Controlled seismic source subarea simultaneous scanning excitation method

A simultaneous scanning and partitioning technology, applied in the field of geophysical exploration, can solve problems such as limitations, and achieve the effects of increasing the ratio, improving the shooting efficiency, and improving the excitation efficiency

Inactive Publication Date: 2015-07-01
杨顺伟
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to statistics, the length of most work areas is limited, so the length of the work area limits the application of simultaneous scanning excitation methods

Method used

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  • Controlled seismic source subarea simultaneous scanning excitation method
  • Controlled seismic source subarea simultaneous scanning excitation method
  • Controlled seismic source subarea simultaneous scanning excitation method

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Embodiment Construction

[0029] The present invention adopts following steps to realize:

[0030] 1) Divide the work area into A area and B area, A area is located on both sides of the work area near the border, and B area is located in the middle of the work area, such as figure 1 As shown, the work area is divided into 3 areas;

[0031] The said A area has two blocks, which are divided into A1 area and A2 area in sequence;

[0032] The respective length divisions of the A zone and the B zone are determined according to the following formula:

[0033] (L-l) / 3≤LA≤(L-l) / 2

[0034] In the formula: the length of the working area is L, and the minimum simultaneous excitation distance is l;

[0035] Length LA of zone A:

[0036] When LA=(L-l) / 3, every shot point in A district can scan simultaneously with the shot point in B district, as figure 2 As shown, the minimum distance between the pattern filling areas of A1 area and B area is l; when LA=(L-l) / 2, when the two shot points located in A area and ...

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Abstract

The invention discloses a controlled seismic source subarea simultaneous scanning excitation method. The method comprises following steps: 1) a work zone is divided into A areas and a B area, the A areas are arranged on the two sides, close to the boundry, of the work zone, the B area is arranged at the middle portion of the work zone, and the A areas are composed of two blocks, namely the A1 area and the A2 area arranged sequentially; and 2) the excitation order is adjusted according to shot point subareas; the distance between every two shot points in a Ready signal queen is calculated, and the shot points whose spacing distance is larger than the minimum simultaneous excitation distance meet demands of simultaneous scanning excitation; if the shot points meeting demands of simultaneous scanning excitation are respectively arranged in the A1 area and the A2 area, the A1 and A2 areas are not excited, and the other area is excited; the shot points in the B area and in the Ready signal queen are scanned in a sliding manner or an alternative manner; and when multiple shot points in the Ready signal queen are arranged in the B area, the distance between the shot points and the midpoint of the work zone needs to be calculated, and the siding scanning or alternative scanning is preferentially carried out on the shot point which is arranged the nearest from the midpoint of the work zone.

Description

technical field [0001] The invention belongs to the technical field of geophysical prospecting, and relates to a vibroseis scanning excitation method in subregions and simultaneously in seismic data acquisition. Background technique [0002] When using a vibrator for seismic acquisition, it takes a few seconds to tens of seconds for the vibrator to complete a vibration. A vibration is also a scan, and the time used is called the scan time. According to construction requirements, the excitation of a shot point can be done by The vibration of a single source can be completed at one time, and it can also be completed by combining the vibration of several sources. No matter what parameters are used, it takes a certain amount of time to complete the excitation of a shot point. In order to improve the vibration efficiency and adapt to high-precision, high-density earthquakes With the development of exploration, various high-efficiency excitation methods of vibrators have been prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/02
CPCG01V1/00G01V1/02
Inventor 杨顺伟
Owner 杨顺伟
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