Source rock evaluation and petroleum system modeling of the South Barents and South Kara basins
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ORIGINAL ARTICLE
Source rock evaluation and petroleum system modeling of the South Barents and South Kara basins Peter Sobolev1 Received: 28 November 2017 / Accepted: 1 March 2018 © Springer-Verlag GmbH Germany, part of Springer Nature 2018
Abstract This paper presents the results of a recent study of two sedimentary basins located in the Russia Arctic shelf—the South Barents basin and South Kara basin. Both of them have a large sediment thickness, numerous potential source rocks with high organic carbon content, and are located on both sides of the Novaya Zemlya orogenic belt. Moreover, they are the most prolific hydrocarbon-producing basins in the Russian Arctic. However, the basins have a different geological history and many unique features. Organic geochemistry and petrography data were compiled for both basins and source rock intervals were identified. For the Barents sea, the most promising intervals from the geochemical data are the Upper Devonian marine carbonate facies, the Upper Carboniferous–Lower Permian marine carbonate–siliciclastic rocks, the Lower–Middle Triassic shallow marine shales and the Upper Jurassic deepwater black shales. In the South Kara basin, potential oil- and gas-prone source rocks can be found within many formations of the Jurassic–Cretaceous age. Regional Cenozoic uplift was estimated from well logs, and vitrinite and seismic velocity data. Petroleum system modeling combining seismic, well, and geological information was used to model the evolution of the basins and their petroleum systems. Keywords South Barents basin · South Kara basin · Source rock · Petroleum system modeling
Introduction The Eastern Barents sea and the Kara sea are the two richest petroleum provinces in the Russian Arctic shelf (Fig. 1). Both of these regions consist of giant gas fields; their total contribution exceeds 75% of both discovered and undiscovered Russian offshore resources [3, 7, 10]. The Eastern half of the Barents sea consists of two deep troughs—the South and North Barents basins filled with thick Paleozoic–Mesozoic successions. The Pechora sea is located southward and it is the shelf part of the Timan–Pechora basin. The fold belt of Novaya Zemlya represents the northernmost part of the Late Paleozoic Uralides and separates the Barents and Kara sea basin provinces. Similar to the Barents sea, This article was selected from the third Circum-Arctic Structural Event workshop which was held in Hannover (Germany) in March 2017. * Peter Sobolev [email protected] 1
A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Sredny Av. 74, St. Petersburg 199106, Russia
the Kara sea is divided into the South Kara basin and the North Kara basin. The deeper South Kara basin is filled with Mesozoic clastic sediments. All these basins are often combined together into the Barents–Kara shelf region (or the Western Russian Arctic Shelf). Though this region has been studied for over 40 years, many important geological questions remain unanswered, e.g., an assessment of the strong regional Ceno
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