TY - JOUR

T1 - The structure of cambrian deposits of the Vilyui hemisyneclise, based on an integrated analysis of drilling and seismic data

AU - Gubin, I. A.

AU - Kontorovich, A. E.

AU - Korovnikov, I. V.

AU - Parfenova, T. M.

N1 - Funding Information: The study was performed as part of the basic research program (project No. 0331-2019-0018) “Construction of Geological Models and Assessment of Hydrocarbon Potential of the Phanerozoic and Neoproterozoic Sedimentary Complexes of the Lena–Tunguska Petroleum Province for Compilation of Program of Exploration and Licensing of Mineral Resources” and (project No. 0331-2019-0003) “Paleontological and Ecostratigraphic Substantiation of Zonal Stratigraphic Schemes of the Paleozoic of Siberia, Paleogeographic and Biofacies Zoning of Sedimentary Basins.” Publisher Copyright: © 2021, Novosibirsk State University.

PY - 2021

Y1 - 2021

N2 - We present a model of the stratigraphic and lateral distribution of Cambrian deposits in the Vilyui hemisyneclise, based on an analysis of drilling data and interpretation of seismic data. The study shows a series of formations and sequences penetrated by wells (Syugdzher saddle, Khorgochum monocline, Ygyatta depression, Tyukyan–Chybyda monocline, Arbai–Sinyaya megaswell, etc.). In the areas where the Cambrian was not penetrated by wells, the distribution of Cambrian deposit was inferred based on the available seismic data. The distribution of the Kuonamka Horizon formed by Cambrian organic-rich rocks is characterized in detail. These are the Kumakh and Sinyaya–Kutorgina sequences and the Inikan and Kuonamka formations. It has been found that the Kuonamka Horizon was deposited during two stages, Botomian and Toyonian–early Mayan. The horizon is overlain by younger deposits of the Mayan Stage, with character-istic cross-bedding structures. Schemes of facies zoning of the Cambrian for Botomian, Toyonian–early Mayan, and middle Mayan times were constructed based on the most recent geological and geophysical understanding of the Vilyui hemisyneclise.

AB - We present a model of the stratigraphic and lateral distribution of Cambrian deposits in the Vilyui hemisyneclise, based on an analysis of drilling data and interpretation of seismic data. The study shows a series of formations and sequences penetrated by wells (Syugdzher saddle, Khorgochum monocline, Ygyatta depression, Tyukyan–Chybyda monocline, Arbai–Sinyaya megaswell, etc.). In the areas where the Cambrian was not penetrated by wells, the distribution of Cambrian deposit was inferred based on the available seismic data. The distribution of the Kuonamka Horizon formed by Cambrian organic-rich rocks is characterized in detail. These are the Kumakh and Sinyaya–Kutorgina sequences and the Inikan and Kuonamka formations. It has been found that the Kuonamka Horizon was deposited during two stages, Botomian and Toyonian–early Mayan. The horizon is overlain by younger deposits of the Mayan Stage, with character-istic cross-bedding structures. Schemes of facies zoning of the Cambrian for Botomian, Toyonian–early Mayan, and middle Mayan times were constructed based on the most recent geological and geophysical understanding of the Vilyui hemisyneclise.

KW - Cambrian

KW - Drilling data

KW - Inikan Formation

KW - Kuonamka Formation

KW - Reef buildups

KW - Seismic facies analysis

KW - Time section

KW - Vilyui hemisyneclise

UR - http://www.scopus.com/inward/record.url?scp=85114618113&partnerID=8YFLogxK

U2 - 10.2113/RGG20214353

DO - 10.2113/RGG20214353

M3 - Article

AN - SCOPUS:85114618113

VL - 62

SP - 914

EP - 928

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 8

ER -