Collett, Tim S; Ladd, John W (2000): Volume of natural gas within gas-hydrate and free-gas occurrences in ODP Leg 164 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804065, Supplement to: Collett, TS; Ladd, JW (2000): Detection of gas hydrate with downhole logs and assessment of gas hydrate concentrations (saturations) and gas volumes on the Blake Ridge with electrical resistivity log data. 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, 1-13, https://doi.org/10.2973/odp.proc.sr.164.219.2000
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Abstract:
Leg 164 of the Ocean Drilling Program was designed to investigate the occurrence of gas hydrate in the sedimentary section beneath the Blake Ridge on the southeastern continental margin of North America. Sites 994, 995, and 997 were drilled on the Blake Ridge to refine our understanding of the in situ characteristics of natural gas hydrate. Because gas hydrate is unstable at surface pressure and temperature conditions, a major emphasis was placed on the downhole logging program to determine the in situ physical properties of the gas hydrate-bearing sediments. Downhole logging tool strings deployed on Leg 164 included the Schlumberger quad-combination tool (NGT, LSS/SDT, DIT, CNT-G, HLDT), the Formation MicroScanner (FMS), and the Geochemical Combination Tool (GST).
Electrical resistivity (DIT) and acoustic transit-time (LSS/SDT) downhole logs from Sites 994, 995, and 997 indicate the presence of gas hydrate in the depth interval between 185 and 450 mbsf on the Blake Ridge. Electrical resistivity log calculations suggest that the gas hydrate-bearing sedimentary section on the Blake Ridge may contain between 2 and 11 percent bulk volume (vol%) gas hydrate. We have determined that the log-inferred gas hydrates and underlying free-gas accumulations on the Blake Ridge may contain as much as 57 trillion m**3 of gas.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.813723 * Median Longitude: -75.508194 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545817 * North-bound Latitude: 31.843200 * East-bound Longitude: -75.468550
Date/Time Start: 1995-11-07T00:00:00 * Date/Time End: 1995-12-17T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Collett, TS; Ladd, JW (2000): (Table 5) Volume of natural gas within the downhole log-inferred free-gas occurrences in ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.804064
- Collett, TS; Ladd, JW (2000): (Table 4) Volume of natural gas within the downhole log-inferred gas-hydrate occurrences in ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.804059