Method for solving discontinuity of reverse time migration waveform
A technology of reverse time migration and reverse time migration imaging, which is applied in the fields of exploration and reservoir geophysics, and can solve problems such as affecting the effect of seismic exploration, discontinuity of reverse time migration waveform, and aggravation of waveform discontinuity
Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +1
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The reverse time migration imaging mechanism is different from conventional seismic migration. Its imaging waveform is discontinuous, and the waveform discontinuity increases with the increase of the spatial grid step size, even if the spatial grid is refined to a small (1m* 1m) can not solve the problem of reverse time migration waveform discontinuity, this problem directly affects the effect of seismic exploration
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[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and implementation examples.
[0024] The present invention is realized through the following steps:
[0025] 1) Acquire seismic data and process to obtain the velocity model in the depth domain ( 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);
[0026] 2) Perform single-shot wave equation forward modeling in the depth domain using the following formula:
[0027] 1 v 2 ∂ 2 P s ( X , t ) ∂ t ...
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The invention relates to a method for effectively solving discontinuity of a reverse time migration waveform, and the method can improve fine description of an oil reservoir. The method includes the steps that by the adoption of a depth domain layer speed model and forward modeling shot gather data, a seismic focus subwave is firstly selected, single shot wave equation forward modeling is performed in a depth domain, and single shot source wave fields of all moments are stored; a single shot seismic record is taken as initial boundary conditions, started from the maximum record moment, wave equation forward modeling is performed along a time shaft to obtain receiving wave fields, single shot reverse time migration images after waveform continuing are obtained by using smooth imaging conditions provided in the method, and all the single shot reverse time migration images are superimposed to obtain a reverse time migration image. In the aspects of waveform continuity, horizon seism instantaneous frequency and phase position space-variant stability, the smooth imaging conditions of the method are better than conventional imaging conditions.
Description
technical field [0001] The invention relates to exploration and oil reservoir geophysics technology, in particular to a method for solving the discontinuity of reverse time migration waveform. technical background [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. Reverse time migration is based on the two-way wave...
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IPC IPC(8): G01V1/28
Inventor 凌云杨仁虎郭向宇胡新会
Owner BC P INC CHINA NAT PETROLEUM CORP