Abstract

This paper involves integration of data from various sources and of different scales (geology, seismic, borehole logs, cores and dynamic fluid information) which helps to properly characterize a reservoir and to build a reliable static model.

Reservoir characterization and modeling are most important part of all aspects related to the field development and also to the exploration. It can help to reduce the risks and to increase resources. It is an important multidisciplinary approach which allows reaching a reliable prediction and a better understanding of our reservoir and its heterogeneities which have a big impact on the fluid drainage.

This study consists in characterization and modelling the Triassic reservoirs of Oued Mya basin in order to define the best zones where to drill exploration and appraisal wells. The distribution of the reservoir sands across the field is considered to represent the greatest geological uncertainty in a depositional fluvial environment.

The deposition of the Triassic reservoirs occurred in an overall transgressive episode during the Late Triassic as fluvial valley fill and braid-plain quartz sandstones and eolian quartz sandstones. In such a system the channel sand-bodies display extensive heterogeneity and the prediction of net sand distribution is difficult.

According to the well logs evaluation those reservoirs are oil bearing in some studied wells, and some others are tight or water bearing situated structurally deeper. The sedimentological model which represents best the environment of our area of study subjected to the modeling would consist of two braided systems.

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