In the Gulf of Suez, a unique type of oil reservoir is gaining attention. These reservoirs are not made of typical rock layers but of fractured basement rock, like weathered granite. The Geisum Oil Field, located in the southern part of the Gulf, is a prime example of where these types of reservoirs are found.

To understand these reservoirs better, a team used advanced tools. They combined data from well logs, such as Formation MicroImager (FMI) and resistivity anisotropy analysis, with 2D seismic interpretation. This approach helped them map out the fracture networks, measure the size of the fractures, and understand how the structure of the rock affects the reservoir's quality.

The study found three main directions for the fractures: northeast-southwest, northwest-southeast, and east-northeast-west-southwest. These directions align with the regional stress patterns. The largest fractures found were about 0. 7 millimeters wide, located in the uppermost part of the basement rock. These fractures correlate with areas of higher porosity and permeability, which are crucial for oil to flow through the rock.

However, the study also highlighted some risks. The geometry of the faults can increase the density of fractures, creating better pathways for oil to move. But, if the faults are not properly sealed, they can also allow oil to escape, leading to potential losses.

This research provides a valuable framework for exploring similar basement reservoirs in other rift-related settings around the world. It shows that while fractures can enhance the storage and flow capacity of these reservoirs, careful evaluation of fault seals is necessary to prevent leakage.

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