hydrocarbons were found between 3150 and 3200 m MD, and nearly
pure hydrocarbons exist between 3310 and 3340 m MD (Fig. 2;
Wiersberg and Erzinger, 2008). Additionally, small tar seeps are
present along the surface trace of the SAF up-dip of the SAFOD
borehole. Oxygen and carbon isotopes within carbonate veins located
throughout the Phase 3 core, including the SDZ and CDZ, also are
consistent with carbonates having precipitated from a fluid charged
with hydrocarbons
3550 m MD. Smaller interstratified lenses rich in CO2 and