ГЕОХИМИЧЕСКАЯ ХАРАКТЕРИСТИКА ОРГАНИЧЕСКОГО ВЕЩЕСТВА АЧИМОВСКИХ ОТЛОЖЕНИЙ

The question of whether the Achimov clayey rocks belong to the oil-maternal rocks is still open due to the lack of sufficient factual material. The studied samples of argilllites have low or close to the lower limit of potentially oil-maternal rock Sorg content - 0.61-2.41%. The value of S1 (oil content in clayey rock), one of the main indicators of oil-generating properties of the rock, in these deposits is also very small and is 0.07-0.57 kg of oil per ton of rock (on average about 0.20 kg / t), which is much lower than the emigration barrier of 4.5 kg / t (according to Tissot and Welte, 1981). In this connection, we analyzed additional geochemical factual material on the Achimov and Lower-Middle Jurassic sediments (data of V.A. Skorobogatov, 1997) and constructed a series of graphs illustrating geochemical features of oil and gas accumulation processes in the Jurassic and Lower Cretaceous sediments on the territory of the Yamal Peninsula. [ABSTRACT FROM AUTHOR]