History and significance of gas sampling during DSDP and ODP drilling associated with gas hydrates

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doi: 10.1029/GM124p0053
Author(s): Paull, Charles K.; Ussler, William, III
Author Affiliation(s): Primary:
Monterey Bay Aquarium Research Institute, Research and Development Division, Moss Landing, CA, United States
Other:
U. S. Geological Survey, United States
Volume Title: Natural gas hydrates; occurrence, distribution, and detection
Volume Author(s): Paull, Charles K., editor; Dillon, William P.
Source: Natural gas hydrates; occurrence, distribution, and detection, edited by Charles K. Paull and William P. Dillon. Geophysical Monograph, Vol.124, p.53-65. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0065-8448. ISBN: 0-87590-982-5 CODEN: GPMGAD
Note: In English. 51 refs.; illus.
Summary: Gas hydrate formation requires adequate concentrations of gas (usually methane) to be present in the sediments. Thus, methane-bearing gas hydrate occurrence is closely coupled with the distribution of methane in marine sediments. We review the history of gas sampling from bore holes in gas-rich continental margin sediment sequences that may be associated with gas hydrate. Gas measurements have been routinely made for both drilling safety and scientific investigations during the Deep Sea Drilling Project (DSDP) and the Ocean Drilling Program (ODP). Until recently, gas samples have come only from core voids and residual gas extracted from the cored sediments. However, recent successes with down-hole tools designed to maintain cores at their original pressure during core recovery have obtained independent data on in situ gas amounts, gas composition, and the process of core degassing. These data show that the residual core gas concentration represents only a tiny fraction of the total in situ gas inventory. Because the majority of the original gas escapes from the core during core recovery, caution must be used when trying to apply traditional core gas measurements to potentially gas hydrate-bearing sediment sequences.
Year of Publication: 2000
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 29 Economic Geology, Energy Sources; Aliphatic hydrocarbons; Alkanes; Cores; Deep Sea Drilling Project; Downhole methods; Gas hydrates; Hydrocarbons; In situ; Instruments; Marine sediments; Methane; Natural gas; Ocean Drilling Program; Organic compounds; Petroleum; Sampling; Sediments
Record ID: 2001071702
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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