Direct measurement of in situ methane quantities in a large gas-hydrate reservoir

  title={Direct measurement of in situ methane quantities in a large gas-hydrate reservoir},
  author={Gerald R. Dickens and Charles K Paull and Paul J. Wallace},
Certain gases can combine with water to form solids—gas hydrates—that are stable at high pressures and low temperatures1,2. Conditions appropriate for gas-hydrate formation exist in many marine sediments where there is a supply of methane. Seismic reflection profiles across continental margins indicate the frequent occurrence of gas hydrate within the upper few hundred metres of sea-floor sediments, overlying deeper zones containing bubbles of free gas3–9. If large volumes of methane are stored… 
Escape of methane gas through sediment waves in a large methane hydrate province
Despite paleoceanographic evidence that large quantities of methane have escaped from marine gas hydrates into the oceans, the sites and mechanisms of methane release remain largely speculative. New
Gas hydrates: past and future geohazard?
The destabilization of gas hydrate reserves in permafrost areas is more certain as climate models predict that high-latitude regions will be disproportionately affected by global warming with temperature increases of over 12°C predicted for much of North America and Northern Asia.
The Global Occurrence of Natural Gas Hydrate
Natural gas hydrate occurs worldwide in oceanic sediment of continental and insular slopes and rises of active and passive margins, in deep-water sediment of inland lakes and seas, and in polar
Energy resource potential of natural gas hydrates
The discovery of large gas hydrate accumulations in terrestrial per mafrost regions of the Arctic and beneath the sea along the outer continental margins of the world's oceans has heightened interest
In situ methane concentrations at Hydrate Ridge, offshore Oregon: New constraints on the global gas hydrate inventory from an active margin
The widespread presence of bottom-simulating reflectors (BSRs) on continental margins has bolstered suggestions that gas hydrates and free gas constitute a large dynamic reservoir of CH4 carbon and a


Is the extent of glaciation limited by marine gas-hydrates
Methane may have been released to the atmosphere during the Quaternary from Arctic shelf gas-hydrates as a result of thermal decomposition caused by climatic warming and rising sea-level; this
Potential distribution of methane hydrates in the world's oceans
Estimates of the magnitudes and spatial distribution of potential oceanic methane hydrate reservoirs have been made from pressure-temperature phase relations and a plausible range of thermal
Natural Gases in Marine Sediments
  • I. Kaplan
  • Geology, Environmental Science
    Marine Science
  • 1974
Pathways and Environmental Requirements for Biogenic Gas Production in the Ocean.- Depth Distributions of Gases in Shallow Water Sediments.- Methane and Carbon Dioxide in Coastal Marsh Sediments.-
Dissociation of oceanic methane hydrate as a cause of the carbon isotope excursion at the end of the Paleocene
Isotopic records across the “Latest Paleocene Thermal Maximum“ (LPTM) indicate that bottom water temperature increased by more than 4°C during a brief time interval (<104 years) of the latest
Methane Hydrate and Free Gas on the Blake Ridge from Vertical Seismic Profiling
Seismic velocities measured in three drill holes through a gas hydrate deposit on the Blake Ridge, offshore South Carolina, indicate that substantial free gas exists to at least 250 meters beneath
Effect of hydrostatic pressure and salinity on the stability of gas hydrates
The distribution of gas in the hydrate and the liquid phases for the two-phase systems methane hydrate-water and methane hydrate-seawater has been calculated as a function of hydrostatic pressure. It
Velocity Structure of a Gas Hydrate Reflector
Waveform inversion of seismic reflection data can be used to estimate from seismic data worldwide the velocity structure of a BSR and its thickness, and predicts that sediment pores beneath the BSR contain free methane for approximately 30 meters.
A seismic study of methane hydrate marine bottom simulating reflectors
Multichannel seismic reflection data have been analyzed from an area of clear bottom simulating reflectors (BSRs) on the northern Cascadia subduction zone margin off Vancouver Island. The reflector