-
oa BSR Distribution From Newly Acquired 2D Seismic and the Potential Link to Thermogenic Petroleum Systems, Offshore Newfoundland and Labrador, Canada
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Newly acquired 2D broadband seismic data has led to new data coverage over the slope and deep water regions of the margin. In other petroleum exploration regions there are several examples of attempts to link active thermogenic petroleum systems to the occurrence of bottom simulating reflectors. Given the recent increase in seismic data coverage and ongoing seabed sampling programs, are there new observations derived from this dataset that can lend support to the previous efforts undertaken along the Eastern Canadian margin? Four cases of mapped BSR’s are highlighted in this study, with emphasis on relating the newly acquired seismic data to observations from previous studies. Some BSR’s exist near mapped AVO anomalies with associated faults, potentially feeding the gas hydrates from depth. At the Mizzen oil discovery, the BSR in that region may be related to migration of hydrocarbon from a proven thermogenic petroleum system. Conclusions of previous studies assessed some thermogenic hydrocarbon input to the hydrate and implied charge from depth. Heat flow measurements associated with the seabed coring program also support higher gradients in the slope to deepwater areas. This would support the addition of thermogenically derived C2+ gases in order to explain the hydrate stability depth observed.
