Seismic interval velocity calculation method and device
A calculation method and layer velocity technology are applied in the field of seismic layer velocity calculation methods and devices, and can solve the problems of inability to adapt to underground formation velocity inversion and low accuracy.
Pending Publication Date: 2020-08-07
PETROCHINA CO LTD
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[0002] At present, the DIX formula (Dix formula) is often used in seismic exploration to calculate the layer velocity. The DIX formula is a formula that uses the root mean square velocity to solve the layer velocity, because the layer velocity can reflect and obtain a lot of information about a certain formation. This method The calculation is simple and fast. However, the DIX formula is used to calculate the layer velocity, which is based on the fact that the underground stratum is a horizontal layered uniform medium. When the layer is above and the low-velocity layer is below (for example, the velocity of the volcanic rock-covered area is higher than that of the underlying formation), there are also high-speed layers on the side of the low-velocity layer, and the lateral velocity changes drastically (for example, the velocity of the salt body piercing area is higher than that of the surrounding rock strata. High), so the layer velocity calculated by the DIX formula is not accurate
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[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0023] figure 1 It is a flow chart of the seismic layer velocity calculation method in the embodiment of the present invention, such as figure 1 As shown, the method includes:
[0024] Step 101, establishing a layer velocity model according to the stacked velocity spectrum of the seismic processing work area;
[0025] Step 102, performing forward modeling on the layer velocity model to obtain a stacked velocity spectrum of the forward modeling;
[0026] Step 103, if the difference between the stacking velocity in the stacking velocity spectrum and the stacking velo...
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The invention provides a seismic interval velocity calculation method and device. The method comprises the steps of building an interval velocity model according to the superimposed velocity spectrumof a seismic processing work area, carrying out forward modeling on the interval velocity model to obtain a superimposed velocity spectrum of the forward modeling, if the difference value between thesuperimposed velocity in the superimposed velocity spectrum and the superimposed velocity in the superimposed velocity spectrum of forward modeling is not within the preset range, updating the superimposed velocity spectrum of the seismic processing work area into the superimposed velocity spectrum of forward modeling, executing the above steps again until the difference between the superimposed velocity in the superimposed velocity spectrum and the superimposed velocity in the superimposed velocity spectrum of forward modeling is within a preset range, and outputting the interval velocity model. The seismic interval velocity can be calculated, and the accuracy is high.
Description
technical field [0001] The invention relates to the field of seismic exploration, in particular to a method and device for calculating seismic layer velocity. Background technique [0002] At present, the DIX formula (Dix formula) is often used in seismic exploration to calculate the layer velocity. The DIX formula is a formula that uses the root mean square velocity to solve the layer velocity, because the layer velocity can reflect and obtain a lot of information about a certain formation. This method The calculation is simple and fast. However, the DIX formula is used to calculate the layer velocity, which is based on the fact that the underground stratum is a horizontal layered uniform medium. When the layer is above and the low-velocity layer is below (for example, the velocity of the volcanic rock-covered area is higher than that of the underlying formation), there are also high-velocity layers on the side of the low-velocity layer, and the lateral velocity changes sha...
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IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/303G01V1/362G01V2210/6222G01V2210/52
Inventor 杜磊郭平刘宝鸿柳世光冉波宫振超李理殷敬红韩敏
Owner PETROCHINA CO LTD