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AAPG Bulletin

Figure

AAPG Bulletin; Year: 2021; Issue: August
DOI: 10.1306/02262118214

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Figure 16. Water saturation $\left(S_w\right)$ curves from a Cypress Sandstone interval. Logged interval from the John O. Coen 120 well (API 121592608300, Section 4, T3N, R9E). Well produced from the Cypress. ${\overline{\varphi }}_m$ = average clay mineral microporosity; OWC = oil–water contact; ROZ = residual oil zone; $S_w$ Archie = water saturation from the Archie equation (Archie, 1942); $S_w$ Dual Water $(V_e)$ = water saturation with a clay mineral volume input of 4%; $S_w$ Dual Water $(V_e$ illite ${\overline{\varphi }}_m$ = 95%) = water saturation with a clay mineral volume input of 8%; $S_w$ Dual Water $\left(V_{sh}\right)$ = water saturation with the clay mineral content estimated from gamma-ray logs; V_e = effective clay mineral volume; $V_{sh}$ = volume of shale.

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