Simultaneous Correction Method for Velocity Anisotropy of P- and S-wave Logging in Highly Deviated Wells
An anisotropic, shear wave velocity technology, applied in the field of oil and gas exploration, can solve the problems of not considering formation layering, inability to correct longitudinal and shear wave velocity, etc.
Inactive Publication Date: 2015-12-02
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
Hornby (2003) proposed a method to correct the P-wave velocity of deviated wells, using the anisotropy parameters of mud, based on the measured P-wave logging velocity to invert the vertical P-wave velocity corresponding to the logging velocity of deviated wells, but he only considered the mud Due to the qualitative anisotropy, the influence of stratigraphic layer is not considered, and only the compressional wave is corrected. Therefore, it is impossible to correct the compressional and shear wave velocities measured in a highly deviated well with a certain dip angle to the vertical and vertical wave velocities of the formation.
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[0022] figure 1 It is a schematic diagram of a highly deviated well.
[0023] figure 2 It is a schematic diagram of the impact of compressional and shear wave velocities on the well deviation angle under the influence of all directions. The anisotropic phase velocity and the velocity data caused by the change of the wellbore angle are close to the theoretical anisotropic phase velocity, but the gap between the isotropic velocity measured in the vertical direction becomes larger; figure 2 The data points in the middle represent the measured velocities corresponding to a certain wellbore inclination angle θ. The data of the P-wave velocity and the corresponding inclination angle come from the article Anisotropycorrectionfordeviated-wellsoniclogs:Applicationtoseismicwelltie published by Hornby et al. in 2003 on pages 464-471 of Vol. The shear wave data is calculated according to the Vp-Vs relational expression of Castagna by the longitudinal wave velocity data of Hornby, and ...
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The invention discloses a method for simultaneously correcting the anisotropy of the longitudinal wave logging speed and the anisotropy of the transverse wave logging speed in a highly-deviated well. The method includes the steps of simultaneously correcting the longitudinal wave speed and the transverse wave speed measured in the deviated well with mud and fracture development in a layered distributed stratum so that the influences of the inherent anisotropy of the mud in the stratum, the anisotropy of fractures in the stratum and the stratum layered anisotropy on the longitudinal wave speed and the transverse wave speed in the deviated well can be eliminated, and correcting the longitudinal wave speed and the transverse wave speed measured in the highly-deviated well with a certain inclination angle to be perpendicular to the longitudinal wave speed and the transverse wave speed in the stratum. By means of the method, the longitudinal wave speed and the transverse wave speed measured in the highly-deviated well with the certain inclination angle can be corrected to be perpendicular to the longitudinal wave speed and the transverse wave speed in the stratum, and the longitudinal wave speed and the transverse wave speed measured in the highly-deviated well with the certain inclination angle can be accurately corrected to be perpendicular to the longitudinal wave speed and the transverse wave speed in the stratum without being influenced by the inherent anisotropy of the mud, the anisotropy of the fractures and the stratum layered anisotropy.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for simultaneously correcting the velocity anisotropy of longitudinal and shear wave logging in highly deviated wells. Background technique [0002] Logging compressional and shear wave velocities are the basic data for seismic reservoir prediction methods such as pre-stack inversion and AVO analysis. The velocity measured in well logging is the velocity along the wellbore direction, while the velocity obtained in seismic is the velocity perpendicular to the formation. When the wellbore is perpendicular to the formation, the two are consistent; when the wellbore has a certain inclination relative to the formation, and the formation is an anisotropic medium, that is, when the velocities in different directions are different, the velocity measured in the well is no longer perpendicular to the formation Therefore, there is a certain difference from the seis...
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IPC IPC(8): G01V1/36G01V1/40
Inventor 孙赞东刘致水田军
Owner CHINA UNIV OF PETROLEUM (BEIJING)