Click to view page image in pdf format.
7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Reservoir
Characterization (on the Example of Bahar
Field
,
Azerbaijan)
Development Department, Karasu Operating Company, ISR Plaza, 340 Nizami Street, 8th floor, Baku
AZ1000 Azerbaijan, phone: 99412 4920857, fax: 994 197 5 1647, [email protected]
Currently hydrocarbon exploration in Azerbaijan is focused on the offshore sector, where detail prediction of deposition
environments and reservoir
architecture is problematic due to limited core recovery and absence of accurate
reservoir
models. That's why Bahar oil-gas
field
were chosen for modelling.
A variety of stochastic models have been employed to stimulate the architecture of hydrocarbon reservoirs of fluvial -deltaic
origin. In this report we concentrated on object-based models particularly designed for geological problems requiring the
discrete variables' prediction. As a visualization tool we used well-known Reservoir
Modelling System (RMS-6.1).
Several types of data observed in wells were included as input to the program: 1) sedimentary units' identification and thicknesses; 2) permeability/porosity observations from plugs/logs; 3) interpretation of channel/channel belts as being present in one or more wells. Some assumptions (like paleo-currents direction, sand/shale ratio) necessary for the model run were made basing on outcrops analogue data.
On the basis of existed premises and digitised data the reconstruction of paleogeographic environment (allowed to reveal
several important facies associations- fluvial, delta plain, delta front, prodelta- differed from each other by clay and sand
content, grain size, thickness, lateral continuation) and 3Dmodeling of sedimentary architecture (together with reservoir
properties' petrophysical
simulations
) for upper section of Lower Pliocene sedimentary unit were carried out.
Such modelling represents the greatest promise for the thorough understanding of a real reservoir
3Dgeometry. However,
integrated information from other sources (seismic data, tectonics) must be used for complete
reservoir
evaluation.
The work was fulfilled within the frames of project supported by NWO/WOTRO scientific foundation (#WB75-385).