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UDC (550.843:551.22):551.732.2(571.5)
ANALYSING THE POSSIBLITY TO MAP INTRUSIVE BODIES BASED ON SIESMIC DATA IN EASTERN SIBERIA: A CASE STUDY FROM THE MUNTUL’SKY SITE
S. V. Kotova, G. D. Ukhlova, E. G. Keller, I. V. Litavrin
The paper considers trap magmatism at the Muntul’skaya area located in the junction zone of the Baikit anteclise and the Cis-Sayan-Yenisei syneclise. Within the area of interest the sills are mainly localized in the Usol’e Formation. The reflector matched with the Usol’e sill top in seismic sections was tied to and correlated with stratigraphic units. The drilling data and wavefield parameters of the seismic sections imply that intrusive bodies are distributed only in the eastern part of the studied area. Within the Usol’e sill intervals the seismic sections show a sharp increase in time thickness; sudden changes in the reflecting horizon geometry with a near-horizontal occurrence of over- and underlying layers; a local rambling distribution of non-extended events of a various intensity under the sill top. Besides, there are a number of near-vertical bodies in the seismic sections with no regular seismic reflections. These bodies are probably associated with destruction zones. There are several steeply dipping reflections, where the sedimentary cover adjoins the body. Various seismic amplitude attributes were used to increase the imaging quality.
Key words: Siberian Platform, magmatism, Lower Cambrian, Usol’e sill, seismic section, wavefield.
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