UAE foothills stratigraphy revisited: significance of dynamic tectonic controls on local to regional scales

UAE foothills stratigraphy revisited: significance of dynamic tectonic controls on local to regional scales

Tuesday 17th October 2017

Social gathering starts at 5:00PM

Presentation starts at 5:30PM

In recent years the structure and the stratigraphy of the foothills fold-thrust structures if the UAE –Oman mountain front have been extensively detailed, however, only limited integrated ‘cause and effect’ relationships have been attempted. Placing detailed stratigraphic relationships within a tectonic framework provides an elegant solution to many geologic scenarios that have been observed, especially ones where distinct local facies changes occur, unconformities are stacked upon each other and structural complexity appears inconsistent with depositional trends. We all have seen these tectono-stratigraphic relations in the field trips for the society to places such as Hafeet and Fayah, observing the Semail Ophiolite and its Late Cretaceous to Eocene cover sediments: hence this lecture will focus on bringing these field and map observations together, under the framework of the post-Wasia structural fold-thrust evolution of these foothill outcrops, highlighting what stratigraphic relationships can tell us. This also provides a framework of events and surfaces that can be extended into the onshore and offshore hydrocarbon province(s) of Abu Dhabi, which provides key understanding to the trap generation and overburden geology of these major resources.

Dr. Ewart has ~30 years industry experience, including a varied spectrum including applied research (Keele University, UK), service company (Robertson), major oil company (BP) and consultative work (Rock Deformation Research). He has worked on globally significant HC plays (N sea, GOM, M East, Far East) for all integrated energy majors. He graduated as a geologist from Cardiff University and conducted PhD research on the Variscan fold belt in SW Ireland (Cork University). A brief research assistantship at Queen’s University (Ontario) was an interlude between these. Trained as a structural geologist, he undertook 2 post-doctoral studies on tectonic controls on diagenesis / compartmentalisation in oil and gas reservoirs of the North Sea and adjacent areas prior to working globally. His focused expertise is on basin inversion dynamics, fault sealing processes in sandstones and on mechanical control of fractured carbonates. To date, Ewart has authored, or co-authored, >50 scientific papers and related articles. Having spent the last 13 years in ZADCO, he initially joined as a structural geologist in the seismic team, followed by discipline leader and manager of all geoscience and integrated modelling for UAE’s largest field, Upper Zakum. Currently, he is the senior specialist for geoscience in ZADCO, with responsibilities that include R&D coverage, overburden geology lead, and structural geology application (faults/fractures/rock mechanics).

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