Time-domain seismic interval velocity inversion method

A technology of layer velocity and time domain, applied in the field of seismic layer velocity inversion in time domain, can solve problems such as no physical basis, inconformity with the migration-velocity model, and negative velocity field with severe changes

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The Harlan algorithm sets a set of velocity functions and uses the least square method to find the global solution. This method first filters the velocity singularities to avoid excessive changes in the velocity calculation process of the layer velocity. However, this method directly removes the so-called bad speed point,

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  • Time-domain seismic interval velocity inversion method
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  • Time-domain seismic interval velocity inversion method

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, a time-domain seismic layer velocity inversion method includes the following steps:

[0032] Step 1: Obtain the initial instantaneous velocity (known technology)

[0033] The logging velocity or the average instantaneous velocity of the area can be used as the initial instantaneous velocity (in actual seismic processing, prior to the implementation of the method of the present invention, the field work area will do vsp logging, and the vsp logging will contain the initial instantaneous velocity).

[0034] Step 2: Build the speed update equation: (inventive innovation)

[0035] Use the following formula to update the velocity model:

[0036] V n (t)=V n-1 +ΔV*e -kt (1)

[0037] In the first iteration, V 0 Is the initial instantaneous velocity obtained from the first step, and k is the velocity change gradient (k is an unknown number at...

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Abstract

The invention provides a time-domain seismic interval velocity inversion method, and belongs to the field of seismic exploration data processing. The time-domain seismic interval velocity inversion method includes acquiring initial instantaneous velocities by means of seismic logging; establishing relations among the instantaneous velocities and root-mean-square velocities; converting the initial instantaneous velocities into root-mean-square velocities; constraining actually picked root-mean-square velocities to create an objective function; solving the objective function to obtain variables required for updating a velocity model; acquiring a final interval velocity when a value of the objective function is smaller than a threshold value epsilon after repeated iteration. The time-domain seismic interval velocity inversion method has the advantages that the stable velocity can be acquired by the time-domain seismic interval velocity inversion method, the stable and smooth interval velocity model can be provided for migration, the velocity can be used for seismic migration imaging, and data support can be provided for oilfield development and petroleum drilling.

Description

Technical field [0001] The invention belongs to the field of seismic exploration data processing, and specifically relates to a time-domain seismic layer velocity inversion method. Background technique [0002] Dix proposes a formula for estimating layer velocity from root mean square velocity: [0003] V 0 , n = V 2 , n 2 t n - V 2 , n - 1 2 t n - 1 t n - t n - 1 [0004] Where V 0，n Is the layer velocity, V 2，n-1 , V 2，n Is t n-1 Root mean square velocity of the upper and lower interfaces at the moment, t n For the corresponding travel time. According to this formula, even when the root-mean-square velocity changes very little, it is easy to cause negative velocity without physical meaning and large instability of velocity value. The accuracy of layer velocity estimation is critical for both time and depth migration. Therefore, many scholars have devoted themselves to studying the co...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 吴鹏孙开峰
Owner CHINA PETROLEUM & CHEM CORP
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