Thin layer sedimentary microfacies inversion method and apparatus

Abstract

The invention provides a thin layer sedimentary microfacies inversion method and apparatus. The method comprises the following steps: selecting multiple wells in a work area, and determining the stratum thickness, the response frequency, the response amplitude and the sedimentary microfacies type of the target stratum of each well among the multiple wells; establishing relations between sedimentary microfacies and the stratum thicknesses, relations between the stratum thicknesses and the response frequencies, relations between the stratum thicknesses and the response amplitude, relations between the sedimentary microfacies and the response frequencies and relations between the sedimentary microfacies and the response amplitude, and according to the determined relations, selecting three fusion frequencies and their respective sedimentary microfacies; and according to the sedimentary microfacies and fusion amplitude scopes which are respectively corresponding to the three fusion frequencies, performing RGB fusion on the three fusion frequencies to obtain a thin layer sedimentary microfacies inversion result. The thin layer sedimentary microfacies inversion method and apparatus provided by the invention solves the technical problem of inaccurate sedimentary microfacies obtained through prediction due to incapability of effectively determining three frequencies of fusion attributes in an RGB fusion technology in the prior art.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a thin-layer deposition microphase inversion method and device. Background technique [0002] The purpose of seismic data inversion is to widen the frequency range of seismic data lacking low frequency and high frequency by using the low-frequency and high-frequency information on the well, thereby improving the ability of seismic data to distinguish geological information. [0003] Since the birth of 3D seismic prospecting technology, seismic attributes have played an important role in the study of predicting sedimentary facies. With the deepening of research on lithologic reservoirs, the research on thin layers has become the focus of attention. In 1999, Partyka et al. used spectral decomposition technology to compare the frequency-division slices of the lower frequency band and the higher frequency band, and concluded that the wider channels with thicker sand bo...

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Problems solved by technology

[0004] For RGB fusion technology, it is necessary to effectively determine the three frequencies in the fusion attribute. If these three frequencies are selected more accurately, the prediction of sedimentary microfacies will be more reasonable. No effective solution has been proposed so far.

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