TITLE

Quantification of gas hydrate and free gas in the Andaman offshore from downhole data

AUTHOR(S)
Ojha, Maheswar; Sain, Kalachand
PUB. DATE
August 2013
SOURCE
Current Science (00113891);8/25/2013, Vol. 105 Issue 4, p512
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Under Expedition-01 of Indian National Gas Hydrate Programme (NGHP Exp-01), drilling/coring was done in 2006 at one site in the Andaman Sea, where the base of gas hydrate stability, coinciding with the bottom simulating reflector (BSR) on seismic section, was observed at 610 m below sea floor (mbsf) with water depth of 1344 m. We estimate the saturation of gas hydrate and free gas by applying rock physics theories to downhole sonic velocity, and compare the results with the resistivity and chlorinity data. The result matches well with the pressure core data. Although the average saturation of gas hydrate is only 5% of pore volume (or 3% of sediment volume), the total amount of gas in the form of gas hydrate is about 1570.8 cubic metre within the sedimentary column of 308 m above the BSR. The average concentration of free gas is estimated as ~ 1.4% of the pore volume within the sedimentary column of 80 m below the BSR.
ACCESSION #
91862096

 

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