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Reverse time migration spatial amplitude compensation method based on even gun source wave field lighting

A wave field illumination and amplitude compensation technology, which is applied in the fields of exploration and reservoir geophysics, and can solve problems such as affecting the fine description of oil reservoirs and destroying the characteristics of seismic wave dynamics.

Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Generally, the amplitude compensation method based on the wave field illumination of a single shot source is used to perform weak amplitude compensation. This method is relatively easy to implement, and will not increase the amount of calculation and storage, but it will destroy the dynamic characteristics of seismic waves, thus affecting the subsequent Reservoir fine description

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  • Reverse time migration spatial amplitude compensation method based on even gun source wave field lighting
  • Reverse time migration spatial amplitude compensation method based on even gun source wave field lighting
  • Reverse time migration spatial amplitude compensation method based on even gun source wave field lighting

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] 1) Acquire seismic exploration data and process to obtain depth-domain layer velocity model ( figure 1 (a), mainly composed of a set of monocline structures, a thrust fault and three scatter points) and forward modeling shot data ( figure 1 (b), for one of the shot seismic records);

[0030] 2) Perform single-shot wave equation forward modeling in the depth domain using the following formula:

[0031] 1 v 2 ∂ 2 P s ( X , t ) ∂ t 2 - Δ P ...

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Abstract

The invention discloses a reverse time migration spatial amplitude compensation method which keeps seismic wave dynamics characteristics. A depth domain layer velocity model and forward modeling gun set data are adopted, seismic source waves are selected to conduct forward modeling of the single-gun wave equation in a depth domain, single-gun source wave fields of all times are stored, single-gun source wave field lighting is calculated, single-gun recording is used as reverse forward modeling of the initial boundary along a time shaft to obtain a receiving wave field, the uncompensated single-gun reverse time migration imaging and even gun source wave field lighting are calculated, the single-gun reverse time migration imaging formed after the compensation of the even gun source wave field lighting is obtained, and overlaying is carried out on all the single-gun reverse time migration imaging to obtain overlaid reverse time migrating imaging formed after the compensation of the even gun source wave field lighting. The reverse time migration spatial amplitude compensation method is superior to the single-gun source wave field lighting amplitude compensation method in the aspects of structural imaging in-phase axis relative maintaining, background noise compressing, and waveform and along-layer seismic attribute space-variant relative maintaining.

Description

technical field [0001] The invention relates to exploration and oil reservoir geophysics technology, in particular to a reverse time migration spatial amplitude compensation method based on uniform shot source wave field illumination. Background technique [0002] In exploration and reservoir geophysics, seismic migration imaging is the most critical step. The quality of imaging directly affects the subsequent seismic and geological interpretation, thus affecting the identification of oil and gas reservoirs. Seismic migration imaging can be divided into several categories: (1) Kirchhoff integral method migration based on ray theory; (2) F-K migration and finite difference migration based on one-way wave theory; (3) two-way wave theory-based migration reverse time migration. (1) and (2) belong to conventional seismic migration, and have limited imaging capabilities for complex geological structures such as sharp changes in lateral velocity and high and steep dips. The rever...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 杨仁虎凌云王永军张红梅
Owner BC P INC CHINA NAT PETROLEUM CORP
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