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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
Albert V. Carozzi*
* Professor of Geology, University of Illinois at Champaign--Urbana, Urbana. Illinois. 61801, USA, and International Oil Exploration Consultant.
Abstract
ray
diffraction
data. Five distinct sedimentary models were recognized. Fluvio-deltaic model
consisting of fluvial, deltaic, distal deltaic and offshore subenvironments. Tidal
flat model consisting of marshes, intertidal flat, shoreface and offshore
subenvironments. Beach model consisting of dunes (inferred), beach,
shoreface and offshore subenvironments. Glacial model / Glacial model
(Curiri time, Late Devonian) consisting of glacial (tillites with subglacial sandstone
channels and interglacial braided streams), shoreface and offshore subenvironments. From
the association of these depositional models, the direction and intensity of the supply of
coarse clastics was determined in a semi-quantitative manner for each stratigraphic unit.
The time and space distribution of the detrital supplies and of the areas of coarse
clastic sedimentation indicates a continuous synsedimentary tectonic control of the
depocenters by the differential subsidence of the underlying Precambrian basement in the
shape of large blocks limited by a system of NW-SE and NE-SW lineaments. By using an index
of synsedimentary tectonic activity it is possible to define three major episodes of
coarse clastic sedimentation which have the best reservoir potential: Early Silurian
fluvio-glacial systems, Early Devonian prograding deltas and Late Devonian fluvio-glacial
systems. The traps for hydrocarbons are mainly stratigraphic but enhanced by the weak
structures of the basin and result from the relationship between the coarse clastics and
two intervening sequences of mature black shales.
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