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SEARCH FOR HYDROCARBON ACCUMULATIONS IN POROUS FRACTURED RESERVOIRS USING THE PRONY TECHNOLOGY

S. N. Smolin 1,2, G. M. Mitrofanov 1,2,3

1 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia; 2 Novosibirsk State University, Novosibirsk, Russia, 3 Novosibirsk State Technical University, Novosibirsk, Russia

The search for nonstructural hydrocarbon accumulations is a Herculean task that requires the use of delicate tools. Such tools include the Prony filtration technology. It allows for direct qualitative forecasting of hydrocarbon bearing features based on frequency-dependent analysis of the observed wave field of CDP reflection-time sections and includes four steps. The article shows capabilities of technology and specific examples of its application by correlation of frequency-dependent Prony images of wave fields with deep drilling data. The performed studies were carried out using CDP 2D seismic data and deep drilling data of 32 wells obtained in the territory of the West Siberian Plate, mainly for the Middle Jurassic (Late Bajocian-Bathonian, Malyshev horizon) interval of terrigenous-sedimentary deposits. At times, the underlaying and overlying Middle and Upper Jurassic deposits were captured. The manifestation forms of various oil and stratum water accumulations and their possible prospecting indicators, as well as signs of the absence of reservoirs are given. As an example, the manifestation and possible prospecting indicators of gas accumulation from a neighboring region within the West Siberian Plate are shown.

Keywords: Prony filtration technology, wave field, images of reflection-time sections, oil accumulation, stratum water accumulation, local dynamic anomaly, Yu2–4 Jurassic reservoirs.

DOI 10.20403/2078-0575-2021-1-74-87