Issues of the journals Геофизика 2020 y. issue 2

UPSCALING LITHOTYPES FOR INTEGRATED INTERPRETATION OF WELL LOGGING AND SEISMIC DATA

(Epov K.A. )

An approach to upscaling petrophysical lithotypes is proposed. This procedure results in a new system of effective rock types which characterize lithological diversity of deposits in the seismic frequency bandwidth. These upscaled lithotypes are corresponded„fectiveto some classes of stochastic ensembles composed of log-scale “elementary is defined based on classification error probability. Parameters of “ef „lithotypes. Similarity measure between any two classespetrophysical properties probability distributions for theupscaled lithotypes can be estimated using stochastic petrophysical modeling technique. The obtained system can be naturally linked to the results of geological interpretation of core and well logging data. Theoretical background of the suggested method is considered in the first part. The second part presents two case studies based on synthetic and real data.......

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  • 2020  № 2, pp. 2-21

MILLION CHANNELS AND BILLION TRACES IN LAND SEISMIC: IS IT ACTUAL OR NOT?

(Cherepovskiy A.V. )

The number of channels in a single land seismic crew is growing each decade by an order, and modern vibroseis mega-crews operate with the number of channels varying from tens to hundreds of thousands. Large number of channels in combination with high-productivity field techniques allow for high-density wide-azimuth seismic surveying with the number of traces per sq. km varying from one-two millions to one hundred millions. The experience of high-density seismic in the Middle East proves that the signal bandwidth could be significantly expanded toward high frequencies, and the seismic attributes could be calculated in a more reliable way.......

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  • 2020  № 2, pp. 22-26

AUTOMATIC EXTRACTION OF FAULT GEOMETRY FROM SEISMIC DATA BY CONVOLUTIONAL NEURAL NETWORKS

(Egorov D.V. )

In the presented research application of convolutional neural networks for fault interpretation from seismic data was considered. Proposed architecture and training process were described. It was shown by metrics and visual analysis that developed method is able to delineate faults from seismic data in different geological and geophysical conditions. Additional advantage of suggested approach is its ability to produce probabilistic output allowing robust work with geological uncertainties and economic risks related to them due to consideration of many probable cases.......

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  • 2020  № 2, pp. 27-31

ESTIMATION OF THE DILUTION OF THE BREEDTHE MASSIF BY ELECTROSONDENTING METHOD

(Golik V.I. Dmitrak Yu.V. Komashchenko V.I. Burdzieva O.G. )

The results of estimating the weakness of the arrays by geophysical methods are given, with a detailed elaboration of the method of electrometric measurements in wells without core sampling. The rocks of the massif are differentiated according to the degree of weakness of the rocks, which makes it possible to optimize production processes with the economic effect of reducing the time and cost of production. An example of determining the distance from the conductivity of rocks is given. The results of the study are of interest for practical use in studying the properties and watering of rocks, the study of linear weathering of the crust, analysis of large and micro fracturing, etc.......

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  • 2020  № 2, pp. 32-36
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