NEOCOMIAN PALEOGEOGRAPHY, GAS HYDRATE CEMENTATION OF SEDIMENTS, AND ABNORMAL SEQUENCES OF THE BAZHENOV FORMATION (West Siberia)
V.F. Grishkevich
OOO Lukoil-Engineering, KogalymNIPINeft' Filial, ul. Respubliki 41, Tyumen, 625000, Russia
Keywords: Баженовская свита, аномальный разрез, подводный оползень, палеогеография, палеобатиметрия, газогидратная цементация, Abnormal zone, submarine slide, paleogeography, paleobathymetry, gas hydrate, cementation, Bazhenov Formation
Abstract
Abnormal zones of the Bazhenov Formation originated in the Neocomian as a result of protobazhenite reworking by submarine slide and slump waste wedgings. But gas hydrate (GH) cementation might restrict the rock ability for plastic deformation. The conditions for GH thermodynamic stability in protobazhenites are inferred from reconstructions of paleogeographic and paleo-oceanic environments. Joint analysis of Neocomian marine paleodepths and deep water paleotemperatures provides an explanation of the Bazhenov abnormal-zone extension.
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