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Geologic Interpretation of Basic Seismic-acoustic Attributes for Developing a Geodynamic Model of Chukot Earth’s CrustNormal access

Authors: E.Y. Goshco, A.V. Migursky and A.S. Salnikov
Event name: 4th EAGE St.Petersburg International Conference and Exhibition on Geosciences - New Discoveries through Integration of Geosciences
Session: Onshore Frontier Exploration & Basin Research II
Publication date: 04 May 2010
DOI: 10.3997/2214-4609.20145419
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 849.48Kb )
Price: € 20

Summary:
Seismic-acoustic inversion of the CDP section of the 2-DV-A reference profile running from the Pevek (Chaun Bay) to the Valunistoye (Central Chukot) has resulted in basic dynamic and geometrical characteristics such as an average reflector dip, and integral reflector energy. It is established that the behavior of a crust-mantle layer «Moho» is quite accurately observed on the seismic acoustic section. The integral energy section appears to be useful for identifying crustal blocks. The analysis of reflector dips on the 2-DV-A profile has shown that in its northwestern part (0–200 km) in the crystalline crust the inclination of reflections prevails obviously to the southeast. In the interval of 200-205 km in the crystalline crust and uppermost mantle, the vertical column of reflections with the northwestern inclination serving as a sharp boundary between large blocks of the Chukchi microcontinent has shown itself clearly. From 390 to 520 km the northwestern reflector inclinations are dominant in the crystalline crust, which corresponds to the movement of microblocks of the Koryak accretionary belt. The use of basic seismic-acoustic attributes for geologic interpretation has supported the validity of the developed deep geologic-tectonic model of the earth’s crust of the northern and central Chukchi microcontinent.


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