Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Riedel, Michael; Long, Philip E; Collett, Tim S (2006): (Table 1) Results of core-NCR (Non-Contact Resistivity) data analyses from ODP Leg 204. PANGAEA, https://doi.org/10.1594/PANGAEA.726488, Supplement to: Riedel, M et al. (2006): Estimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration. Marine Geology, 227(3-4), 215-225, https://doi.org/10.1016/j.margeo.2005.10.007

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
As part of Ocean Drilling Program Leg 204 at southern Hydrate Ridge off Oregon we have monitored changes in sediment electrical resistivity during controlled gas hydrate dissociation experiments. Two cores were used, each filled with gas hydrate bearing sediments(predominantly mud/silty mud). One core was from Site 1249 (1249F-9H3), 42.1 m below seafloor (mbsf) and the other from Site 1248 (1248C-4X1), 28.8 mbsf. At Site 1247, a third experiment was conducted on a core without gas hydrate (1247B-2H1, 3.6 mbsf). First, the cores were imaged using an infra-red (IR) camera upon recovery to map the gas hydrate occurrence through dissociation cooling. Over a period of several hours, successive runs on the multi-sensor track (includes sensors for P-wave velocity, resistivity, magnetic susceptibility and gamma-ray density) were carried out complemented by X-ray imaging on core 1249F-9H3. After complete equilibration to room temperature (17-18 8C) and complete gas hydrate dissociation, the final measurement of electrical resistivity was used to calculate pore-water resistivity and salinities. The calculated pore-water freshening after dissociation is equivalent to a gas hydrate concentration in situ of 35-70% along core 1249F-9H3 and 20-35% for core 1248C-4X1 assuming seawater salinity of in situ pore fluid. Detailed analysis of the IR scan, X-ray images and split-core photographs showed the hydrate mainly occurred disseminated throughout the core. Additionally, in core 1249F-9H3, a single hydrate filled vein, approximately 10 cm long and dipping at about 658, was identified. Analyses of the logging-while-drilling (LWD) resistivity data revealed a structural dip of 40-808 in the interval between 40 and 44 mbsf. We further analyzed all resistivity data measured on the recovered core during Leg 204. Generally poor data quality due to gas cracks allowed analyses to be carried out only at selected intervals at Sites 1244, 1245, 1246, 1247, 1248, 1249, and 1252. With a few exceptions, data from these intervals yield low to no gas hydrate concentration, which corresponds to estimates from downhole resistivity logs. However, since the gas cracking may be the result of gas hydrate dissociation, this is a biased sampling. Cores that had contained some gas hydrate may have been excluded.
Project(s):
Coverage:
Median Latitude: 44.580963 * Median Longitude: -125.135414 * South-bound Latitude: 44.570530 * West-bound Longitude: -125.152500 * North-bound Latitude: 44.586180 * East-bound Longitude: -125.092810
Date/Time Start: 2002-08-01T13:45:00 * Date/Time End: 2002-09-01T00:00:00
Minimum DEPTH, sediment/rock: 4.35 m * Maximum DEPTH, sediment/rock: 147.35 m
Event(s):
204-1244E  * Latitude: 44.586180 * Longitude: -125.119530 * Date/Time Start: 2002-08-18T23:00:00 * Date/Time End: 2002-08-22T01:45:00 * Elevation: -893.3 m * Penetration: 250 m * Recovery: 137.73 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 135.8 m cored; 114.2 m drilled; 101.4 % recovery
204-1245B  * Latitude: 44.585980 * Longitude: -125.149100 * Date/Time Start: 2002-08-06T07:15:00 * Date/Time End: 2002-08-09T15:45:00 * Elevation: -869.7 m * Penetration: 473.7 m * Recovery: 418.02 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 471.7 m cored; 2 m drilled; 88.6 % recovery
204-1246B  * Latitude: 44.586060 * Longitude: -125.135380 * Date/Time Start: 2002-08-11T04:00:00 * Date/Time End: 2002-08-11T22:45:00 * Elevation: -849.4 m * Penetration: 136.7 m * Recovery: 135.38 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 136.7 m cored; 0 m drilled; 99 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEvent
Sample code/labelSample labelRiedel, MichaelDSDP/ODP/IODP sample designation
Sample code/label 2Sample label 2Riedel, MichaelDSDP/ODP/IODP sample designation
DEPTH, sediment/rockDepth sedmGeocode
Depth, top/minDepth topmRiedel, Michael
Depth, bottom/maxDepth botmRiedel, Michael
HydrateHydrate%Riedel, Michaelaverage hydrate, minimum
HydrateHydrate%Riedel, Michaelaverage hydrate, maximum
CommentCommentRiedel, Michael
Size:
172 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Sample label

Sample label 2

Depth sed [m]

Depth top [m]

Depth bot [m]

Hydrate [%]
(average hydrate, minimum)

Hydrate [%]
(average hydrate, maximum)

Comment
204-1244E 204-1244E-14H-6101.20100.70101.70010
204-1244E204-1244E-18H-3125.30124.80125.8000
204-1245B 204-1245B-5H-2204-1245B-5H-345.0043.5046.5000
204-1245B204-1245B-10H-287.5687.0088.1305
204-1245B204-1245B-11H-251.7096.007.4000
204-1245B204-1245B-12H-5204-1245B-12H-7112.25111.00113.50015
204-1245B204-1245B-15X-1204-1245B-15X-3130.00128.00132.0000
204-1246B 204-1246B-2H-116.0014.0018.0000
204-1247B 204-1247B-6H-1204-1247B-6H-240.7838.9542.6005
204-1247B204-1247B-8H-458.5557.8059.3005
204-1247B204-1247B-9H-4204-1247B-9H-568.1066.6069.6000
204-1247B204-1247B-10H-375.6075.2076.0000
204-1247B204-1247B-10H-477.2076.7077.7005
204-1247B204-1247B-11H-486.1085.3086.9005
204-1247B204-1247B-12H-697.6096.6098.6000
204-1247B204-1247B-14H-1204-1247B-15X-4112.55106.80118.3000
204-1247B204-1247B-2H-14.353.605.1000Monitoring experiment cores
204-1248C 204-1248C-3X-320.0018.0022.00010
204-1248C204-1248C-8H-1204-1248C-8H-268.5067.0070.0000
204-1248C204-1248C-9H-583.0082.0084.0000
204-1248C204-1248C-11H-398.0097.0099.0005
204-1248C204-1248C-12H-1105.40105.00105.8000
204-1248C204-1248C-13H-3118.25117.80118.7000
204-1248C204-1248C-4X-129.0328.8029.262035Monitoring experiment cores
204-1249F 204-1249F-10H-351.2050.4052.007070
204-1249F204-1249F-15H-1204-1249F-15H-374.0073.0075.005555
204-1249F204-1249F-9H-342.9642.2143.713075Monitoring experiment cores
204-1252A 204-1252A-10H-586.5085.7087.3000
204-1252A204-1252A-11H-394.2293.8594.6000
204-1252A204-1252A-14H-3123.10122.50123.7000
204-1252A204-1252A-16X-2136.90136.40137.4000
204-1252A204-1252A-17X-2204-1252A-17X-3147.35146.00148.7000