Abstract

The Oued Mya Basin is one of the most oil-productive basins in Algeria. The wells’ productivity in these low permeability Ordovician reservoirs is attributed to the interconnected fracture networks. The faults and fractures characterization were carried out on two approaches. The first approach consists of the analysis of faults picked from 3D seismic volume and the second comprises the analysis of the sub seismic faults digitized from different seismic attributes and wellbore imagery analysis. Two trends of faults are highlighted and separated by a syncline oriented in the same direction. This architecture seems to be the result of several tectonic events, with a complex fault system-oriented NNE-SSW and interspersed with another of the sub-orthogonal fault system. The two orthogonal fault systems compartmentalize the region into horsts and grabens. The different fracture sets are connected and can contribute significantly to the productivity of this reservoir. The SHmax is homogeneous in the region, it is oriented NW-SE with a reorientation NE-SW to NNE-SSW at the wells of Berkaoui field and Guellala field, indicating diagram concordant with a transcendent dextral strike-slip fault. Wells showing the presence of trace of hydrocarbons can be stimulated by targeting fracture parallel to the maximum horizontal stress to improve the reservoir fluid flow.

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