Elastic reverse time migration imaging method by combining seismic multi-component

A reverse time migration imaging and multi-component technology, applied in the field of exploration geophysics, can solve the problems of inability to guarantee the accuracy of imaging amplitude and physical meaning, loss, and neglect of multi-component data elastic vector characteristics, etc.

Inactive Publication Date: 2011-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Second, the elastic vector feature of multi-component data is ignored
Using scalar wave processing technology will inevitably lose the above characteristics
Therefore, based on this conventional processing me

Method used

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  • Elastic reverse time migration imaging method by combining seismic multi-component
  • Elastic reverse time migration imaging method by combining seismic multi-component
  • Elastic reverse time migration imaging method by combining seismic multi-component

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Experimental program
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Embodiment 1

[0015] Embodiment 1: The technical solution adopted for the realization of the present invention is to directly use multi-component seismic data as input, and to carry out forward and reverse time extrapolation based on the elastic wave equation under the condition of not performing wave field separation on the input data, and to combine multi-component The elastic vector wave field in the ground is jointly constructed, and the elastic wave cross-correlation imaging condition of illumination compensation is used to obtain four kinds of elastic waves with clear physical meanings (P-wave, S-wave, converted P-wave and converted S-wave, abbreviated as PP, SS, SP and PS waves) ) imaging results, and perform low-pass angle-domain filtering to suppress the low wavenumber noise in elastic reverse time migration, and obtain the final elastic wave migration imaging results. Specific steps are as follows:

[0016] 1. Elastic wave propagation operator and construction of underground vecto...

Embodiment 2

[0046] Embodiment 2: The present invention takes the Marmousi2 model as an example, and describes the content and realization principle of the present invention in conjunction with the accompanying drawings:

[0047] In order to test the correctness of the elastic wave imaging method, the Marmousi2 model is used for test analysis.

[0048] 1. Input multi-component seismic data

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Abstract

The invention discloses an elastic reverse time migration imaging method by combining seismic multi-component and belongs to the field of exploration geophysics. The method comprises the following steps: directly inputting seismic multi-component data; without performing the wave field separation on the input data, extrapolating forwards at inverse time based on an elastic wave equation; building an underground elastic vector seismic wave field by combining with multi-component; acquiring four elastic wave imaging results having specific physical significance, such as longitudinal wave, transverse wave, transition longitudinal wave and transition transverse wave, by applying an elastic wave cross-correlation imaging condition of lighting compensation; and suppressing the low wave number noise in the elastic reverse time migration by performing low-pass angle filtering, thereby acquiring an imaging result of final elastic wave migration. By directly inputting the seismic multi-component data and building the underground elastic vector seismic wave field by combining with multi-component, the method can be used for accurately imaging for complex earth medium.

Description

1. Technical field: [0001] The invention relates to the field of exploration geophysics, in particular to a seismic multi-component joint elastic reverse time migration imaging method. 2. Background technology: [0002] With the in-depth development of seismic exploration, the target of oil and gas exploration is gradually shifting to the direction of complex surface, complex structure and complex reservoir, which puts forward higher requirements for the precision of seismic imaging. At present, in oil and natural gas seismic exploration, the longitudinal wave exploration method is still the main method. However, the wave field propagating in the earth medium is not limited to the longitudinal wave, but also the shear wave and converted wave. That is to say, the seismic wave field is an elastic wave field, so the migration imaging technology based on the elastic wave equation can be better Accurately characterize the Earth medium. Based on this, elastic seismic migration i...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 杜启振朱钇同秦童
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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