention discloses a supplementary shot method based on Gaussian ray beam target layer energy illumination, comprising the following steps: establishing a three-dimensional geological model of an exploration area according to existing geological data, and performing illumination analysis on the geological model based on the shot point Gaussian ray beam to determine The energy of the element migration of the target layer; the statistics of the energy distribution of the element migration of the target layer to delineate the energy weak area in the target layer; according to the illumination reference value of each shot point for the energy weak area, determine the surface supplementary shot area corresponding to the energy weak area in the target layer ; Set up shot points at equal intervals in the original shot point grid of the surface shot point area. The invention can accurately delineate the energy weak area of ​​the target layer, quantitatively determine the number of supplementary shots, thereby compensating the position of weak illumination energy in the target layer, improving the signal-to-noise ratio after seismic data processing, and improving the quality of seismic acquisition data.

Description

technical field [0001] The invention relates to the technical field of geophysical prospecting, in particular to a supplementary shot method based on Gaussian ray beam target layer energy illumination. Background technique [0002] Seismic acquisition is the first link in seismic exploration and the most critical step in determining the quality of the entire seismic data, and the design of the observation system is the key point in the seismic acquisition link. The design of the observation system is mainly to reasonably set the distribution positions of shot points and receiver points, and improve the efficiency and accuracy of field data collection. [0003] The conventional observation system design is mainly based on the theory of horizontal layered media, and the attribute parameters of the observation system are obtained based on the horizontal layered media, without considering the influence of the actual geological structure. Because the target layer in the actual g...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00
Inventor 肖云飞殷厚成
Owner CHINA PETROLEUM & CHEM CORP