Absolute wave impedance inversion method independent of logging data

A technology of wave impedance inversion and logging data, applied in the field of geophysical exploration, can solve problems such as huge amount of calculation, and achieve the effect of good lateral continuity

Active Publication Date: 2017-12-12
XI AN JIAOTONG UNIV
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Problems solved by technology

This type of method can effectively prevent the algorithm from falling into local extremum points, but its inherent defect lies in the huge amount of calculation

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  • Absolute wave impedance inversion method independent of logging data
  • Absolute wave impedance inversion method independent of logging data
  • Absolute wave impedance inversion method independent of logging data

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Embodiment Construction

[0038] The present invention is described in further detail below in conjunction with accompanying drawing:

[0039]Wave impedance parameter is an attribute related to rock properties that can be applied to reservoir characterization and hydrocarbon detection. Wave impedance inversion is an inversion technique to obtain wave impedance parameters of subsurface medium based on seismic reflection data. The invention proposes an absolute wave impedance inversion method independent of logging data. Firstly, starting from the pre-stack shot seismic data, the long-wavelength P-wave velocity model is obtained by using all the information of the seismic data through full waveform inversion; secondly, based on the long-wavelength P-wave velocity model, through deep-time conversion and Gardner empirical formula The low-frequency wave impedance model is obtained; finally, the low-frequency wave impedance model is used to constrain the wave impedance inversion based on the multi-group vari...

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Abstract

The invention discloses an absolute wave impedance inversion method independent of logging data. The method comprises steps of based on prestack shot-gather seismic data, by use of all information of the seismic data, obtaining a long wavelength P-wave speed model by means of full waveform inversion; then, based on the long wavelength P-wave speed model, obtaining a low frequency wave impedance model through deep time conversion and the Gardner empirical formula; and finally, by use of the low frequency wave impedance model, restraining wave impedance inversion based on multiple groups of variation difference evolutionary algorithms to obtain an absolute wave impedance model. According to the invention, based on the seismic data directly, by use of the full waveform inversion and global optimization algorithm, it is achieved that under the premise of being independent of logging data, inversion is performed on transverse strong non-homogeneity absolute wave impedance parameters. The all information of the prestack seismic data is used, so a transverse well continuous low frequency wave impedance model can be well constructed and by using the global optimization algorithm to solve a wave impedance inversion, so the global optimal wave impedance parameters can be obtained through the inversion.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and relates to an inversion method of physical property parameters of an earth model, in particular to an absolute wave impedance inversion method independent of logging data. Background technique [0002] Oil and natural gas are strategic resources related to national economic development and national security. Further promoting the exploration and development of oil and gas resources in my country is a major national strategy. Lithologic reservoirs will be the most important exploration and development targets in my country for a long time to come. Seismic exploration method is the main method of oil and gas exploration, and absolute wave impedance is an important parameter for oil and gas detection. Lithologic reservoirs in my country mostly have thin interbedded structures vertically and strong heterogeneity laterally. How to describe the absolute wave impedance parameters of lithologi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/40
CPCG01V1/282G01V1/40
Inventor 高照奇潘志斌高静怀
Owner XI AN JIAOTONG UNIV
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