Electromagnetic type vibroseis parallel stimulation collecting and mixing record separating method

A technology of separation method and acquisition method, which is applied in the field of electromagnetic vibroseis parallel excitation acquisition and hybrid recording separation, can solve the problems of long source scanning signal time, low production efficiency, etc., and achieve weakening source interference, ensuring integrity and preservation Reality, achieve the effect of mixing and recording separation

Inactive Publication Date: 2014-08-13
JILIN UNIV
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Problems solved by technology

Since the source scans the signal for a long time, and each shot must wait for the previous shot to be excited before starting, the production efficiency is low

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  • Electromagnetic type vibroseis parallel stimulation collecting and mixing record separating method
  • Electromagnetic type vibroseis parallel stimulation collecting and mixing record separating method
  • Electromagnetic type vibroseis parallel stimulation collecting and mixing record separating method

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment for further detailed description:

[0030] Taking the electromagnetic vibroseis parallel excitation hybrid recording simulated by the finite difference method as an example, the electromagnetic controllable parallel excitation acquisition and hybrid recording separation method related to the present invention is described, including the following sequence and steps:

[0031] a. In the working area, design the location of the source point and the observation system according to the conventional single source acquisition method. A total of 64 seismic source points were set up, with the position numbers ranging from 1 to 64, and a total of 178 geophones were laid in full arrangement for reception. The seismograph is set to the pulse source acquisition mode, that is, to record unrelated seismic records;

[0032] B, place 1 electromagnetic vibroseis at No. 1 source point and carry out vertical stacking test, acco...

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Abstract

The invention relates to an electromagnetic type vibroseis parallel stimulation collecting and mixing record separating method. The method comprises the steps that focus points and an observing system are designed according to a common single focus collecting method, and the number n of vertical stacking times is determined through the experiment to serve as the number of focuses of parallel stimulation; n electromagnetic type vibroseises are arranged on the n focus points along a measuring line, the initial phase and stimulation delay encoding is carried out on scanning signals, the n focuses can be stimulated n times nearly at the same time, and n mixing records are obtained; the n focuses are integrally moved to the subsequent n focus points along the measuring line, and parallel stimulation continues to be carried out. Compared with an existing common single focus collecting method, if n focus parallel stimulation is utilized, a same number of focus points are collected, the work finishing time is 1/n of the working finishing time of the common single focus collecting method, and in other words, the production efficiency is improved by n times. Production efficiency is greatly improved, effective signals in the obtained single focus records are clear, and waveforms are consistent. The vibroseis earthquake exploring working efficiency can be improved, and the construction cost of the field earthquake exploring is greatly reduced.

Description

Technical field: [0001] The invention relates to a seismic exploration data acquisition and preprocessing method, in particular to an electromagnetic vibrator parallel excitation acquisition and hybrid record separation method. Background technique: [0002] Due to the advantages of controllable parameters, safety and environmental protection, and signal frequency bandwidth, electromagnetic vibrator has been more and more widely used in high-resolution vibrator seismic exploration. Conventional vibrator seismic exploration adopts the method of stimulating seismic waves point by point with a single source, that is, serial excitation. Since it takes a long time for the seismic source to scan the signal, and the excitation of each shot must wait for the completion of the previous shot before starting, the production efficiency is low. Parallel excitation technology supports simultaneous excitation of multiple seismic sources at different source points, that is, multiple seismi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 姜弢杨志超徐学纯林君陈振振
Owner JILIN UNIV
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