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Optimum coupling and matching method for receiving seismic data by special rectifier

A coupling detection and optimal coupling technology, applied in the direction of seismic signal receivers, etc., can solve the problems of limited function of geophones, lack of versatility, increased cost, etc., and achieve the effect of improving resolution

Inactive Publication Date: 2005-08-10
ZHEJIANG UNIV
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Problems solved by technology

[0003] If a special coupled geophone suitable for the surface geological conditions of the work area is really produced, the role of the geophone will be limited and the cost will rise sharply
Because the geophone cannot only be used to receive seismic signals in a specific area, it is not universal, and mass production will cause waste

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  • Optimum coupling and matching method for receiving seismic data by special rectifier
  • Optimum coupling and matching method for receiving seismic data by special rectifier
  • Optimum coupling and matching method for receiving seismic data by special rectifier

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Embodiment Construction

[0016] Optimal Special Coupling Rationale:

[0017] In conventional seismic data acquisition, the tail cones used for coupling are all made of iron materials, with a length of about 5-7cm or 12cm. The diameter of the upper part of the tail cone is about 2cm, and the surface is smooth. When in use, it must be inserted vertically (along the Z direction) into the surface soil to receive the reflected P wave, which constitutes the conventional coupling method of the geophone-surface coupling system as follows: figure 1 (a).

[0018] figure 1 (b) is a schematic diagram of the special coupling model. m D is the total mass of a combination of single or multiple detector cores; M C is the mass of the coupling fully or partially buried in the topsoil. Generally, M C > M D . This device is a rigid mass body with different concrete proportions, when calculating M C cannot be ignored. In addition, it should be ensured that the geophone core is rigidly connected to the device at ...

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Abstract

The present invention discloses a method for implementing optimum coupling and matching with earth surface by utilizing special coupling detector. Said method includes the following steps: in accordance with work area earth surface medium parameter designing a detector base which can be coupled with earth surface instead of detector tail cone, in the same receiving arrangement utilizing the seismic detector with concrete base and conventional detector with ferruginous tail cone which is positioned on adjacent channel to make observation under the identical condition so as to obtain the comparable seismic records, using the record of detector with concrete base which is obtained under the identical condition as desired output of record of conventional detector with ferruginous tail cone, utilizing principle of minimum square filter to solve optimum coupling matching filter factor, then making the seismic records obtained by all the conventional coupling detectors undergo the process of matching filtering treatment so as to obtain optimally-coupled and received signal.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to an optimal coupling and matching method for receiving seismic data by using a special geophone. Background technique [0002] In the past, the geophone was fixed after the manufacturer produced it. It is a universal device, that is, it can be used regardless of the surface geological conditions. In particular, the rigid material of the iron tail cone of the geophone forms a strong wave impedance (the product of density and velocity) interface with the soft ground. According to the reflection and scattering theory of seismic waves, this strong wave impedance interface will attenuate the energy of reflected seismic waves and lose their frequency. [0003] If a special coupled geophone suitable for the surface geological conditions of the work area is really produced, the role of the geophone will be limited and the cost will rise sharply. Because the geophone cannot only be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/18G01V1/20
Inventor 田钢董世学石战结王者江何海元许升晖郭井学
Owner ZHEJIANG UNIV
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