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ABSTRACT: The New Point of View at Oil-Gas Area of NE Margin of Asia (Kamchatka-Koriakya Region)

SAVOSTIN, LEO A., A. E. BONDARENKO, and N. B. KUSNETCOV, Laboratory of Region Geodynamic, Moskow, Soviet Union

The hydrocarbon fields at Kamchatka-Koriakya are well known, so gas fields explored at western coast of Kamchatka at rocks of R3-N age. And oil-fields explored at central Koriakva (Markovskaya depression) at rocks of N-Q age.

We have analyzed the geological data for territory of the Lesnovskoye uplift (northwest of Kamchatka). The sedimentary rocks of MZ age crop out here at erosion windows. These rocks are tectonically covered by allohtone. Where they crop out along the Allohtone's front, they contain considerable concentrations of organic carbon and bitumin; also, they carry features of the migration of hydrocarbons. The published and original authors' data about stratigraphy and tectonic of northwest Kamchatka recognize that this region has potential prospective oil fields. We have proposed the evolution model of region which explain this thesis.

The sedimentary rocks of MZ age accumulated at large basins at the front margin of Asia from early MZ to early Paleocene. The thickness of sedimentary body near 1.5-2 km. The paleogeographical, lithological, and tectonic conditions were good for generation and conservation of hydrocarbons. The sedimentary body located at

region of high heat now over the subduction zone at 12-K1 and K2 time.

The oil-source rocks of MZ age were tectonically covered by allothone at K1. Allothone body consist of volcanogenic-siliceous rocks of K2 age. Formation of allohtone was accompanied by folding of sedimentary rocks of MZ age. The allothone surface slowly dislocated.

We conclude that under the large anticlines of allothone's surface (structural type of traps) in sedimentary rocks of MZ age concentrated considerable volumes of hydrocarbons. Equal situation may assume for Ukelaiatsky flysch depression (South Koriakya).

These regions still need to be studied. Only the results of geophysical investigations and drilling data may confirm or disprove this point of view.]


AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)