Hard-extracted reserves, unconventional hydrocarbon sources
Article # 33_2024 submitted on 07/11/2024 displayed on website on 11/05/2024
29 p.
pdf Geological characteristics, fluids properties and technological production aspects of the world’s largest extra heavy oil Orinoco basin
The world's largest heavy oil Orinoco basin has unique oil characteristics. Previous studies of its biomarkers have demonstrated that oils are subject to varying degrees of biodegradation. Oils belong to the same source with the same degree of maturity. The paper presents actual data obtained as a result of long-term geological exploration and data collection from past years in Venezuela. New oil samples obtained at different depths made it possible to accurately determine how the oil composition and properties change, depending on the degree of biodegradation and depth. New information, together with existing theories of the formation of ultra-high-viscosity oils, made it possible to form fundamentally different approaches to building PVT-models. A feature of the Orinoco heavy oil basin is the presence of two contacts with water - in the roof and at the base of the heavy oil volume. The contact with less dense fresh water in the roof part has a dominant and determining significance in the oil biodegradation. The cold method of extraction by long horizontal wells has been used for several decades. Oils at new sites turned out to be more viscous due to the high degree of biodegradation, which was not taken into account when preparing development projects. The presented data and approaches will allow more accurate prediction of oil properties and production capabilities in the future.

Keywords: extra heavy oil, oil biodegradation, PVT-model, Orinoco heavy oil basin, Venezuela.
article citation Ivanov D.A. Geologicheskie kharakteristiki, svoystva flyuidov i tekhnologicheskie osobennosti dobychi v samom krupnom v mire Orinokskom basseyne sverkhvysokovyazkoy nefti [Geological characteristics, fluids properties and technological production aspects of the world’s largest extra heavy oil Orinoco basin]. Neftegazovaya Geologiya. Teoriya I Praktika, 2024, vol. 19, no. 4, available at: https://www.ngtp.ru/rub/2024/33_2024.html EDN: DMAYUM
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