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

Figure 5

Diagrams for the study venting gases at the Aquitaine Shelf of (a) versus ethane to propane molecular composition ratio (modified after Prinzhofer and Deville, 2013) and (b) versus (modified after Prinzhofer and Deville, 2013); (c) diagram of the reciprocal number of carbon atom in methane, ethane, and propane versus their δ¹³C for the study venting gases at the Aquitaine Shelf and other gas samples from the Sea of Marmara (after Chung et al., 1988).

(a)

(b)

(c)