Journal of Petroleum Geology, Vol.11,
No.1, pp. 5-60, 1988
©Copyright 2000 Scientific Press,
Ltd.
STRATIGRAPHY AND ROCK UNIT
NOMENCLATURE IN THE OIL-PRODUCING AREA OF INTERIOR OMAN
Michael W. Hughes Clarke*
*Geological Consultant, Petroleum
Development Oman LLC, P. O. Box 81, Muscat, Sultanate of Oman.
Abstract
The sedimentary rock sequence in the
oilfield areas of Interior Oman ranges from the Late Proterozoic
through Paleozoic, Mesozoic and Tertiary. A number of major gaps
or changes in sedimentation are recognised, and these punctuate a
subdivision into major rock units ranked as groups. Eleven named
groups are recognised: in stratigraphic order from oldest Huqf
(Upper Proterozoic), through Haima (Lower Paleozoic), Misfar
(Devonian), Haushi and Akhdar (Carboniferous to Triassic), Sahtan
(Jurassic), Kahmah (Lower Cretaceous), Wasia (Middle Cretaceous),
Aruma (Upper Cretaceous), Hadhramaut (Paleogene) to Fars
(Neogene). Most of these groups are further subdivided and 35
named formations are described giving lithologic characteristics,
boundaries, inferred age span and van-ability. These descnptions,
together with reference well sections indicating wire-line Iog
characteristics, provide a sufficient basis for consistent future
use of the rock units.
