Third EAGE Workshop on Naturally Fractured Reservoirs
Please note we have reached full capacity and can no longer accommodate space for the Field Trip, however space is still available for your participation at the Workshop.
Faults and fractures corridors in the Natih carbonates of Jabal Madmar
Located in the Salakh Arch, in the foothills of the Oman Mountain, the Jabal Madmar anticline is a widely recognised field-scale fractured carbonate reservoir analogue. Due to exceptional outcropping conditions, it offers rather unique opportunities to observe the natural fracture system occurring in the Cenomanian Natih carbonates. The analogy between Jabal Madmar and some of the largest North Oman Natih subsurface reservoirs is enhanced by strong similarities in terms of rock depositional environments and by comparable structural evolutions. The sector selected for this field trip is located to the South of the structure, where the intensely deformed flank of the fold is exposed. It exhibits a spectacular fracture pattern which can be observed in 2D and 3D from the scale of bed-constrained opening-mode fractures (“background fractures”) up to fracture corridors and sub-seismic scale fault zones. The Natih carbonate section also includes vertical lithological and rheological contrasts. This enables to set-up a clear mechanical stratigraphy framework across the stratigraphic column and to observe how this framework controls the respective occurrence, propagation and distribution of the various fault and fracture types.
The field trip will involve a relatively long drive from Muscat to the city of Adam (3h30, approximate duration). During this travel the field trip attendees will be able to observe a succession of landscapes ranging from the world-famous Sumail ophiolite units to the collision belt of the Oman Mountains and to the desertic areas of the country Interior. An effort will be made on the outcrops to replace the local observations within the larger-scale context of the regional geology.
Illustration: A South-North section through Natih Carbonates in the southern flanc of Jabal Madmar