Integrated analysis of well logs and seismic data to estimate gas hydrate concentrations at Keathley Canyon, Gulf of Mexico

Lee, M.W.; Collett, Timothy S.

doi:10.1016/j.marpetgeo.2007.09.002

Cited by 65 publications

(45 citation statements)

References 21 publications

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“…Lee and Collett (2008) infer a very small reduction in water saturations at the BSR and therefore low saturations of gas hydrate and free gas, an interpretation that is consistent with the BSR appearing as a very weak reflection at the drill hole on line KC03.…”

Section: Correlation Between Seismic Stratigraphy and Drilling Resultssupporting

confidence: 62%

“…Interpretations of the JIP drilling data used in this paper are based on the gamma-ray and ring resistivity logs (from the GeoVision tool) collected in the LWD program in KC 151-2 as described in Claypool (2006) and Cook and Goldberg (2006). Synthetic seismograms constructed from the logging data are in good agreement with seismic reflection data at the drill hole (Lee and Collett, 2008).…”

Section: Datasupporting

confidence: 52%

“…This zone of elevated resistivity correlates with parts of units e and f. A slight resistivity anomaly may characterize the depth of the BSR at 392 mbsf (Lee and Collett, 2008). Lee and Collett (2008) infer a very small reduction in water saturations at the BSR and therefore low saturations of gas hydrate and free gas, an interpretation that is consistent with the BSR appearing as a very weak reflection at the drill hole on line KC03.…”

Section: Correlation Between Seismic Stratigraphy and Drilling Resultsmentioning

confidence: 59%

“…In a detailed analysis of LWD data, Lee and Collett (2008) have shown that the general pattern of reflections observed in the 3D seismic data can be reproduced with synthetic seismograms generated from the well logs. In this section, information in the well logs is correlated with the seismic stratigraphy interpreted from the 2D seismic data in the Casey basin.…”

Section: Correlation Between Seismic Stratigraphy and Drilling Resultsmentioning

confidence: 99%

“…This corresponds to portions of units e and f in the seismic stratigraphy, units that are interpreted as fine-grained muds and clays based on gamma-ray logging data. Using the resistivity measurements and the Archie relation to quantify the amount of gas hydrate, Lee and Collett (2008) estimated that the top of this interval from 220-230 mbsf contained significant gas hydrate, with several thin peaks up to 40% saturation of the pore space. In the rest of the gas hydrate-bearing section, variability was large, and estimates of less than 10% saturation were common.…”

Section: Occurrence Of Gas Hydratementioning

confidence: 99%

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Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico

Hutchinson

Hart

Collett

et al. 2008

Marine and Petroleum Geology

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a b s t r a c tThe Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an intraslope minibasin (Casey basin) in the northern Gulf of Mexico at 1335 m water depth. Around the drill sites, a grid of 2D high-resolution multichannel seismic data designed to image depths down to at least 1000 m sub-bottom reveals 7 unconformities and disconformities that, with the seafloor, bound 7 identifiable seismic stratigraphic units. A major disconformity in the middle of the units stands out for its angular baselapping geometry. From these data, three episodes of sedimentary deposition and deformation are inferred. The oldest episode consists of fine-grained muds deposited during a period of relative stability in the basin (units e, f, and g). Both the BSR and inferred gas hydrate occur within these older units. The gas hydrate occurs in near-vertical fractures. A second episode (units c and d) involved large vertical displacements associated with infilling and ponding of sediment. This second interval corresponds to deposition of intercalated fine and coarse-grained material that was recovered in the drill hole that penetrated the thin edges of the regionally much thicker units. The final episode of deposition (units a and b) occurred during more subdued vertical motions. Hemipelagic drape (unit a) characterizes the modern seafloor. The present-day Casey basin is mostly filled. Its sill is part of a subsiding graben structure that is only 10-20 m shallower than the deepest point in the basin, indicating that gravity-driven transport would mostly bypass the basin. Contemporary faulting along the basin margins has selectively reactivated an older group of faults. The intercalated sand and mud deposits of units c and d are tentatively correlated with Late Pleistocene deposition derived from the western shelf-edge delta/depocenter of the Mississippi River, which was probably most active from 320 ka to 70 ka [Winker, C.D., Booth, J., 2000. Sedimentary dynamics of the salt-dominated continental slope, Gulf of Mexico: integration of observations from the seafloor, near-surface, and deep subsurface. In: Proceedings of the GCSSEPM Foundation 20th Annual Research Conference, Deep-water Reservoirs of the World, pp. 1059-1086]. The presence of sand within the gas hydrate stability zone (in units c and d) is not sufficient to concentrate gas hydrate even though dispersed gas hydrate occurs deeper in the fractured mud/clay-rich sections of units e and f.Published by Elsevier Ltd.

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Section: Correlation Between Seismic Stratigraphy and Drilling Resultssupporting

confidence: 62%

Section: Datasupporting

confidence: 52%

Section: Correlation Between Seismic Stratigraphy and Drilling Resultsmentioning

confidence: 59%

Section: Correlation Between Seismic Stratigraphy and Drilling Resultsmentioning

confidence: 99%

Section: Occurrence Of Gas Hydratementioning

confidence: 99%

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Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico

Hutchinson

Hart

Collett

et al. 2008

Marine and Petroleum Geology

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Imaging methane hydrates growth dynamics in porous media using synchrotron X‐ray computed microtomography

Kerkar

Horvat

Jones

et al. 2014

Geochem Geophys Geosyst

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Commercial-scale methane (CH 4 ) extraction from natural hydrate deposits remains a challenge due to, among other factors, a poor understanding of hydrate-host sediment interactions under low-temperature and high-pressure conditions that are conducive to their existence. We report the use of synchrotron X-ray computed microtomography (CMT) to image, for the first time, time-resolved pore-scale methane CH 4 hydrate growth from an aqueous solution containing 5 wt % barium chloride (BaCl 2 ) and pressurized CH 4 hosted in glass beads, all contained in an aluminum cell with an effective volume of 3.5 mL. Multiple two-dimensional (2-D) cross-sectional images show CH 4 hydrates, with 7.5 mm resolution, distributed in patches throughout the system without dependence on distance from the cell walls. The time-resolved three-dimensional (3-D) images, constructed from the 2-D slices, exhibited pore-filling hydrate formation from dissolved CH 4 gas, similar to natural CH 4 hydrates (sI) in the marine environment. Furthermore, the 3-D images show that the aqueous phase was the wetting phase of the glass beads, i.e., the host and the formed hydrate were separated by an aqueous layer. These results provide some fundamental understanding of the nucleation phenomenon of gas hydrate formation at the pore scale. Pore-filling CH 4 hydrate growth is likely to result in a reduced bulk modulus, and thus, could affect seafloor stability during the reverse phenomenon, i.e., dissociation of natural hydrate deposits.

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Estimating the amount of gas-hydrate using effective medium theory: a case study in the Blake Ridge

2010

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Integrated analysis of well logs and seismic data to estimate gas hydrate concentrations at Keathley Canyon, Gulf of Mexico

Cited by 65 publications

References 21 publications

Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico

Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico

Imaging methane hydrates growth dynamics in porous media using synchrotron X‐ray computed microtomography

Estimating the amount of gas-hydrate using effective medium theory: a case study in the Blake Ridge

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