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Tr hu A M Bohrmann G Torres M E and Colwell F S Eds Proceedings of the Ocean Drilling Program Scientific Results Volume 204 27 DATA REPORT NUCLEAR MAGNETIC RESONANCE LOGGING WHILE DRILLING ODP LEG 2041 Timothy S Collett 2 Myung W Lee 2 David S Goldberg 3 Frank R Rack 4 and Trevor Williams3 ABSTRACT Most published gas hydrate volumetric estimates have of necessity been made by broad extrapolation based on only general knowledge of local geologic conditions The amount of gas that might be stored in a gas hydrate accumulation is dependent on a number of reservoir parameters including the areal extent and thickness of the gas hydrate occurrence sediment porosities and the degree of gas hydrate saturation Downhole logs often serve as a source of critical gas hydrate reservoir data Before Ocean Drilling Program ODP Leg 204 however only about seven gas hydrate occurrences had been sampled and surveyed with open hole well logging devices From 16 July through 25 July 2002 a complex logging while drilling LWD and measurement whiledrilling program was conducted on Hydrate Ridge during ODP Leg 204 During the cruise and for the first time during ODP the LWD tool string included Schlumberger s Nuclear Magnetic Resonance While Drilling tool proVision Postcruise research with the proVision data has consisted of estimating bound fluid volumes and total fluid porosities along with comparing nuclear magnetic resonance NMR derived porosities with those derived from downhole measured neutron and density logs and core measurements These efforts have focused on calculating gas hydrate concentrations by indirect methods using NMR data It has been shown that it is possible to obtain gas hydrate saturations percent of pore space occupied by gas hydrate from downhole logging measured NMR porosities In this study porosities derived from the NMR proVision 1 Collett T S Lee M W Goldberg D S Rack F R and Williams T 2006 Data report nuclear magnetic resonance logging while drilling ODP Leg 204 In

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