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Calculation method and system of sensitivity matrix for anisotropic parameter inversion

A sensitivity matrix and anisotropic technology, applied in the field of petroleum geophysical exploration, can solve the problems of lack of accuracy and inversion speed

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In terms of anisotropic parameter inversion, Alkhalifah et al. first proposed the inversion of anisotropic parameters in inclined TI media by using P-wave NMO velocity (Alkhalifah T, Tsvankin I. Velocity analysis in transversely isotropic media. Geophysics, 1995, 60 (5 ):1550~1566), but for the inversion of anisotropic parameters, there is still a lack of effective means to improve the accuracy and inversion speed of the inversion results

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  • Calculation method and system of sensitivity matrix for anisotropic parameter inversion
  • Calculation method and system of sensitivity matrix for anisotropic parameter inversion
  • Calculation method and system of sensitivity matrix for anisotropic parameter inversion

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no. 1 example

[0066] figure 1 is a flow chart of a calculation method for a sensitivity matrix for anisotropy parameter inversion according to the first embodiment of the present invention. Refer below figure 1 Each step of this method will be described in detail.

[0067] Step S110, establishing the functional relationship between the compressional wave reflection coefficient and the compressional wave impedance, shear wave impedance, density and anisotropy parameters based on the actual logging data.

[0068] Specifically, the functional relationship between the longitudinal wave reflection coefficient and the longitudinal wave impedance, shear wave impedance, density and anisotropy parameters is established based on expression (1):

[0069]

[0070] In the formula, Indicates the longitudinal wave reflection coefficient of the jth interface, j indicates the number of interfaces, and the value is j=0...m; Z pj is the longitudinal wave impedance of the jth interface, Z sj is the sh...

no. 2 example

[0124] Figure 6 is a schematic diagram of the structure of the calculation system for the sensitivity matrix of anisotropy parameter inversion according to the second embodiment of the present invention, refer to below Figure 6 To illustrate the composition of each part of this embodiment.

[0125] Specifically in Figure 6 Among them, the first module 61 of this embodiment executes the operation of step S110 of the first embodiment, the second module 62 executes the operation of step S120 of the first embodiment, and the third module 63 executes the operation of step S130 of the first embodiment , the fourth module 64 executes the operation of step S140 of the first embodiment. It will not be expanded in detail here.

[0126] Those skilled in the art should understand that each module or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed on a n...

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Abstract

The invention discloses a calculation method and system of a sensitivity matrix used for inversion of anisotropic parameters. The method includes the following steps: establishing the relationship between the compressional wave reflection coefficient and the compressional wave impedance, shear wave impedance, density and anisotropy based on actual logging data. The functional relationship of heterogeneous parameters; based on the convolution principle, the simulated prestack azimuth angle gather is obtained by using the established functional relationship and the given seismic wavelet; according to the actual prestack azimuth angle gather and the simulated prestack azimuth angle trace Set up the error function; take the partial derivative of the error function to obtain the sensitivity matrix for anisotropy parameter inversion. The obtained sensitivity matrix information can be used in the pre-stack anisotropy parameter inversion work to extract anisotropic parameters from pre-stack seismic data, improve the convergence speed of the algorithm and the accuracy of the inversion results, and provide an important reference for finding fractured reservoirs material.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a calculation method and system for a sensitivity matrix used for inversion of anisotropic parameters. Background technique [0002] Anisotropy refers to the property that a certain property of the medium is not a fixed value, but changes with the direction. Anisotropy in seismic exploration mainly refers to the characteristic that the propagation velocity of seismic wave in the underground medium changes with the change of propagation direction. [0003] At present, with the deepening of exploration and development, the types of oil and gas geophysical exploration have extended from conventional energy, coal, oil and natural gas to unconventional energy, coal bed methane, oil shale and shale gas, and its exploration areas have ranged from inland to Extending to the offshore or even deep sea, the exploration depth gradually develops from the middle layer to the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 白俊雨
Owner CHINA PETROLEUM & CHEM CORP