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УДК [(552.32+553.98.044):550.83]:551.72/.78(571.5-16)
TUNGUSKA BASALTIC PLATEAU AND PREDICTION OF HYDROCARBON ACCUMULATIONS IN UNDERLYING DEPOSITS
V. S . Staroseltsev, T. A. Divina, M. I. Muratov
In the paper the authors justify high hydrocarbon potential of the northwestern Siberian Platform covered by the Triassic Tunguska basaltic complex, which overlies the most complete in terms of stratigraphy and the thickest interval of the Paleozoic deposits. In the beginning of the paper the authors emphasize differences between regional geological structure of the Tunguska basaltic complex and underlying deposits of its western and northeastern margins, where tectonic activity was fundamentally different during the whole Riphean-Phanerozoic time. The deep drilling data show that the thickness of the trappean intrusions within the underlying Paleozoic deposits reaches 30–40% of the entered successions within the area of widespread tuffaceous formations and almost absent basalts. Though, in the wells drilled in the regions with a large gross thickness of basalt flows this percentage falls by 3–8%. Occurrence of extended trappean intrusions highly complicates seismic survey and drilling. Special attention is given to a possibility to predict the Paleozoic highs buried below the basaltic complex, applying statistical figures of the network of linear structures deciphered by aeroimages. Occurrence of oil and gas within these highs may be appraised by gas testing by turning of bottom sediments of present-day water basins and streams.
Key words: basaltic complex, volume of trappean intrusions, prediction of buried highs, gas testing by the turning method.
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