Geological and geochemical concept of petroleum system formation on the territory of the project «Remote group of fields» in the area of operation of Gazpromneft-Noyabrskneftegas LLC

UDK: 551.263
DOI: 10.24887/0028-2448-2019-12-21-25
Key words: Yanov Stan formation, Bazhenov formation, migration, accumulation, hydrocarbons, exploration
Authors: N.V. Morozov (Gazpromneft NTC LLC, RF, Saint-Petersburg), D.Yu. Kalacheva (Gazpromneft NTC LLC, RF, Saint-Petersburg), O.A. Zakharova (Gazpromneft NTC LLC, RF, Saint-Petersburg), M.V. Bukatov (Gazpromneft NTC LLC, RF, Saint-Petersburg), S.A. Pogrebnyuk (Gazpromneft NTC LLC, RF, Saint-Petersburg), F.G. Gaynetdinov (Gazpromneft-Noyabrskneftegas LLC, RF, Noyabrsk), M.N. Nikolaev (Gazpromneft-GEO LLC, RF, Saint-Petersburg)

Petroleum systems analysis is an effective tool for evaluation risks of generation, migration, accumulation and preservation of hydrocarbons. In this paper we consider the main results of geochemical studies of the organic matter of rock samples and upper Jurassic fluids in the territory of a remote group of fields which are included in the area of operation of Gazpromneft-Noyabrskneftegas LLC. According to the results of geochemical studies, it was found that the main genetic source for the oil samples within the study area is Bazhenov formation, which indicates that hydrocarbon deposits in the territory of a remote group of fields formed mainly due to lateral migration from the kitchen area of Bazhenov formation in more submerged zones. Based on an in-depth study of the distribution of biomarker hydrocarbons in oil and extract samples, it was possible to establish boundary zones for the hydrocarbon migration range. Using geochemical data, the study area was ranked according to the degree of prospectivity of the presence of hydrocarbons. The study of the work was reducing of geological uncertainties associated with the prediction of the traps filling in an area remote from the generation sources over a considerable distance (more than 115 km). Based on the developed geological and geochemical concept of the deposits formation, the study area was ranked according to the degree of prospect filling the traps in the Yanov Stan and Sigov formations, which allowed us to adjust the exploration program, reassess geological chance of success (GCoS) risks associated with the parameters of oil migration from sediments of Bazhenov formation to a trap in the proposed accumulation zone within the Yanov Stan formation.


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