I guess our paper is appreciated!

Our paper reconstructing global methane seepage over the last 150 million years has been recognized in the Top 100 Scientific Reports Reports earth science papers in 2020!

\”A record of seafloor methane seepage across the last 150 million years\” by D. Oppo, L. De Siena & D. B. Kemp

Read it at A record of seafloor methane seepage across the last 150 million years | Scientific Reports (nature.com)

New paper on leaky salt in the Eastern Mediterranean

Thanks to a collaboration with colleagues at the Imperial College London, University of Napoli Federico II, University of Aberdeen, and Dalhousie University, we investigated the cross-evaporite fluid escape in the Eastern Mediterranean. You can read the paper here.

Despite salt being regarded as an extremely efficient, low-permeability hydraulic seal, an increasing number of cross-evaporite fluid escape features have been documented in salt-bearing sedimentary basins. Because of this, it is clear that our understanding of how thick salt deposits impact fluid flow in sedimentary basins is incomplete. We here examine the causes and evolution of cross-evaporite fluid escape in the northern Levant Basin, Eastern Mediterranean. High-quality 3D seismic data offshore Lebanon image hundreds of supra-salt fluid escape pipes distributed widely along the margin. The pipes consistently originate at the crest of prominent sub-salt anticlines, where overlying salt is relatively thin. The fact the pipes crosscut the salt suggests that hydrofracturing occurred, permitting focused fluid flow. Sequential pipes from unique emission points are organized along trails that are several kilometers long, and which are progressively deformed due to basinward gravity gliding of salt and its overburden. Correlation of pipes in 12 trails suggests margin-wide fluid escape started in the Late Pliocene/Early Pleistocene, coincident with a major phase of uplift of the Levant margin. We interpret that the consequent transfer of overpressure from the central basin area, in addition to gas exsolution from hydrocarbons already trapped in sub-salt anticlines, triggered seal failure and cross-evaporite fluid flow. We infer that other causes of fluid escape in the Eastern Mediterranean, such as subsurface pressure changes driven by sea-level variations and salt deposition associated with the Messinian Salinity Crisis, played only a minor role in triggering cross-evaporite fluid flow in the northern Levant Basin. Further phases of fluid escape are unique to each anticline and cannot be easily correlated across the margin. Therefore, despite a common initial cause, long-term fluid escape proceeded according to structure-specific characteristics, such as local dynamics of fluid migration and anticline geometry. Our work shows that the mechanisms triggering cross-evaporite fluid flow in salt basins vary in time and space.

New article showcased on EOS by AGU

Recently, Dr. Oppo et al. published a study on Scientific Reports where, by using methane-derived authigenic carbonates, they reconstruct the trends of methane emission from the global seafloor over the last 150 Ma (you can read it open access here). At the long geological time scale, the sea level change and the burial of organic matter have been identified as major controls on the methane release.
The article has been showcased on a science news piece on EOS, published by AGU.

Students doing well

With the start of the new Academic Year, we are continuing to showcase the SBRG work.

This time it was Cyle’s turn. He had a great time at the AAPG Student Expo in Houston, presenting some of his thesis research on the seismic interpretation of SW Gippsland Basin, Australia.

AAPG ACE 2019

I am so glad to announce that the first graduate of my research group here at the School of Geosciences has been amazing at presenting her work on the Tuscaloosa Marine Shale at the AAPG ACE 2019! And now she’s heading out to a full-time job at Shell in New Orleans! Great start for the Sedimentary Basins Research Group!

Methane seepage and carbonate build-ups formation

After a little bit of time, I\’m pleased to see on-line the paper I was working on during the last year!

Together with Martin Hovland, we used multi-channel 3D and 2D seismic data to investigate the role of methane seepage during the initial phase of growth of isolated carbonate build-ups in the NW offshore of Australia.

Check out the manuscript on publisher website or below

Great experience at GSA2018

I can certainly say that the GSA 2018 Annual Meeting in Indianapolis has been a success for the Sedimentary Basins Research Group!

Great work of all my attending students in presenting their research results to a varied and numerous number of attendees.

Next step, AGU 2018 in Washington DC!

ULL master student Grace Stone with her Tuscaloosa Marine Shale geochemistry project
Ai Lena Tomioka and Melody Chan, together with Prof. Andrew Moore and myself, showing a study on depositional dynamics of a tidal delta in Tanzania