Natural gas hydrates in the Alaskan Arctic
The occurrence of in-situ natural gas hydrates in the arctic North Slope of Alaska is governed by several thermodynamic and geologic parameters, such as mean annual surface temperature, geothermal gradients above and below the base of the permafrost, pore-fluid salinity, permafrost base depth and temperature, subsurface pressure, and composition. Accurate knowledge of these parameters is necessary to determine the depths and thicknesses of zones of potential hydrate occurences. The role of the parameters is discussed in this paper. To determine the hydrate-stability zone, a nomogram has been developed and has been used for several Alaskan wells. For further delineation of gas hydrates, the neutron-transit-time crossplots have served as a valuable tool. To quantify gas hydrate deposits in terms of thickness, porosity, and saturation; use of neutron- and sonic-porosity-correction factors and Pickett crossplots is recommended.
- Research Organization:
- Univ. of Alaska (US)
- OSTI ID:
- 7244189
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Vol. 3:1
- Country of Publication:
- United States
- Language:
- English
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02 PETROLEUM
EXPLORATORY WELLS
NEUTRON LOGGING
NATURAL GAS HYDRATE DEPOSITS
GEOLOGY
THERMODYNAMICS
ALASKA
EXPLORATION
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GEOPHYSICS
PERMAFROST
RESERVOIR FLUIDS
RESERVOIR PRESSURE
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FEDERAL REGION X
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030200* - Natural Gas- Reserves
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