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Sunny Singhroha defends thesis on distribution and quantification of gas hydrates and free gas on Vestnesa Ridge

Gas hydrates are crystalline structures containing large amounts of methane, often located in climate-sensitive polar environments. They are found in large quantities at Vestnesa Ridge on the western Svalbard Margin, a place also characterized by an extensive occurrence of active gas seepage (primarily of methane) from pockmarks on the seafloor. Gas hydrates hold potential as a ‘fuel of the future’ while simultaneously posing a risk as a geohazard and an accelerator of climate change. While we are only beginning to understand them, it is crucial to determine the location and quantities of gas hydrates that are stored in marine sediments.

This study, conducted by Sunny Signhroha of CAGE, uses various geophysical methods and techniques to detect gas hydrates on the Vestnesa Ridge, including a novel technique that estimates the seismic quality factor Q from broad-bandwidth (20-300 Hz) high-resolution P-Cable 3D seismic data in order to directly detect gas hydrates in marine sediments. Furthermore, the study includes a detailed analysis of P- and S-wave seismic velocities (through travel time and full waveform inversion) as well as an azimuthal velocity analysis using ocean-bottom seismic data. The P- and S-wave velocity models developed in the thesis are used to estimate gas hydrate saturation with the help of the SCA/DEM rock physics model. The combined analysis of these results suggests the occurrence of gas hydrates lying in fractures and faults along the Vestnesa Ridge. The variations in gas hydrate saturation and morphology across these faults indicates a strong structural control of this gas hydrate system.

Singhroha publicly defended his PhD thesis entitled “Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard” on June 18th 2019 at UiT The Arctic University of Norway. This work was funded by the Centre for Arctic Gas Hydrate, Environment, and Climate (CAGE) at UiT.

To find out more, read the two academic articles based on the findings of this research:

Gas hydrate and free gas detection using seismic quality factor estimates from high-resolution P-Cable 3D seismic data

Constraints on Gas Hydrate Distribution and Morphology in Vestnesa Ridge, Western Svalbard Margin, Using Multicomponent Ocean‐Bottom Seismic Data

19. June 2019

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Sunny Singhroha

Researcher
sunny.singhroha@uit.no

Sunny Singhroha is a researcher in the Gas Hydrate and Free Gas Reservoirs group.

Read more about Sunny Singhroha

Contact

Stefan Bünz

Team leader
+47 77 64 62 66
stefan.buenz@uit.no

Stefan Bunz. Photo: Torger Grytå

Stefan is team leader for the research group Gas Hydrate and Free Gas Reservoirs at CAGE, as well as temporary co-assistant director.

Read more about Stefan Bünz

23. July 2019

US Naval Academy visits CAGE

14. June 2019

Kate Waghorn defends thesis on the creation of gas hydrate systems of non-biological origin

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