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Air gun excitation working method

An air gun and excitation point technology, applied in the field of geophysical exploration, can solve the problem that the energy cannot reach the vibration intensity of seismic data

Inactive Publication Date: 2014-08-20
BGP OF CHINA NAT GASOLINEEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mud gun source system used in the past is to directly insert the mud gun into the muddy geological layer for excitation, and the energy released cannot reach the vibration intensity required by seismic data

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: as figure 1 , figure 2 Shown, a kind of air gun excitation operation method comprises the following steps;

[0017] A number of large-diameter drilling rigs are installed on a high-passage carrier platform suitable for swampy areas. Air compressors and air gun control equipment are installed on the carrier platform, and a drilling tool with a gun-drill integrated structure is designed and manufactured. The geophysical survey is combined with a high-pressure air gun;

[0018] When the carrier platform travels to the set artificial seismic excitation point, the drilling rig will drill the drill bit containing the air gun to the specified depth, and multiple guns will complete the excitation together to generate artificial seismic waves required for geophysical exploration;

[0019] The key point of this method is that the diameter of the wellhead drilled by the drilling rig is larger than the outer diameter of the air gun nozzle, so that there is a blasti...

Embodiment 2

[0021] Embodiment 2: as figure 1 , figure 2 Shown, a kind of air gun excitation operation method comprises the following steps;

[0022] A number of large-diameter drilling rigs are installed on a high-passage carrier platform suitable for swampy areas. The drilling rig combines the drill bits with high-pressure air guns for geophysical exploration. When the carrier platform arrives, the drilling rig will drill the drill bit containing the air gun to the specified depth, and the multiple guns will be excited together to generate artificial seismic waves required for geophysical prospecting.

[0023] Using this method, a two-dimensional section of seismic data was picked up in a certain place in Tianjin. This area has typical seismic geological conditions in North China, with thick Quaternary deposits and severe seismic wave absorption and attenuation. Through the acquisition, interpretation and processing of seismic data, the results prove that this method can effectively ...

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Abstract

The invention discloses an air gun excitation working method and belongs to the technical field of bog and beach-sea transition zone geophysical exploration. A plurality of large-aperture drilling machines are arranged on a carrying platform, an air compressor and air gun control equipment are arranged on the carrying platform. A drilling tool of a gun-drill integrated structure is manufactured. A drilling machine drill bit and high-pressure air guns for geophysical exploration are combined. When the carrying platform runs to a set artificial earthquake excitation point, the drill bit comprising the air guns is drilled to a stated depth through a drilling machine, excitation is completed through multiple guns, and artificial earthquake waves needed by geophysical exploration are generated. The diameter of a well opening formed by drilling of the drilling machine is larger than the outer diameter of an air gun nozzle, so that a detonating space is achieved during air gun excitation, high-pressure air can be well released, enough sinking depth of the air gun is guaranteed through a well hole with a certain depth, meanwhile, multi-gun excitation energy superimposed effect is achieved, and accordingly enough quake strength can be effectively obtained.

Description

technical field [0001] The invention relates to an air gun excitation operation method, which belongs to the technical field of geophysical exploration in swamp and beach-sea transition zone areas. Background technique [0002] In marine seismic exploration, air guns are generally used as excitation sources. The working principle of air guns is to use the vibrations generated by the controlled release of high-pressure air in water as artificial seismic waves required for seismic exploration. In the swamp and transition zone areas, many countries have designated the area as a nature reserve, prohibiting the use of explosives, and can only use air guns as the excitation source. The water depth in this area is shallow or there is no water. When the air gun is excited, it is impossible to obtain seismic waves with acceptable vibration intensity. In this case, the environment required for the air gun to excite and release seismic waves can only be met by increasing the depth of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/133
Inventor 李海军李亚夫陈浩林刘军胡宝京高斌戴丽丽史颖
Owner BGP OF CHINA NAT GASOLINEEUM CORP