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→Methods for determining fluid contacts
Some reservoirs have irregular or tilted fluid contacts ([[:file:fluid-contacts_fig2.png|Figure 2]]). Reasons for differences in contact elevation in different control wells must first be determined to properly extrapolate nonhorizontal fluid contacts to untested parts of a reservoir. Excluding interpretation or mechanical problems, the most common reasons for tilted fluid contacts are the following:
Some reservoirs have irregular or tilted fluid contacts ([[:file:fluid-contacts_fig2.png|Figure 2]]). Reasons for differences in contact elevation in different control wells must first be determined to properly extrapolate nonhorizontal fluid contacts to untested parts of a reservoir. Excluding interpretation or mechanical problems, the most common reasons for tilted fluid contacts are the following:
* Hydrodynamic gradients
* [[Hydrodynamic gradient]]s
* Reservoir heterogeneity (see [[Geological heterogeneities]])
* Reservoir heterogeneity (see [[Geological heterogeneities]])
* Semipermeable barriers
* Semipermeable barriers