Method for determining anisotropic parameters by utilizing data of three-dimensional VSP (Vertical Seismic Profile)

A technology of vertical seismic section and anisotropy, which is applied in the field of vertical seismic section exploration, can solve the problems affecting the quality of seismic imaging, the change of motion correction time difference, etc., and achieve the goal of eliminating the influence of seismic anisotropy, improving precision and improving accuracy rate Effect

Inactive Publication Date: 2011-10-12
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

For vertically fractured reservoirs, that is, HTI anisotropic media, seismic waves will cause different ray bending phenomena when propagating in different directions (such as figure 2 As shown in (b), resulting in the change of motion correction time difference with the azimuth angle, and then affecting the quality of seismic imaging

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  • Method for determining anisotropic parameters by utilizing data of three-dimensional VSP (Vertical Seismic Profile)
  • Method for determining anisotropic parameters by utilizing data of three-dimensional VSP (Vertical Seismic Profile)
  • Method for determining anisotropic parameters by utilizing data of three-dimensional VSP (Vertical Seismic Profile)

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Embodiment Construction

[0043] For the anisotropic medium of VTI, the ray bending phenomenon (such as figure 1 As shown in (a), the resulting dynamic correction time difference problem with the well source distance (or offset distance) changes (such as figure 1 As shown in (b), the HTI anisotropic medium will cause different ray bending phenomena when seismic waves propagate in different directions (such as figure 2 As shown in (a), the resulting motion correction time difference problem with the change of azimuth angle (such as figure 2 (b) shown). The present invention proposes a processing method for obtaining VTI anisotropic medium parameters and HTI anisotropic medium parameters based on three-dimensional VSP data. Correction of anisotropic media eliminates the problem of seismic wave propagation time difference caused by anisotropic media, improves the accuracy of seismic imaging, and provides an effective new technology for pre-stack inversion of complex lithology reservoirs and prediction...

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Abstract

The invention relates to a method for determining anisotropic parameters by utilizing the data of a three-dimensional VSP (Vertical Seismic Profile). The method comprises the following steps: when collecting the actual journey of the three-dimensional VSP, computing the time difference of each depth point; computing the anisotropic parameters of a VT I medium and the residual time difference after being corrected; determining the anisotropic parameters of an HT I medium according to the relation fitting between the residual time difference and the azimuth angle; computing the VT I anisotropic parameters of each depth point and the anisotropic parameters of the HT I medium point by point; obtaining the parameter curve of the relation that the anisotropic parameters are changed along with the depth; and eliminating the influence of the dynamic correction time difference which is changed along with the wellhead distance or the shot-geophone distance. In the method provided by the invention, the problem that the VT I anisotropic medium and the HT I anisotropic medium have the mutual interference is solved; the anisotropic influence of earthquake can be effectively eliminated; and the imaging quality of the earthquake and the prediction accuracy rate of oil gas are enhanced.

Description

technical field [0001] The invention relates to a vertical seismic profile (VSP) exploration technology in petroleum geophysical exploration, in particular to a method for determining anisotropy parameters by using three-dimensional vertical seismic profile data. technical background [0002] Seismic exploration is a general term for the method of using artificially excited seismic waves to survey the crustal structure and stratum lithology related to underground oil, natural gas and coal fields. Conventional seismic exploration is a technology that uses surface seismic sources and receivers for seismic surveys. Vertical seismic profiling (VSP) exploration technology uses surface seismic sources to excite, and uses a single downhole receiver or multiple downhole receiver arrays to record seismic signals at different depths in the downhole. , a seismic survey technique for imaging the subsurface near a wellbore and analyzing reservoir parameters. [0003] In 1931, Burton pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 凌云孙祥娥高军孙德胜林吉祥郭向宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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