Gas Seepage along the Edge of the Aquitaine Shelf (France): Origin and Local Fluxes

Table 1

Molecular and isotopic compositions of the sampled gases of the Aquitaine Shelf seeps.

Sample	CH4% mol	C2H6% mol	C3H8% mol	iC4H10% mol	nC4H10% mol	CO2% mol	‰	‰	‰	‰	δD‰	‰
GZ2-pl535-PZ01-01	99.967	0.000313	0.000067	0.000015	0.000094	0.032	−66.8	−40.9	−29.4	−24	−181	42.8
GZ2-pl535-PZ02-03	99.948	0.000464	0.000056	0.000005	0.000110	0.051	−68.1	−41.9	−28.3	−34	−181	34.1
GZ2-pl535-PZ03-05	99.979	0.000600	0.000102	0.000023	0.000136	0.020	−69.3	−49.1	−30.1	−14	−179	55.3
GZ2-pl536-PZ01-06	99.988	0.000357	0.000051	0.000008	0.000100	0.012	−71.2				−180
GZ2-pl536-PZ02-08	99.985	0.000368	0.000054	0.000005	0.000083	0.015	−72.7	−42.7	−28.3	−24	−182	48.7
GZ2-pl537-PZ01-09	99.985	0.000429	0.000043	0.000004	0.000075	0.014	−68.6				−181
GZ2-pl537-PZ02-11	99.985	0.000423	0.000042	0.000002	0.000089	0.015	−66.1	−45.6	−27.9	−24	−178	42.1
GZ2-pl537-PZ03-13	99.983	0.000435	0.000051	0.000083	0.000105	0.016	−68.8				−182
GZ2-pl537-PZ04-12	99.990	0.000359	0.000042	0.000003	0.000123	0.010	−69.1				−182