Static oil pressure gradient estimation

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Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Formation fluid pressure and its application
Author Edward A. Beaumont, Forrest Fiedler
Link Web page
Store AAPG Store

The static oil pressure gradient is dependent on oil density. Subsurface density of oil or condensate depends on composition, amount of dissolved gases, temperature, and pressure. Oil or condensate density can be estimated to useful accuracy if stock tank API gravity and solution gas-oil ratio (GOR) are known.[1]

Estimating oil pressure gradients[edit]

Follow the steps listed below to estimate static oil pressure gradient.

Step Action
1 Estimate oil density using Figure 5-7 below.
2 Estimate oil pressure gradient using the following formula:

<break> </break> where:

  • Poil grad = oil pressure gradient * ρoil = oil density

Determining oil density[edit]

Use the figure below to determine oil density. If the GOR is unknown or if there is no dissolved gas in the oil, use the 0 line.

Figure 5-7 .

See also[edit]

References[edit]

  1. Schowalter, T., T., 1979, Mechanics of secondary hydrocarbon migration and entrapment: AAPG Bulletin, vol. 63, no. 5, p. 723–760. Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.

External links[edit]

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Static oil pressure gradient estimation
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