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Line 166: − − [[file:fluid-contacts_fig3.png|thumb|{{figure number|3}}Example of calculating hydrodynamic fluid contacts from pressure data. Pressure elevations are shown by arrows. Calculated fluid contacts are shown by thin lines.]]
→Hydrodynamic gradients
===Hydrodynamic gradients===
===Hydrodynamic gradients===
[[file:fluid-contacts_fig3.png|left|thumb|{{figure number|3}}Example of calculating hydrodynamic fluid contacts from pressure data. Pressure elevations are shown by arrows. Calculated fluid contacts are shown by thin lines.]]
A common type of nonhorizontal oil-water contact is tilting in response to hydrodynamics, the movement of water in the reservoir interval. Hydrodynamic conditions that affect fluid contacts are usually associated with active meteoric aquifers at relatively shallow depths. Indications of active meteoric flow include low salinity water, high topographic relief, and proximity to recharge areas.
A common type of nonhorizontal oil-water contact is tilting in response to hydrodynamics, the movement of water in the reservoir interval. Hydrodynamic conditions that affect fluid contacts are usually associated with active meteoric aquifers at relatively shallow depths. Indications of active meteoric flow include low salinity water, high topographic relief, and proximity to recharge areas.
:<math>h_{\rm B} = 2324/0.433 - 5090 = 277 \mbox{ ft}</math>
:<math>h_{\rm B} = 2324/0.433 - 5090 = 277 \mbox{ ft}</math>
:<math>h_{\rm C} = 2400/0.433 - 5300 = 243 \mbox{ ft}</math>
:<math>h_{\rm C} = 2400/0.433 - 5300 = 243 \mbox{ ft}</math>
and
and