Oil and gas seepage offshore Georgia (Black Sea) – Geochemical evidences for a paleogene-neogene hydrocarbon source rock
نویسندگان
چکیده
Numerous hydrocarbon seep sites at the continental shelf, slope, and in deep water basin are known to feed Black Sea reservoir of dissolved methane. In this study, we identified likely sources gas oil that emitted four located on slope offshore Georgia Eastern 830 1,140 m depth – an area with seepage only (Batumi area) three areas coupled (Iberia Mound, Colkheti Seep, Pechori Mound). The geochemistry bulk parameters, organic fractions individual biomarkers near-surface sediments gas/oil expelled from seafloor was analyzed jointly interpreted assign most source rocks studied region. Presence oleanane shallow oil-impregnated slicks attests rock all is younger than Mid Cretaceous age. We conclude hydrocarbons ascending originate Eocene Kuma Formation and/or Oligocene–Lower Miocene Maikop Group, which considered principal Distributions crude suggests moderate heavy biodegradation. C1/C2+ ratios (10–4,163) along stable C H isotopic (?13C–CH4 ?46.3 ?53.1.3‰ V-PDB; ?2H–CH4 ?159 ?178‰ V-SMOW) indicate mixtures oil-associated thermogenic secondary microbial light discharged sites. Light Batumi Seep characterized by significant enrichments methane, but have almost similar ?13C–CH4 values if compared other study Such methane result a comparably higher degree petroleum degradation associated formation
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ژورنال
عنوان ژورنال: Marine and Petroleum Geology
سال: 2021
ISSN: ['0264-8172', '1873-4073']
DOI: https://doi.org/10.1016/j.marpetgeo.2021.104995