Oil & Gas
Saturation of Upper Cretaceous Sediments in Southern Part of
Bochkarev, Vitaly
A.1, Eurídice J. Solórzano Sanchez2,
Alexander I. Grigorev3, Raul Gataulin1 (1) N/A,
The oil deposits in the Oligocene (Merecure Formation) and lower Miocene (Oficina
Formation) of the OHOB have been formed by processes of remote migration
(several hundreds kilometers) of hydrocarbons from upper cretaceous oil source
rock contained in Querecual and San-Antonio
Formations and to lesser extent the subject migration processes was facilitated
by the Lower Miocene Oficina Formation as well.
Oil-and-gas content in Cretaceous
sediments for this area have been confirmed by log but it hasnxt
been confirmed by tests and core analyses. According to log interpretation of Junín block, we have detected oil content of Upper
Cretaceous sediments of the southern part of the block (wells # IZZ0034,
IZZ0036, IZZ0091). According to 2D seismic interpretation, the general tendency
of increasing of Upper Cretaceous and Oligocene-Miocene thicknesses from the
south to the north are observed. In the northern part of the block the
Cretaceous Unconformity was detected by biostratigraphics
studies, in the southern part of the block the Cretaceous is eroded and in the
middle part was estimated by correlation.
Considering а huge area of Upper
Cretaceous sediments extension in the southern part of the block it is possible
to estimate their oil resources as hundreds millions barrels. For confirmation
oil saturation and resources estimations of Upper Cretaceous sandstones in the
southern part of OHOB it is necessary to select core and to make tests of these
sediments in new wells.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California