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A Method of Suppressing Vibroseis Harmonic Interference

A technology of harmonic interference and seismic source, which is applied in the field of suppressing harmonic interference of vibrator, and can solve problems such as low acquisition efficiency and increased scanning time

Inactive Publication Date: 2017-02-08
BGP OF CHINA NAT GASOLINEEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variable phase scanning and frequency division scanning are only suitable for multiple (≥ 2 times) scanning of a single shot, and long scanning can be used for single scanning, but the scanning time is greatly increased and the acquisition efficiency is low

Method used

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  • A Method of Suppressing Vibroseis Harmonic Interference
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  • A Method of Suppressing Vibroseis Harmonic Interference

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Embodiment Construction

[0036] Aiming at the harmonic interference existing in the relevant seismic records collected by vibrators, the present invention proposes a design method for segmental scanning to suppress harmonics, which can use a single narrow-band segmental scanning method to convert n times, 1 / The n-th harmonic is delayed beyond the target layer, so that the suppression of the harmonics on the collected data achieves the expected effect, and the total scanning time does not increase significantly (equal to or slightly increased by conventional linearity), the cost performance of the final result quality and acquisition efficiency improve.

[0037] The present invention suppresses harmonic interference from the aspect of improving the vibroseis scanning signal design, and the specific implementation steps of the present invention are described below in conjunction with actual seismic data:

[0038] ① Understand the geological tasks of the work area and determine the time of the deepest t...

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Abstract

The invention discloses a method for suppressing harmonic wave interference excited and acquired through a land controllable epicenter, and specifically relates to a method for suppressing controllable epicenter harmonic wave interference. In the method, signal scanning is segmented to narrow band sub scanning, an intermediate-low band sub scanning is arranged to be one octave, a time constant zero value segment is arranged between each sub scanning of segmented scanning, the length of the zero value segment is not smaller than layer reflection time of a deepest destination, and for the segmented scanning determined by a sub scanning number, the parameter of each segment of sub scanning and the length of the zero value segment, controllable epicenter field scanning construction is adjusted so as to suppress the harmonic wave interference. By using the method, the problem of low efficiency caused by multiline long-time scanning and suppressing of the harmonic wave interference is avoided, the purpose of suppressing harmonic waves in single-time scanning with not much increase of time and length is realized, and the purpose of acquiring high-quality earthquake data through a controllable epicenter is better achieved.

Description

technical field [0001] The invention relates to a petroleum seismic exploration data acquisition technology, in particular to a method for suppressing the harmonic interference of a vibroseis in the original seismic records collected by a vibrator on land. Background technique [0002] The first step in oil seismic exploration data acquisition is to excite seismic waves. There are some basic requirements for the excitation of seismic waves. However, in order to adapt to various surface conditions and the characteristics of specific working methods, the used seismic sources and excitation methods are varied. The energy for exciting seismic waves must be strong enough, because in oil exploration, seismic reflection is used to find out the structural form of a set of formations in the depth range of several kilometers underground. Seismic waves start from the source, travel underground and then reflect back to the ground. To travel such a long distance, there is not enough en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 涂伟陈振声夏建军闫杰
Owner BGP OF CHINA NAT GASOLINEEUM CORP