Reflected wave generalized radon spectrum method diffracted wave field separation technology
A technology of reflected waves and diffracted waves, applied in the field of oil and gas field exploration, can solve problems such as precision and accuracy constraints
Inactive Publication Date: 2013-01-02
CHINA UNIV OF PETROLEUM (BEIJING)
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The traditional diffraction wavefield separation only separates the "beaded" reflections on the post-stack section, and the accuracy and accuracy are greatly restricted
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[0033] Illustrated by a synthetic dip-domain common-reflection point gather:
[0034] figure 1 (a) is a synthetic dip gather, figure 1 (b) is the reflected wave generalized Radon spectrum of the dip gather. According to step 1, the generalized Radon transform of the reflected wave is superimposed along the reflection curves of different depths and different inclination angles. Several curves with different real and virtual curves on the gather are several representative superposition paths. The data superimposed along these paths are in The reflected wave is expressed as a point in the generalized Radon spectrum, and the point represented by a cross on the spectrum corresponds to the path of the corresponding color. When the superposition path coincides with the reflection event, the superposition energy is the strongest, so the reflection event will converge into an energy group on the generalized Radon spectrum of the reflection wave, and the position of the energy group i...
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The invention discloses a reflected wave generalized radon spectrum method diffracted wave field separation technology. Underground information is inferred through response of earthquake waves to underground medium in seismic exploration, and when a medium mutation exists underground, diffracted waves are frequently responded. In Tarim carbonate rock region, main oil gas reserving space is secondary corrosion cavities and cracks, and diffraction is dominant in earthquake response of the cavities and the cracks. Accordingly, the diffracted waves are necessarily studied, and characteristics of the diffracted waves are similar to those of reflected waves, so that the diffracted waves and the reflected waves are difficult to distinguish. Accordingly, a method of migration imaging through an inclination angle domain is provided, and the separation of the diffracted wave field is achieved in the inclination angle domain. By means of the thought, on the basis of different responses of the diffracted waves and the reflected waves in the inclination angle domain, a novel inclination angle domain diffracted wave field separation method, namely a reflected wave generalized radon spectrum diffracted wave field separation method, is provided, the diffracted waves and the reflected waves are successfully and intensively separated in an inclination angle channel, and the separated diffracted wave field is independently subjected to imaging. According to application on actual data, the effectiveness and practicability of the method are verified.
Description
technical field [0001] The invention relates to the technical field of oil and gas field exploration, belongs to the category of seismic data processing, and specifically relates to the technology for realizing the separation of diffracted waves and reflected waves in the dip domain. Background technique [0002] For complex media, such as the Tarim Basin, oil and gas are stored in the ancient Cambrian and Ordovician carbonate formations. The buried depth of these formations is below 5,000 meters, and the primary pores have been compacted and filled. Today The reservoir space is the secondary pores formed by dissolution, fracture and other effects. The distribution of these pores is not controlled by sedimentary facies, and the scale of distribution is extremely uneven. Therefore, the only way to find these cave-fracture reservoirs is through seismic means. [0003] The size of the dissolved pores is often much smaller than the wavelength of the seismic wave, which can be ...
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IPC IPC(8): G01V1/28
Inventor 孙赞东白英哲
Owner CHINA UNIV OF PETROLEUM (BEIJING)