Method of estimating the amount of in situ gas hydrates in deep marine sediments

Lee, M.W.; Hutchinson, Deborah R.; Dillon, William P.; Miller, John J.; Agena, W.F.; Swift, Bree

doi:10.1016/0264-8172(93)90050-3

Cited by 116 publications

(54 citation statements)

References 17 publications

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“…Such studies are helpful for subsurface hydrology and seismic exploration, where the desired products are mostly found in state of multi phase formations. Similar situation arises while studying oil fields under ocean bed, concentrated with gas hydrate (Lee et al 1993;Carcione and Tinivella 2000), and in mapping permafrost rocks in Arctic circles. Moreover, the practical situation of a soft porous rock containing sandstone together with clay contents and saturated with two immiscible fluids, e.g., oil and water constitutes a model matching with the present formulation.…”

Section: Introductionmentioning

confidence: 87%

Body Waves in Composite Solid Matrix Containing Two Immiscible Fluids

2015

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The present paper is concerned with the propagation of plane waves in a porous medium composed of two solids and two immiscible fluids. Using the principal of virtual complementary work, the expression for complementary strain energy density has been derived and the stress-strain relations for isotropic porous medium are obtained. The capillary pressure arising due to the pressure difference at the interface of two fluid phases has been taken into account, and the solid phases are assumed to be weakly coupled. The idea of compressibility tests is used to find values of the coefficients occurring into the stress-strain relations in terms of the physical properties of individual solid and fluid phases. The equations of motion are obtained using Lagrangian approach, and it has been shown that there may exist four compressional and two shear waves in the medium. Phase speeds of these waves are computed numerically and their dependence on frequency has been depicted graphically.

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Section: Introductionmentioning

confidence: 87%

Body Waves in Composite Solid Matrix Containing Two Immiscible Fluids

2015

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“…A typical value for P-waves above the BSR is 2000-2200 m/s, and below the BSR, near to 1300-1500 m/s (Lee et al, 1993;Singh et al, 1993;Wood et al, 1994;Brown et al, 1996;Ecker et al, 1998;Ecker et al, 2000;Pecher et al, 2001). The P-wave velocity value of 1400 m/s is consistent with the presence of free gas, as has been reported by ODP (e.g.…”

Section: Bsr Seismic Character and Physical Parametersmentioning

confidence: 94%

“…Amplitude blanking is very common in several seismic records with BSR (Shipley et al, 1979;Lee et al, 1993). This feature indicates lithologic and hydrate concentration homogeneity (Lee and Dillon, 2001;Lu and McMechan, 2002).…”

Section: Bsr Seismic Character and Physical Parametersmentioning

confidence: 95%

Seismic analysis and distribution of a bottom-simulating reflector (BSR) in the Chilean margin offshore of Valdivia (40° S)

Rodrigo

Vera

González‐Fernández

2009

Journal of South American Earth Sciences

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“…= reprocessed. C. Gas hydrate concentrations from the Lee et al (1993) equation reference. D. Gas hydrate concentrations from the reference with an empirical porosity-velocity function.…”

Section: Post-expedition 311 Outlookmentioning

confidence: 99%

“…The various velocity baselines shown in Figure F8 were calculated from smoothed downhole core porosity data fitted using Athy's law (Athy, 1930). Background profiles based on the smoothed porosity data were calculated using the Lee et al (1993) weighted mean equation, the porosity-velocity relation, and an empirical porosity-velocity relation by Jarrad et al (1995). All these core-based baselines are substantially above the reference profile by Yuan et al, (1996), based on seismic interval velocities, and therefore result in lower gas hydrate concentration estimates of <10% of the pore space.…”

Section: Seismic P-wave Velocitymentioning

confidence: 99%

Gas hydrate on the northern Cascadia margin: regional geophysics and structural framework

Riedel¹,

Willoughby²,

Chen³

et al. 2006

Proceedings of the IODP

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Integrated Ocean Drilling Program Expedition 311 is based on extensive site survey data and historic research at the northern Cascadia margin since 1985. This research includes various regional geophysical surveys using a broad spectrum of seismic techniques, coring and logging by the Ocean Drilling Program Leg 146, heat flow measurements, shallow piston coring, and bottom video observations across a cold-vent field, as well as novel controlled-source electromagnetic and seafloor compliance surveying techniques. The wealth of data available allowed construction of structural cross-sections of the margin, development of models for the formation of gas hydrate in an accretionary prism, and estimation of gas hydrate and free gas concentrations. Expedition 311 established for the first time a transect of drill sites across the northern Cascadia margin to study the evolution of gas hydrate formation over the entire gas hydrate stability field of the accretionary complex. This paper reviews the tectonic framework at the northern Cascadia margin and summarizes the scientific studies that led to the drilling objectives of Expedition 311 Cascadia gas hydrate.

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Method of estimating the amount of in situ gas hydrates in deep marine sediments

Cited by 116 publications

References 17 publications

Body Waves in Composite Solid Matrix Containing Two Immiscible Fluids

Body Waves in Composite Solid Matrix Containing Two Immiscible Fluids

Seismic analysis and distribution of a bottom-simulating reflector (BSR) in the Chilean margin offshore of Valdivia (40° S)

Gas hydrate on the northern Cascadia margin: regional geophysics and structural framework

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