Fig. 13
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Gamma Ray (GR), Sonic (DT), Density (RHOZ) and Neutron (NPHI) logs for the wells PTRA-1 and PTRA-13, focusing on layers with amounts of H2 higher than methane (H2/CH4 > 1). The main lithology description was assumed based on sidewall and core samples. *Dark pink zones present high neutron and low density, then interpreted as H2 zones.
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