Controlled earthquake source partitioning type simultaneous scanning motivating 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, increasing the excitation efficiency, and improving the shooting efficiency

Active Publication Date: 2015-02-25
BC P INC CHINA NAT PETROLEUM CORP +1
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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 earthquake source partitioning type simultaneous scanning motivating method
  • Controlled earthquake source partitioning type simultaneous scanning motivating method
  • Controlled earthquake source partitioning type simultaneous scanning motivating 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, each shot point in area A can scan simultaneously with the shot point in area B, such as figure 2 As shown, the minimum distance between the pattern-filled areas of A1 and B is l; when LA=(L-l) / 2, when the two shot points located in A and B that meet the simu...

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Abstract

The invention provides a controlled earthquake source partitioning type simultaneous scanning motivating method. The controlled earthquake source partitioning type simultaneous scanning motivating method comprises the steps that a work area is divided into an area A and an area B, the shot points with the distance between every two adjacent shot points larger than the minimum simultaneous motivating distance are the shot points meeting the scanning motivating conditions, the shot points meeting the scanning motivating conditions are located in an area A1 and an area A2 respectively and are not motivated, motivating is conducted in other areas; sliding scanning or alternate scanning is conducted on shot points, in the area B, in a signal queue, when multiple shot points are located in the area B, the distance between each shot point and the center of the work area is calculated, and the sliding scanning or the alternate scanning is conducted preferably on the shot points with the distances between the shot points and the center of the work area being small. According to the controlled earthquake source partitioning type simultaneous scanning motivating method, the probability of the shot points, located in the middle of the work area, meeting the simultaneous motivating conditions is smaller than that of the shot points located on the edge of the work area. When shot point motivating is conducted, the ratio of simultaneous motivating is higher, the efficiency is higher; in this way, the ratio of the simultaneously motivated shot points is increased, and then the motivating efficiency is improved.

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
Inventor 梁晓峰汪长辉邓志文尚永生侯成福
Owner BC P INC CHINA NAT PETROLEUM CORP
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