Sequential stratigraphic and facies analysis of Vendian terrigenous deposits at Srednebotuobinskoye field (the Mirny arch of the Nepa-Botuoba anteclise)

UDK: 553.98
DOI: 10.24887/0028-2448-2021-8-12-16
Key words: sequence stratigraphy, Nepa-Botuoba anteclise, Vendian terrigenous deposits, facies analysis, Srednebotuobinskoye field
Authors: E.I. Dolgova (RN-Exploration LLC, RF, Moscow), A.V. Yukhnevich (Taas-Yuryakh Neftegazodobycha LLC, RF, Irkutsk), N.V. Syrchina (Taas-Yuryakh Neftegazodobycha LLC, RF, Irkutsk), A.V. Gaiduk (RN-Exploration LLC, RF, Moscow), N.A. Redkin (RN-Exploration LLC, RF, Moscow), D.N. Zhestkov (Rosneft Oil Company, RF, Moscow)

In Eastern Siberia, many fields have been discovered in the Vendian terrigenous complex, including the large Verkhnechonskoye and Srednebotuobinskoye oil and gas condensate fields of Rosneft Oil Company. Despite the already existing large discoveries, the potential of the terrigenous complex in the region is still very great. The main problem in exploration work in these sediments is reservoir forecasting. The reason for this is the lack of understanding of the structure of the strata. Based on the knowledge-intensive geological and geophysical approaches used in the perimeter of Rosneft Oil Company, the authors managed to recreate the history of the formation of Vendian terrigenous sediments and identify the main promising areas of reservoir distribution.

This article is devoted to the sequence-stratigraphic and facies analysis of the Vendian terrigenous deposits at the Srednebotuobinskoye field. Due to integrated approach based on the study of well data (core, logging) and 3D seismic data, it was possible to restore the history of the formation of the terrigenous complex. For this stage of development, two sedimentation models of sedimentation were selected; the source of drift and the configuration of the paleoshore line were identified. Thanks to this approach, zones of distribution of potential reservoirs in the Talakh horizon were identified, as well as zones of deteriorated reservoir properties in the Botuoba horizon were identified, which were later confirmed by drilling exploratory wells. This approach helped to reduce risks in further exploration work and opened up new prospects at the field. In the future, such work will make it possible to ensure the identification of new promising objects at other fields of the Rosneft Company and to ensure the growth of new reserves.


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