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PESA SA/NT Technical Luncheon, Thursday 27th June – A tale of two volcanic provinces: using seismic reflection data to probe ancient volcanic plumbing systems in the Bight Basin and North Sea
Thursday, 27 June, 2019 @ 12:00 pm - 2:00 pmFree
PESA SA/NT June Technical Luncheon
A tale of two volcanic provinces: using seismic reflection data to probe ancient volcanic plumbing systems in the Bight Basin and North Sea
When: Thursday 27th June, 12pm for 12:30
Where: Ayers House, 288 North Tce, Adelaide
Speaker: Simon Holford (Australian School of Petroleum)
An important geological risk associated with exploration in many sedimentary basins that formed due to lithosphere extension is the presence of igneous rocks. Whilst hydrocarbon exploration has traditionally overlooked basins containing igneous rocks, the past decade has witnessed the development of an array of new interpretative tools and workflows for characterising both intrusive and extrusive igneous rocks and related phenomena using 3D seismic data. This presentation will highlight the application of 3D seismic data to understand the plumbing systems of ancient, buried volcanic provinces in both frontier and mature regions for hydrocarbon exploration. The main focus of the presentation is the Bight Basin, where 3D seismic data permit the study of an extensive province buried volcanoes and their intrusive plumbing system in unprecedented detail. Although situated on a passive margin, early Cenozoic magmatism in the Bight Basin occurred subsequent to continental breakup and is expressed by a variety of submarine volcanic landforms, fed by abundant sills, dykes and laccoliths emplaced into underlying deltaic sequences. The Bight Basin is contrasted with the Jurassic Rattray Volcanic Province, located at the triple junction of the North Sea triple junction. Long thought to be sourced from a series of large central volcanoes, the re-interpretation of 3D seismic and well data shows that no such volcanic centres exist, and that the volcanics were erupted through dyke-fed linear fissure zones. The presentation will examine the implications for hydrocarbon exploration in these study areas, and in other extensional basins containing syn and post-rift igneous rocks.
Simon Holford is an Associate Professor of Petroleum Geoscience at the University of Adelaide’s Australian School of Petroleum, where he co-leads the Stress, Structure & Seismic Research Group. Simon has published ~90 papers on the prospectivity and tectonics of rifted margins, petroleum geomechanics and magmatism in basins. Simon has successfully supervised ~10 PhD students and ~50 Honours and Masters students. Simon has a PhD from the University of Birmingham and a BSc(Hons) from Keele University. Simon was President of the SA/NT branch of PESA during 2015-2017.
Lunch will include a 2-course meal and drinks
Please note that bookings will close at 5pm on Monday 24th June