... delivery efficiency. Due to its inherent physical characteristics of abundant geological weak layers such as bedding planes and fractures, the shale oil formation has relatively low bulk strength. Wellbore instabilities in this shale oil formation are prevalent when drilling highly deviated...

... vertical sample complex reservoir Brine shale gas fracture aperture Upstream Oil & Gas surface relaxation relaxation spectra gradient pore imbibition wettability source rock porosity pore space fracture bedding plane experiment relaxivity characterization cutoff time...

... enlargement. Numerous wellbore instability problems have been reported when drilling through the chemically active Nahr Umr shale formation in the Gulf area. What has escaped many drilling operators in this area is the in-situ fractured nature of the shale formation and the pronounced bedding planes in many...

... Abstract Sedimentology (lithology, sedimentary structures, bed thick-ness, mechanical stratigraphy, the nature of bedding planes), structural geology (tectonic setting, palaeostresses, subsi-dence/uplift history, proximity to faults, position in a fold, timing of structural events...