Table 3. Results of gas and geochemical analyses of gas hydrate from Site 994.

Hole, core, section, interval (cm):	994C-31X-7, 10-30	994D-4X-1, 5-6
Equilibrium pressure at 21.3 degrees C (psi): 	465	NM
Total volume of gas (cm3): 	617 (STP)	2 (est.)
Gas composition:		
CH4 (%)	98.78	12.69
C2 (ppmv)	86	29
C3 (ppmv)	2	0.3
CO2 (%)	1.22	1.22
Total volume of water (cm3):	4.0	<0.5 (est.)
Volumetric ratio of CH4 to H2O:	154	4-6 (est.)
Composition of water :		NM
Chloride (mM/L)	57.18
Sulfate (mM/L)	1.9
K+ (mM/L)	2.4
Mg2+ (mM/L)	2.9
Ca2+ (mM/L)	2.4

Notes: NM = not measured; STP = standard temperature and pressure; and est. = estimated. For Sample 164-994D-4X-1, 5-6, a very small sample of gas hydrate was placed in a helium evacuated syringe and allowed to dissociate at 21 degrees C. 
The estimated 2 cm3 of evolved gas that was injected onto the gas chromatograph was not sufficient to fill the sample loops and resulted in volumetrically low gas concentrations. 
The balance of the gas was helium added during the measuring process and the gas in the sample loops before sample injection. Gas compositions are normalized to methane.