Print this pageReservoir Characterization of the Fluvial T.A.G.I. Sandstones, Central Ghadames Basin, Algeria
DRUMHELLER, RICHARD E., ROBERT P. DANIELS, and JEFFREY M. YARUS
The reservoir characterization of the Triassic Argileux Greseux Inferieur
(T.A.G.I.) fluvial sandstones in the central Sahara region of Algeria presents
the challenge commonly faced early in the development sequence of petroleum
reservoirs: a significant lack of specific local reservoir data.
The essential description of the reservoir necessary for proper production planning includes log and core data from the first few wells, indistinct local seismic information, production test data, which are complemented by extensive regional studies of the T.A.G.I., and by analogy with apparently similar fields elsewhere. The data was incorporated into 3-D stochastic models as it became available, and numerous geostatistical realizations were constructed for use in mapping and reservoir simulation studies. The stochastic model has been able to reasonably well represent the sedimentologic environments and to capture a measure of the reservoir heterogeneities present in the T.A.G.I.
The output from the stochastic modeling has proven very useful for all types of reservoir simulation, both 2-D and 3-D. The modeling products provided an important influence on initial sets of conventional deterministic geologic maps constructed for the benefit of production planning, and for an enhanced geological understanding to be applied to local field development and to further exploration in the region.