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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Field
by Integrating
Geologic and Production
Data
1 Schlumberger Logelco, Egypt. DCS-CS
2 Schlumberger DCS Denver
3 General Petroleum Company (GPC)
Ras Gharib field
, located in the Gulf of Suez, Egypt, is a structurally complex
field
with a large number of faults and complex stratigraphy. Ras Gharib
field
has
been producing since 1930s. The
field
operator has realized the need for a
reservoir model to predict reservoir performance so as to optimize the recovery
of the remaining reserve. Previously only limited reservoir characterization was
performed, and the reservoir models that were built were unable to match the
field
production
data
despite significant modifications of petrophysical properties
of the models. The
field
development plans couldn’t confidently rely on these
models, as they didn’t have an adequate history match to the production
data
.
The factors that negatively affected the previous models were first screened. For
example
, it was realized that the main producing unit of the reservoir is highly
fractured, and the fact that no fracture property was modeled in the previous
models significantly affected the mismatch to the production history
data
.
A new modeling workflow was developed to improve the fracture characterization
of the reservoir with limited
data
. Faults were identified and faulting-induced
fractures were inferred from the fault patterns in the
field
. The descriptive faultpatterns
were further quantified and validated using the production
data
.
Because no image logs were available, production logs were used as feedback
to model the fracture properties. As drilling mud losses were recorded as a
qualitative indicator, a quantitative methodology based on an enhanced
geostatistical technique was developed to integrate them with the production
data
and faulting-induced fracture properties.
As a result of using a highly integrated modeling workflow that incorporates the
fracture characterization and property modeling, the reservoir model has shown
very good early history match to the field
production
data
. This has helped
determining the remaining reserves, and is to be used for the next phase
development planning of the
field
.