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DESCRIPTION OF SALT DOME GEOLOGICAL STRUCTURE OF THE KASHAGAN FIELD, SOUTHERN PART OF PRE-CASPIAN DEPRESSION

AUTHOR/S: A. E. ASHRAF SOBHY
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 705-714 pp

ABSTRACT

The pre-Caspian basin has been formed from Paleozoic to Cenozoic time and the Kashagan
field is situated in the southern part of Pre-Caspian depression in the Southern flung of
Astrakhan-Aktyubinsk elevation system of basal complex and associated with Tengiz-
Kashagan interbasin carbonate platform. The platform is composed of separate carbonate
early Carboniferous blocks resting on the common Devonian (late Fransian-Fammenian)
carbonate base. Four of them are: Kashagan, Kashagan South-West, Aktote and Kairan are
located on the Caspian shelf and Karaton, Tengiz and Korolev on the coastal line of the
eastern Caspian. Depositions of Devonian through to Elephantine inclusive were penetrated
in Kashagan. The maximum section penetrated during drilling was 5172 m in KE-1. Presalt
and post-salt units separated by thick Kungurian of Lower Permian salt-bearing section
were identified in the well log. The description of the tectonics of the field was based on 3D
seismic and drilling data from КЕ-1, КЕ-2, КЕ-3, КЕ-5 for East Kashagan and 2D seismic
for West Kashagan where one well KW-1 was drilled. 3D seismic data provided more
detailed information about geology of the structure, facies distribution and main layer
thicknesses, and allowed a more accurate interpretation of tectonic faulting.