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Ghost wave compression method based on wavelet processing

A wavelet and ghost wave technology, applied in the field of ghost wave suppression based on wavelet processing, can solve the problems of high cost, difficult processing technology, difficult suppression, etc., and achieve the effects of cost saving, fast calculation speed, and easy processing

Inactive Publication Date: 2015-04-22
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High cost, difficult processing technology, and difficulty in suppressing source ghost waves are the disadvantages of this type of acquisition technology to suppress ghost waves

Method used

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  • Ghost wave compression method based on wavelet processing
  • Ghost wave compression method based on wavelet processing
  • Ghost wave compression method based on wavelet processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as image 3 As shown, firstly, the reflection coefficient model is simulated, and the result is shown in (a). Without considering the wavelet attenuation, the wavelet with source ghost and cable ghost and the reflection coefficient model are synthesized into seismic records, and the result is shown in (b). The phase phenomenon cannot truly represent the reflection coefficient model, so it is necessary to suppress the ghost wave. Using the present invention to suppress the ghost wave of the synthetic seismic record (b), the result is shown in (d). The result shows that the ghost wave is in phase after suppression The axial phase becomes single, and the reflection coefficient can be clearly expressed.

[0032]The high-frequency signal will gradually attenuate during the underground propagation of seismic waves. Considering the attenuation of wavelets, the wavelets with source ghosts and cable ghosts and the reflection coefficient model are synthesized into seismic r...

Embodiment 2

[0034] The application effect of the present invention in actual seismic data is as follows: Figure 4 with Figure 5 shown.

[0035] Such as Figure 4 As shown, the arrow in (a) points out the reflected wave from the bottom of the sea without ghost wave suppression, and the reflected wave from the bottom of the sea shows the reflection characteristics of three phases of white-black-white, in which the first white phase is a primary reflection wave, and the black phase is The superposition of the source ghost and the cable ghost, the second white phase is the cable ghost. Using the present invention to suppress ghost waves in (a), the result of suppressing only cable ghost waves as shown in (b), and the result of suppressing cable ghost waves and seismic source ghost waves as shown in (c) are obtained. from Figure 4 It can be seen that as the ghost wave is suppressed, the reflected wave on the seabed indicated by the arrow changes from multi-phase to single-phase graduall...

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Abstract

The invention relates to a ghost wave compression method based on wavelet processing. The method comprises the steps that (1) offshore seismic data information are input, wherein the seismic data information comprises three kinds of seismic wavelets and seismic data comprising uncompressed ghost waves, and the three kinds of seismic wavelets comprise the seismic wavelet comprising cable ghost waves and seismic source ghost waves, the seismic wavelet comprising the seismic source ghost waves only and the seismic wavelet comprising no ghost waves; (2) ghost wave compression is carried out on seismic data with uncompressed ghost waves through the seismic wavelets; (3) seismic data which compress the cable ghost waves and the seismic source ghost waves at the same time are output. According to the ghost wave compression method, the wavelet matching algorithm is adopted for compressing the ghost waves, and the ghost waves are compressed starting from seismic data processing instead of collection, so that the processing process is easy to implement, and the cost is saved; the ghost wave compression method can compress the seismic source ghost waves and the cable ghost waves in the offshore seismic data, and can be widely applied in the offshore seismic exploration process.

Description

technical field [0001] The invention relates to the field of marine seismic exploration, in particular to a ghost wave suppression method based on wavelet processing. Background technique [0002] Ghost wave is an ever-existing problem in marine seismic exploration, which has not been fundamentally solved for a long time, seriously restricting the progress of seismic exploration technology. According to the different formation processes of ghost waves, ghost waves are divided into source ghost waves and cable ghost waves. When the air gun source is placed in the seawater at a certain depth to excite, a part of the energy directly propagates upwards to the sea surface, and then reflects downwards to the deep part of the seabed. After meeting the underground interface, it is reflected back and received by the cable detector. This wave is exactly Trailing after the normal primary reflection constitutes interference, called source ghosting. Corresponding to this, after the sei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/37
Inventor 陈宝书李松康汪小将仝中飞张连群陶杰杨小椿薛冬
Owner CHINA NAT OFFSHORE OIL CORP
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