A.A. Rasskazov, A.M. Karpov
Relationship between presence of gas in Middle Jurassic sediments and Permian-Triassic magmatism in collision zone of Palaeozoic Basement in the Yamal Peninsula field
DOI 10.47148/0016-7894-2026-4-21-34
Key words: Yamal Peninsula; pre-Jurassic Basement; hydrocarbon potential; rifting; magmatism; basement collision zone; inter-rift zone; volcanism; dish-shaped intrusions.
For citation: Rasskazov A.A., Karpov A.M. Relationship between presence of gas in Middle Jurassic sediments and Permian-Triassic magmatism in collision zone of Palaeozoic Basement in the Yamal Peninsula field. Geologiya nefti i gaza. 2026;(4):21–34. DOI: 10.47148/0016-7894-2026-4-21-34. In Russ.
Acknowledgments: The authors express their sincere gratitude to A.A. Pashinsky and T.S. Rychkova for their comprehensive support and invaluable assistance in preparing this paper.
Due to the depletion of hydrocarbon reserves in the West Siberian Cretaceous series, the focus of geological exploration aimed at replenishing the resource base is shifting toward the development of the deeper horizons. Among the geological exploration priorities on the Yamal Peninsula, the leading role is assigned to evaluation of hydrocarbon potential of the Jurassic series and studies of the pre-Jurassic Basement. Based on the results of high-density 3D seismic surveys conducted in 2019–2021, a hypothesis of possible relationship between the gas-bearing potential of the Jurassic series and structural features of the pre-Jurassic Basement formed under conditions of Permian–Triassic magmatism was proposed. Subsequent exploration, prospecting, and development drilling confirmed this relationship through the occurrence of the maximum gas-saturated intervals and productivity of Jurassic development wells in the collision zone of Basement blocks. The authors suggest a deep origin for Jurassic hydrocarbons whose generation and migration is controlled by the regional occurrence of paleovolcanoes and deep-seated faults formed along the collision zone of the pre-Jurassic Basement. The paper presents the information concerning the influence of magmatism on the Organic Matter maturity and possible spatial distribution of gas accumulations in Europe, Latin America, and the Pacific region. The authors discuss the possibility of hydrocarbon generation along the contact zones between intrusive bodies and Palaeozoic Organic Matter or formation of the own biogenic elements caused by volcanic activity and weathering of volcanic and Basement rocks. Finally, in accordance with the identified geological relationships a set of criteria is proposed to optimize both exploratory and development drilling targeting the Middle Jurassic interval.
Anatoliy A. Rasskazov ORCiD
Deputy Chief Geologist
JSC Yamal LNG,
22, ul. Academician Pilyugin, Moscow, 117393, Russia
e-mail: a.rasskazov@yamalspg.ru
Anatoliy M. Karpov ORCiD
Expert
PAO NOVATEK,
90/2, Leninsky prospect, Moscow, 119313, Russia
e-mail: anatoliy.karpov@novatek.ru
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