A three-dimensional tti medium ray tracing method and system

Abstract

The invention discloses a three-dimensional TTI medium ray tracing method and system. The method comprises the steps of deriving an eikonal equation under a three-dimensional TTI medium based on an acoustic wave approximate equation; parsing the eikonal equation under the three-dimensional TTI medium into the modes representing the velocity of longitudinal seismic waves propagating along the direction of a symmetry axis of the TTI medium, a Thomsen anisotropy parameter, a TTI medium symmetry axis inclination angle and a TTI medium symmetry axis azimuth angle; building a ray tracing equation under the three-dimensional TTI medium based on the parsed eikonal equation; and acquiring a ray path and ray parameters based on the ray tracing equation, and recording the ray travel time of the ray when the target position is traced while obtaining the ray path. According to the method, accurate travel time can be acquired, the seismic data is processed by using the ray tracing result, and a problem that the seismic data processing method at present is low in accuracy can be effectively solved.

Description

technical field [0001] The invention relates to the field of seismic data processing, in particular to a three-dimensional TTI medium ray tracing method and system. Background technique [0002] In the field of seismic data processing, for a Transverse Isotropic (TI) medium, ideally, if the symmetry axis of the medium is vertical, the transverse isotropic medium is a VTI (Transversely Isotropy With A Vertical Axis of Symmetry) medium , if the symmetry axis of the medium is horizontal, the transversely isotropic medium is HTI (Transversely Isotropy With A Horizontal Axis of Symmetry) medium. However, in actual situations, the symmetry axis of the TI medium is often inclined. At this time, the transversely isotropic medium is called a TTI (Transversely Isotropy With A Tilt Axis of Symmetry) medium. [0003] In the current seismic data processing, the theoretical assumptions and prerequisites based on isotropic media and VTI media are used to simplify the expression of seismic...

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Problems solved by technology

[0003] In the current seismic data processing, the theoretical assumptions and prerequisites based on isotropic media and VTI media are used to simplify the expression of seismic wave propagation in underground media, which leads to wrong structural imaging positions of target layers in seismic migration imaging data processing, and even This results in a phenomenon that does not match the logging data both in depth and in the vertical direction, burying hidden dangers for later calculation of trap scale and well location prediction

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