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Collett, Tim S; Wendlandt, Richard F (2000): Carbon/oxygen ratios, clay composition and gas-hydrate saturation of ODP Leg 164 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804161, Supplement to: Collett, TS; Wendlandt, RF (2000): Formation evaluation of gas hydrate-bearing marine sediments on the Blake Ridge with downhole geochemical log measurements. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-17, https://doi.org/10.2973/odp.proc.sr.164.241.2000

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Published: 2000 (exact date unknown) • DOI registered: 2013-01-10

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Abstract:
The analyses of downhole log data from Ocean Drilling Program (ODP) boreholes on the Blake Ridge at Sites 994, 995, and 997 indicate that the Schlumberger geochemical logging tool (GLT) may yield useful gas hydrate reservoir data. In neutron spectroscopy downhole logging, each element has a characteristic gamma ray that is emitted from a given neutron-element interaction. Specific elements can be identified by their characteristic gamma-ray signature, with the intensity of emission related to the atomic elemental concentration. By combining elemental yields from neutron spectroscopy logs, reservoir parameters including porosities, lithologies, formation fluid salinities, and hydrocarbon saturations (including gas hydrate) can be calculated. Carbon and oxygen elemental data from the GLT was used to determine gas hydrate saturations at all three sites (Sites 994, 995, and 997) drilled on the Blake Ridge during Leg 164. Detailed analyses of the carbon and oxygen content of various sediments and formation fluids were used to construct specialized carbon/oxygen ratio (COR) fan charts for a series of hypothetical gas hydrate accumulations. For more complex geologic systems, a modified version of the standard three-component COR hydrocarbon saturation equation was developed and used to calculate gas hydrate saturations on the Blake Ridge. The COR-calculated gas hydrate saturations (ranging from about 2% to 14% bulk volume gas hydrate) from the Blake Ridge compare favorably to the gas hydrate saturations derived from electrical resistivity log measurements.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.823549 * Median Longitude: -75.495004 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545900 * North-bound Latitude: 31.843300 * East-bound Longitude: -75.468500
Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-12-17T07:25:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Collett, TS; Wendlandt, RF (2000): (Table 4) Relative amount of illite and smectite in mixed-layer clays from ODP Hole 164-997A. https://doi.org/10.1594/PANGAEA.804158
  2. Collett, TS; Wendlandt, RF (2000): (Table 3) Carbon/oxygen elemental ratios in ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.804157
  3. Collett, TS; Wendlandt, RF (2000): (Table 6) Carbon and oxygen content and gas-hydrate saturation of ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.804159