TY - JOUR

T1 - Catagenesis of Organic Matter and Petroleum Potential of Proterozoic and Phanerozoic Deposits of the Anabar–Khatanga Saddle

AU - Fomin, A.N.

PY - 2024/11

Y1 - 2024/11

N2 - The degree of organic-matter (OM) maturation in Proterozoic, Paleozoic, and Mesozoic deposits in the Anabar–Khatanga saddle has been determined from examination of the reflectance of macerals (mainly vitrinite). The Proterozoic deposits contain only graphite inclusions of uncertain origin. In the Cambrian, Devonian, and Carboniferous strata, OM has transformed predominantly to apocatagenesis grades (АC2–3). Similarly transformed OM (АC1–3) is found in the lower Permian Tustakh and Lower Kozhevnikova formations. In some wells and areas, the degree of OM catagenesis is not higher than МC12–МC2 grades (classification after A.E. Kontorovich). In the Upper Kozhevnikova Formation, catagenesis grades are within МC11–АC1 in the upper Permian and within МC11–МC3 2 in the Triassic. In the Jurassic deposits, OM has transformed to early mesocatagenesis grades (МC11–МC12) and reached МC2 at the most deeply buried segments. In the Cretaceous strata, OM is less transformed, corresponding to PC3–МC1 1 or, seldom, higher grades of catagenesis. Some complexes in the Permian, Triassic, and Jurassic–Cretaceous deposits with OM of moderate maturity might be petroleum-promising.

AB - The degree of organic-matter (OM) maturation in Proterozoic, Paleozoic, and Mesozoic deposits in the Anabar–Khatanga saddle has been determined from examination of the reflectance of macerals (mainly vitrinite). The Proterozoic deposits contain only graphite inclusions of uncertain origin. In the Cambrian, Devonian, and Carboniferous strata, OM has transformed predominantly to apocatagenesis grades (АC2–3). Similarly transformed OM (АC1–3) is found in the lower Permian Tustakh and Lower Kozhevnikova formations. In some wells and areas, the degree of OM catagenesis is not higher than МC12–МC2 grades (classification after A.E. Kontorovich). In the Upper Kozhevnikova Formation, catagenesis grades are within МC11–АC1 in the upper Permian and within МC11–МC3 2 in the Triassic. In the Jurassic deposits, OM has transformed to early mesocatagenesis grades (МC11–МC12) and reached МC2 at the most deeply buried segments. In the Cretaceous strata, OM is less transformed, corresponding to PC3–МC1 1 or, seldom, higher grades of catagenesis. Some complexes in the Permian, Triassic, and Jurassic–Cretaceous deposits with OM of moderate maturity might be petroleum-promising.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85209089251&origin=inward&txGid=0eec3ddb8730886d050ff58124f1409e

UR - https://www.mendeley.com/catalogue/3c714692-3c74-3b83-9133-74d363bb58fb/

U2 - 10.2113/rgg20244741

DO - 10.2113/rgg20244741

M3 - Article

VL - 65

SP - 1358

EP - 1365

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 11

ER -