Geology, geography and global energy
Scientific and Technical Journal
New methods of the forecast the raponasyshchenny layers for the purpose of prevention of possible complications at well-drilling
2018. №2, pp. 9-17
Khaylovskiy V.N. - Chief Geologist, JSC Oktopus, 10 Governor A. Guzhvin ave., Astrakhan, 414000, Russian Fderation, haylovskiy@mail.ru
Pykhalov V.V. - Deputy Chief Geologist for seismoprospecting Works, D.Sc. in Geological and Mineralogical, JSC Oktopus, 10 Governor A. Guzhvin ave., Astrakhan, 414000, Russian Fderation, pyhalov@octopusgaz.ru
Ushivtseva L.F. - C.Sc. in Geological and Mineralogical, Associate Professor, Astrakhan State University, 1 Shaumyan sq., Astrakhan, 414000, Russian Fderation, ushivceval@mail.ru
The forecast of mining-and-geological conditions of sites of laying of new wells is an integral part of geological monitoring of process of construction, promoting accident-free opening of a geological section and timely prevention of possible complications in the course of drilling. And the nizhnepermskikh of deposits of the Kungur tier within the Astrakhan GKM for the first time since 2012 began to apply passive microseismic methods in modification to a complex research of distribution of zones of not uniformity of a geosreda of a nadsolevy complex the low-frequency seismic sounding (LFSS) and the location of microseismic events (LME), the borehole and land electroinvestigation (BLE). These methods allow to reveal local zones of a razuplotneniye (treshchinovatosti-LMS), natural and technogenic congestions UV, heterogeneity and high-pressure raponasyshchenny layers in salt Kungur thickness, to give the forecast of geological complications for design stages of construction of wells; to carry out monitoring of the complicated wells; to define a background flyuidonasyshchennost of a nadsolevy sedimentary cover, to conduct monitoring of advance of promstok on the ground of burial. Results of works as the NSZ method allow to distinguish anomalies of a deviation of seismic speed from basic seismic high-speed model which then coordinate with data of drilling, a geological section of wells and data of the GTI station. In processing and interpretation of data of NSZ it has been established that anomalies of NSZ with intensity more than 0,3 characterize availability of gas-saturated layers of which excess Ssum/Sfon more than by 10 times is characteristic. The saliferous thickness of Kungur is characterized by considerable heterogeneity of lithologic structure: sulfate-terrigenous, terrigenous, terrigenous and carbonate and sulphatic breeds are more rare. In the presence of flyuidoupor (anhydrites, salt), they are traps for a brine congestion.
Key words: мониторинг разработки месторождений, солянокупольная тектоника, пассивные микросейсмические методы, вертикальное сейсмическое профилирование, скважинно-наземная электроразведка, неоднородности массива, аномалии записи, сейсмические скорости, field develop
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