National Assessment of Oil and Gas Project, Northern Alaska Province (001). Petroleum Systems and Geologic Assessment of Gas Hydrates in Northern Alaska 2008. Limits of the Gas Hydrate stability zone contour lines

• Main Author: United States Geological Survey
• Format: Dataset
• Language: unknown
• Published: U.S. Geological Survey 2008
• Subjects: Methane hydrate; north slope; Alaska
• Online Access: https://dx.doi.org/10.5066/p9iob90o; https://www.sciencebase.gov/catalog/item/60abf6d1d34ea221ce51f606

The limits of Gas Hydrate (GH) stability zone contour lines (GH stability thickness zero) shown here is a geographic boundary defined and mapped on basis of U.S. Geological Survey Digital Data Series DDS-35 Gas Hydrate assessment contours that were created in Support of the 1995 National Assessment of United States Oil and Gas Resources. The 1995 CD-ROM released digital map data, figures, and text used in the "1995 National Assessment of United States Oil and Gas Resources -- Results, Methodology, and Supporting Data," U.S. Geological Survey Digital Data DDS-30 (Gautier and others, 1995). The 1995 Assessment Gas Hydrate thickness boundaries were revised and updated according to recent methane hydrate stability zone studies done in Northern Alaska. In-house well log data/surveys study with geochemical sampling on evidence of thermo gas, resistivity-temperature from Lachenbruch et al and seismic facies were mapped and used as a guide for the gas hydrate stability zone thickness. The original (1995) Gas Hydrate stability data was given as the thickness of the hydrate stability field in meters (200 meters intervals). Contours were regridded using editing surface tools of the ArcMap and applied spline surface analysis tools in order to create contour interval in feet. The zero contour line was separated into individual shapefile and presented here in order to show Gas Hydrates Assessment limits of the North Slope. The offshore extent of the gas-hydrate stability zone is not well established.