Nonlinear mapping relationship inversion method based on logging phase wave impedance and seismic waveforms

Abstract

The invention belongs to the field of seismic inversion technologies and discloses a method for determining a nonlinear mapping relationship between a wave impedance logging curve and a seismic waveform. According to the method, on the basis of establishing corresponding relationships between different frequency logging data and sedimentary microfacies, frequency division is performed on seismic data through a designed frequency division parameter, seismic frequency division attributes are extracted, and seismic attribute data bodies of different frequency bands are generated; frequency division layer calibration is performed, the wave group characteristics of a wave impedance curve are compared with trace integration profiles of different frequency bands, fine tuning is performed, and stretching and compression processing is performed; and after the frequency division attributes are extracted, a support vector machine is used to establish nonlinear mapping relationships between the seismic frequency division attributes and the logging data. The method of the invention can combine the advantages of the high vertical resolution of logging data and the wide lateral extension of seismic data, improve the resolution of the seismic data, provide a basis for explaining the distribution of sedimentary facies and the development of underground sediments in seismic profiling and providea new inversion technique for approximating a geological real model.

Description

technical field [0001] The invention belongs to the technical field of seismic inversion, in particular to a method for measuring the nonlinear mapping relationship between wave impedance logging curves and seismic waveforms. Background technique [0002] At present, the commonly used existing technology in the industry is: facies-controlled inversion is to reflect the sedimentary facies in the inversion profile through inversion technology. The current seismic inversion technology only converts the seismic section into rock impedance information or other physical parameters, hoping to reflect the difference in sediment lithology (such as distinguishing sand and mudstone) and the distribution mode through these rock physical parameters, but it cannot give The concept of these litho-sedimentary facies, because the same sedimentary facies can develop the same lithology, that is, lithology is not equal to sedimentary facies or microfacies, so the sedimentary facies of the same ...

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Problems solved by technology

[0005] (1) The prior art cannot simultaneously have high vertical resolution of well logging data and wide lateral extension of seismic data

[0006] (2) The distribution of sedimentary facies or microfacies interpreted in the seismic section by well logging and seismic data in the prior art is poor; logging facies can be interpreted in a single well, but its correspondence with seismic attributes and There are multiple solutions to the spread in

[0007] (3) The existing technology cannot provide a reliable basis for explaining the development of underground sedimentary bodies

However, horizon interpretation varies from person to person. Sedimentary models are preconceived and complex stratigraphic contact relationships cannot be established. Therefore, it is easy to obliterate geological phenomena such as updip pinch-out and stratum overlap, which is very unfavorable for the identification of subtle traps or oil and gas reservoirs.

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