--> Calculated vitrinite reflectance (Ro, %; dashed line) for Jurassic Tuxedni Group source rock in a pseudowell from the upper Cook Inlet, Alaska based on a Petromod® 1D model that used the EASY%Ro method of Sweeney and Burnham (1990).

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Figure 2. Calculated vitrinite reflectance (Ro, %; dashed line) for Jurassic Tuxedni Group source rock in a pseudowell from the upper Cook Inlet, Alaska based on a Petromod® 1D model that used the EASY%Ro method of Sweeney and Burnham (1990). Top of oil and gas windows occurred at 0.6% and 1.2% Ro (solid vertical lines at 82.5 and 22.7 Ma, respectively). Shaded areas define uncertainty of the calibration if one assumes a BHT of 92.4oC ±8oC (198.3 ±14oF). Reservoir rock (Hemlock Conglomerate; stippled) and seal rock (lower portion of Tyonek Formation; horizontal lines) were deposited approximately 32-26 Ma and 26-20 Ma, respectively (Magoon, 1994), thus allowing accumulation of late-generated petroleum from the source rock.