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Method for propagating pseudo acoustic quasi-P waves in anisotropic media

An anisotropic, medium technology used in the field of geophysical exploration to solve problems such as unstable wave propagation and numerical instability

Inactive Publication Date: 2011-06-22
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to inclination and / or rapid lateral changes in certain rock properties (when the vertical velocity is greater than the horizontal velocity), these state-of-the-art pseudoacoustic modeling and migration methods can become numerically unstable and lead to unstable wave propagation

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  • Method for propagating pseudo acoustic quasi-P waves in anisotropic media
  • Method for propagating pseudo acoustic quasi-P waves in anisotropic media
  • Method for propagating pseudo acoustic quasi-P waves in anisotropic media

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Embodiment Construction

[0064] An embodiment of the invention is illustrated in figure 1 in, among them, process Figure 10 A method for propagating quasi-P waves that remain stable in anisotropic media with variable tilt is described. The invention is not limited to weak anisotropy conditions. This particular embodiment includes acquiring a seismic survey volume 12 of a subsurface region of interest and determining a modeling geometry 14 for the seismic survey volume. This embodiment further includes using the simulated geometry for initial conditions to propagate at least one wavefield through the seismic survey volume, preventing accumulation of energy along the axis of symmetry of the seismic survey volume, and utilizing finite quasi-S-wave velocities to ensure stress - A positive stiffness coefficient in the strain relation, resulting in a stable wavefield 16 . The stable wavefield may then be utilized to generate a subsurface image 18 of the subsurface region of interest.

[0065] Those of ...

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Abstract

A computer-implemented method for pseudo acoustic quasi-P wave propagation which remain stable in anisotropic media with variable tilt and is not limited to weak anisotropic conditions. The method includes acquiring a seismic exploration volume for a subsurface region of interest, and determining a modeling geometry for the seismic exploration volume. The method further includes propagating at least one wavefield through the seismic exploration volume utilizing the modeling geometry and initial conditions and preventing the accumulation of energy along the axis of symmetry of the seismic exploration volume and ensuring positive stiffness coefficients in the stress-strain relations through the use of finite quasi-S wave velocities thereby producing a stable wavefield. The method includes utilizing the stable wavefield to generate subsurface images of the subsurface region of interest.

Description

technical field [0001] The present invention relates generally to geophysical exploration using seismic signals, and more particularly to methods of propagating pseudosonic quasi-P waves in variable-tilt anisotropic media and using the propagated wavefields for subsurface characterization. Background technique [0002] Anisotropy can be observed throughout many hydrocarbon exploration regions (eg, the Gulf of Mexico, the North Sea, and the West African coast) due to the preferential ordering of stress-related minerals and defects. In these regions, rock properties can often be characterized as a transversely isotropic ("TI") medium with the axis of symmetry perpendicular or inclined. Wave propagation in anisotropic media exhibits different kinematics and dynamics than wave propagation in isotropic media, therefore, anisotropic modeling and migration methods are required to properly image reservoirs for hydrocarbon exploration. [0003] However, three-dimensional ("3D") anis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/00
CPCG01V1/30G01V2210/675
Inventor 刘伟K・P・巴布
Owner CHEVROU USA INC