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

ELECTROMAGNETIC ASSESSMENT OF OPEN POROSITY AT DEPTHS BELOW BOREHOLE

(Spichak V.V. Zakharova O.K. )

Feasibility study of the porosity forecast in depth and in the interwell space from electromagnetic sounding data in the borehole vicinity and electrical well logs is carried out. The porosity data are synthesized from the laboratory study of the samples’ properties for two boreholes drilled in the Bishkek testing site. The porosity forecast in depth is carried out using the 1D inversion of magnetotelluric sounding data in the vicinities of boreholes. Different variants of the forecast in depth are compared. It is shown that taking into account both electromagnetic sounding resistivity and resistivity well logs enables increasing the forecast accuracy several times (the appropriate relative errors are, in average, around 2%).......

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  • 2020  № 2, pp. 45-50
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