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Two-dimensional transverse anisotropy HTI (transversely isotropicmedia with a horizontal symmetry axis) prestack depth migration modeling method and device

A pre-stack depth migration and lateral anisotropy technology, applied in the field of seismic exploration, to improve the imaging effect

Active Publication Date: 2014-04-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0020] The object of the present invention is to: provide a kind of HTI (transverse anisotropy of horizontal symmetry axis) medium seismic data pre-stack migration technology, set up initial velocity model for HTI pre-stack depth migration, carry out the pre-stack of two-dimensional HTI medium Depth migration to solve the imaging problem of seismic data in azimuthal anisotropic media and improve the imaging effect of seismic anisotropic media

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  • Two-dimensional transverse anisotropy HTI (transversely isotropicmedia with a horizontal symmetry axis) prestack depth migration modeling method and device
  • Two-dimensional transverse anisotropy HTI (transversely isotropicmedia with a horizontal symmetry axis) prestack depth migration modeling method and device
  • Two-dimensional transverse anisotropy HTI (transversely isotropicmedia with a horizontal symmetry axis) prestack depth migration modeling method and device

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[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] An embodiment of the present invention provides a two-dimensional HTI prestack depth migration modeling method in a transversely anisotropic medium with a horizontal axis of symmetry. figure 1 It is a flow chart of the method of the embodiment of the present invention, such as figure 1 As shown, the method includes the following steps...

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Abstract

An embodiment of the invention provides a two-dimensional transverse anisotropy HTI (transversely isotropicmedia with a horizontal symmetry axis) prestack depth migration modeling method and a device. The method includes carrying out depth migration of VTI (transversely isotropic media with a vertical symmetry axis) for inputted seismic data, and obtaining two-dimensional anisotropy parameters of different directions of HTI; establishing a quasi-longitudinal-wave qP phase speed formula according to a quasi-longitudinal-wave qP phase speed formula of the VTI and elastic rigid coefficient matrix of the HTI; and calculating three-dimensional anisotropy parameters of the HTI to establish a three-dimensional speed model of the HTI according to the two-dimensional anisotropy parameters of the different directions of the HTI and the quasi-longitudinal-wave qP phase speed formula of the HTI. According to the technical scheme provided by the embodiment of the invention, prestack depth migration of the two-dimensional HTI can be carried out, anisotropy parameters of the HIT are determined, the three-dimensional anisotropy parameters of the HTI are calculated to establish the three-dimensional speed model of the HTI, and accordingly an imaging effect of seismic anisotropy media can be improved.

Description

technical field [0001] The present invention relates to the technical field of seismic exploration, in particular to a new pre-stack depth migration technology in the field of petroleum geophysical exploration, which is applied to the migration imaging of HTI medium, and in particular to a two-dimensional transversely anisotropic medium HTI Prestack depth migration modeling method and device. Background technique [0002] For a long time, people have done a lot of research on anisotropy in subsurface media, but until Thomsen (1986) gave the famous VTI (transversely isotropic media with a vertical symmetry axis, transversely isotropic media with a vertical symmetry axis) The medium anisotropy parameters ε and δ were later applied to seismic exploration. Under the condition of weak anisotropy, Thomsen (1986) derived an approximate formula for the expression of qP (quasi-p wave) phase velocity in VTI medium: [0003] V P (θ)≈α 0 (1+δsin 2 θcos 2 θ+ε sin 4 θ), (1) [000...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 李向阳戴恒昌张春涛张峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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