Research project

Project fact sheet

Impact of sedimentology and early diagenesis on fractures in Lower Cretaceous carbonates of Oman

Project researcher(s): 
Claire N.H. Sena
Project supervisor(s): 
Dr C├ędric M. John
Project supervisor(s): 
Professor John Cosgrove
Duration: 
October, 2009 - February, 2013
Funding

 

The hypothesis to be tested  in this research project was wether and to what extent the depositional environment of Lower Cretaceous carbonate platforms controls rock texture and the potential for early diagenesis, and the impacts of the above parameters on the fracture potential of a given rock during early burial.

Once fractures are created, we hypothesed that they would channelize diagenetic fluid flow, and that diagenesis will be preferentially focused around the fractures.

 

The project is relevant to the oil and gas industry in Qatar as both fractures and diagenesis impact on reservoir quality.A better understanding of these fundamental processes will therefore improve subsurface predictions in Qatar.

Because we are interested in burial fractures, the outcrops were selected as far away as possible from the main deformation front of the Oman Mountains. We work  in south Central Oman, in the desert region of the Haushi-Huqf. Initial results have pointed out that lateral variabilities in facies exist: tidal flats are for instance laterally extensive, but are cross-cut by tidal channels, while some shoal deposits and dolomitized beds pinch out laterally. Fracture density seems to be largely a function of depositional facies.

Associated peer-reviewed publications: