Journal
MARINE AND PETROLEUM GEOLOGY
Volume 108, Issue -, Pages 368-376Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2018.12.049
Keywords
Gas hydrate; Chloride; Temperature; Fluid advection
Categories
Funding
- JAMSTEC
Ask authors/readers for more resources
We estimate the rate of upward pore fluid flow and chlorinity (Cl-) concentrations at depth through a joint analysis of Cl- concentration and temperature versus depth profiles obtained from gas hydrate related test sites drilled and cored in the Krishna-Godavari Basin off the eastern coast of India. Cl-, measured on conventional core samples, decreases with depth at all sites but some of the Cl(- )profiles show a prominent convex shape, whereas in situ temperature profiles, obtained by the Advanced Piston Coring Temperature probe, are mostly linear at all sites established during the National Gas Hydrate Program 02 Expedition (NGHP-02). Assuming a one-dimensional, time-dependent model for the advection of pore fluid including the sedimentation effect and depth-dependent diffusivity, we estimate darcy velocity and the Cl- concentrations at depth. The best-fit darcy velocity of 1.2-1.6 x 10(-11) m/s was estimated for the sites along the crest of the regional anticlinal structure in the NGHP-02 Area B, which was significantly faster than those on the flanks of the anticline. Because the thermal diffusion coefficient is much larger than the chloride ion diffusion coefficient, estimated darcy velocities are not great enough to generate nonlinear temperature profiles with depth, which is consistent with observed linear thermal profiles.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available