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Method and system for calculating VTI (Velocity Time Integral) anisotropic parameter by utilizing well seismic calibration

An anisotropic, well-seismic calibration technology, applied in the field of seismic exploration, can solve problems such as differences in geological conditions of anisotropic velocity models, sparse logging layered data, and accuracy limitations.

Active Publication Date: 2015-07-08
PETROCHINA CO LTD
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Problems solved by technology

This method has two limitations: first, the geological interface where the layered data has been obtained must be used as the anisotropic interface. In fact, the geological interface where the layered data is located does not completely correspond to the anisotropic interface, resulting in The anisotropic velocity model is quite different from the actual geological conditions. Second, due to the sparse logging data, this method can only calculate the equivalent δ values ​​of a few large sets of formations, which limits the accuracy. limit

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  • Method and system for calculating VTI (Velocity Time Integral) anisotropic parameter by utilizing well seismic calibration
  • Method and system for calculating VTI (Velocity Time Integral) anisotropic parameter by utilizing well seismic calibration
  • Method and system for calculating VTI (Velocity Time Integral) anisotropic parameter by utilizing well seismic calibration

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[0031] In order to make the object, technical solution and advantages of the present invention clearer, 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.

[0032] figure 1 It is a flowchart of a method for calculating VTI anisotropy parameters using well seismic calibration in an embodiment of the present invention. As shown in the figure, the method for calculating VTI anisotropy parameters by using well seismic calibration in the embodiment of the present invention includes:

[0033] Step S101, pick up the seismic reflection horizon along the anisotropic strong reflection interface on the seismic section; Step S102, according to the seismic reflection horizon, use the velocity analysis method to calculate the layer velocity of each horizon, ...

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Abstract

The invention discloses a method and a system for calculating a VTI (Velocity Time Integral) anisotropic parameter by utilizing well seismic calibration. The method comprises the following steps of: picking seismic reflection horizons along a strong reflection interface having the aeolotropism on a seismic section; calculating the horizon speed of all the horizons by utilizing a velocity analysis method according to the seismic reflection horizons and establishing a velocity-depth model; calculating according to the velocity-depth model to obtain the anisotropic formation thickness; carrying out prestack migration processing on seismic data according to the velocity-depth model to generate prestack migration data; carrying out proportion back to time domain on the prestack migration data and the velocity-depth model by utilizing the horizon speed of all the horizons to generate time domain seismic data; extracting a well bypass in the time domain seismic data, comparing with obtained log data and calculating through well seismic calibration to generate the isotropic formation thickness; and calculating according to the anisotropic formation thickness and the isotropic formation thickness to generate the VTI anisotropic parameter.

Description

technical field [0001] The present invention relates to a method of seismic exploration technology, more specifically, the present invention relates to a method and system for calculating the anisotropy parameter δ of VTI medium by means of well-seismic calibration in seismic data processing. Background technique [0002] The strata have anisotropic properties. If accurate anisotropy correction can be performed during seismic data processing, not only the imaging quality of seismic data can be improved, but also the processing results can reflect the stratum depth more accurately. Anisotropic pre-stack depth migration in VTI media is the mainstream technology for seismic data processing today, and the migration dispersion equation used is: 4 ω 2 k y 2 + k z ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 彭更新王小卫陈猛袁刚段文胜崔永福
Owner PETROCHINA CO LTD
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