Print this pageAbstract: Complex Criteria for 
Estimation
of Reservoir Properties of
Heterogeneous Clastic Successions (Lower Triassic Seria in North Bulgaria)
AJDANLIJSKY, GEORGE K.
The Lower Triassic Sediments in the North Bulgaria are an important
oil and gas
reservoir. They are predominantly
fluvial,
braided-sandy successions
with eolian
intervals. The main task
of the study of their
reservoir properties is
the correct modeling
of the sedimentary geometry
and numerical
estimation of the reservoir
capacity of these
heterogeneous sediments.
Detailed lithofacial sections
will be prepared
using standard schematic
procedure for
determination of different
fluvial and eolian
types of selected outcrops
and cores,
covering all sedimentary
types in the
economically producing area.
Architectural-element analysis
with
determination of 3-D architectural
units of
different order will be
carried out using
collected 2-D lithofacies
data and
measurements of all types
of paleocurrent
indicators. The porosity
and permeability of
selected architectural units
will be measured
experimentally and in thin
sections with
estimation of the primary
porosity and
degree of lithofacies alteration.
The results
will be used to specify
internal 3-D geometry
of the studied successions
and for
typization of the architectural
unites in them
according to their reservoir
properties. The
different, both by quality
and order,
reservoir unites will be
defined after
computer processing of the
data obtained
and their correlation with
available logs of
the outcrops and wells studied.
A complex database applicable
in
reinterpretations and correlations
of the
existent well logs from
all productive
locations will be developed.
The final result
expected is to develop more
accurate criteria
for estimation
of the properties
of these
heterogeneous oil and gas
reservoirs in
North Bulgaria.
AAPG Search and Discovery Article #90940©1997 AAPG Foundation Grants-in-Aid