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Tomography method for travel times of three preliminary waves of offshore cross-well TTI medium

A technology of travel time tomography and imaging method, which is applied in the fields of seismology and seismic signal processing for well logging records, and can solve problems such as forward and inversion problems that are not applicable to strong anisotropic media, ignoring lateral changes in media, etc. Achieve fast speed and high calculation accuracy

Active Publication Date: 2015-02-18
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, such an assumption ignores the lateral variation of the medium, that is, it is not suitable for forward and inversion problems in strongly anisotropic media
Among them, in the strongly anisotropic medium (which can be defined by Thomsen parameters), that is, the wave velocity of seismic waves (qP, qSV and qSH waves) strongly depends on the propagation direction of rays. then apply

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  • Tomography method for travel times of three preliminary waves of offshore cross-well TTI medium
  • Tomography method for travel times of three preliminary waves of offshore cross-well TTI medium
  • Tomography method for travel times of three preliminary waves of offshore cross-well TTI medium

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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] There are only P wave and S wave in the seismically isotropic medium. P wave means that the particle moves along the direction of wave propagation, and S wave means that the particle moves perpendicular to the direction of wave propagation. There are three kinds of waves, qP wave, qSV wave and qSH wave, in the seismically anisotropic medium. Two-dimensional TTI media (tilted transverse isotropic media) can be represented by five elastic parameters and a tilted symmetry axis angle.

[0020] Such as figure 1 As shown, three kinds of first-arrival traveltime tomography methods of the offshore TTI medium of the present invention comprise the following steps:

[0021] 1) Establish a TTI medium vertical well model containing faults, and obtain the elastic parameters of the vertical well model;

[0022] Such as figure 2 As shown, the specific par...

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Abstract

The invention relates to a tomography method for travel times of three preliminary waves of offshore cross-well TTI medium. The method comprises the following steps: (1) establishing a TTI medium straight-well model containing faults and acquiring an elastic parameter of the straight-well model; (2) dividing the straight-well model into a plurality of independent calculation regions; (3) carrying out model parametrization on divided straight-well model areas one by one; (4) implementing discretization on interfaces of the divided straight-well model one by one; (5) acquiring actual observation travel times of preliminary waves qP, qSV and qSH; (6) setting an initial model for inversion, and calculating theoretical travel times of the preliminary waves qP, qSV and qSH as well as corresponding ray paths by virtue of zoning multi-step improved shortest path algorithm; (7) calculating corresponding Jacobian derivative matrix elements; and (8) solving a constrained damped least square question by virtue of a conjugate gradient method for nonlinear inversion, and judging a result: when meeting minimum travel time residual, ending the inversion; otherwise, updating the model for inversion, and turning to step (6).

Description

technical field [0001] The invention relates to a seismic travel time tomographic imaging method, in particular to a travel time tomographic imaging method of three first-arrival waves in an offshore interwell TTI medium. Background technique [0002] With the development of science, technological progress and the improvement of exploration precision, the research on seismic anisotropy has been deepened, and the research on seismic anisotropy has become an important part of theoretical seismology, exploration seismology, geodynamics and earthquake disaster monitoring. hotspots. With the advancement of seismic observation technology, the accumulation of data and the development of computing technology, it is possible to invert anisotropic elastic parameters using seismic wave travel time data. Among them, seismic tomography is one of the main geophysical methods to study the internal structure of the earth. Using seismic travel time tomography to simultaneously study the he...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/28
Inventor 范廷恩白超英胡光义马淑芳王宗俊田楠张显文樊鹏军孙渊宋来明
Owner CHINA NAT OFFSHORE OIL CORP
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