APPROACHES TO THE DEVELOPMENT OF LOW-PERMEABLE CARBONATE DEPOSITS OF THE OSINSKY SUBHORIZON OF THE SREDNEBOTUOBINSKY FIELD
UDC: 552.54+662.276.63+622.276.66
DOI: 10.33285/2413-5011-2021-11(359)-28-34
Authors:
ZYUZEV EVGENIY SERGEEVICH1,
MAKSIMOVA ELIZAVETA NIKOLAEVNA1,
CHERTINA KSENIYA NIKOLAEVNA1,
LEUSHIN NIKOLAY VALENTINOVICH1,
TORGASHOVA LARISA VITALIEVNA1,
KROKHALEVA OLGA ALEKSANDROVNA2
1 LLC "Tyumen Petroleum Research Center", Tyumen, Russian Federation
2 LLC "Taas-Yuryakh Neftegazodobycha", Irkutsk, Russian Federation
Keywords: Patch reefs, cambrian, Osinsky subhorizon, reef facies, low-permeable reservoir, Siberian platform, carbonate rocks
Annotation:
The Srednebotuobinsky field is located in the Botuobinsky district on the north-eastern slope of the Nepsko-Botuobinskaya anteclise. The first oil and gas deposit was discovered in 1970. In 2017, JSC "Rosneft" adopted a roadmap aimed at the industrial development of the hard-to-recover reserves of the Osinsky subhorizon, which is confined to the Bilir formation of the Lower Cambrian age. The reservoir has a complex structure, a patchwork distribution and low permeability. In the 80s of the twentieth century, repeated unsuccessful attempts were made to obtain industrial inflows of hydrocarbons using various methods of intensification, including thermobaric exposure. The first stage included hydraulic fracturing of a formation (HFF) in directional wells. The next steps involve zoning of reservoir types by areas and drilling of horizontal wells using large-volume hydrochloric acid treatment and multi-stage hydraulic fracturing. Further replication was complicated by a lack of understanding of the areal development of zones with better properties.
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