Difference between revisions of "Hydrocarbon pressure gradient: plotting"
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| Determine the hydrocarbon pressure gradient from one of two ways: | | Determine the hydrocarbon pressure gradient from one of two ways: | ||
− | * Measured hydrocarbon density | + | * Measured hydrocarbon [[density]] |
* Estimates of hydrocarbon density | * Estimates of hydrocarbon density | ||
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| 3 | | 3 | ||
− | | Determine the buoyancy pressure gradient: static water pressure gradient minus hydrocarbon pressure gradient. | + | | Determine the [[buoyancy pressure]] gradient: static water pressure gradient minus hydrocarbon pressure gradient. |
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| 4 | | 4 |
Revision as of 20:43, 3 June 2014
Exploring for Oil and Gas Traps | |
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Series | Treatise in Petroleum Geology |
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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 |
We can estimate the downdip free-water level from a valid fluid pressure measured within a reservoir.
Plotting gradient
The table below outlines the procedure for plotting a hydrocarbon pressure gradient on a hydrostatic pressure plot when a measured pressure is available from the reservoir.
Step | Action |
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1 | Plot measured fluid pressure on a hydrostatic pressure–depth plot. |
2 | Determine the hydrocarbon pressure gradient from one of two ways:
|
3 | Determine the buoyancy pressure gradient: static water pressure gradient minus hydrocarbon pressure gradient. |
4 | Determine a pressure above or below the measured depth point. The table below lists the steps for determining this number.
Example: Measured pressure at depth::7607 ft is pressure::3530 psi and buoyancy pressure gradient is 0.076 psi/ft. What is the hydrocarbon pressure at depth::7507 ft? Solution:
|
5 | Plot the pressure number from step 4 on the pressure–depth plot and draw a line between this point and the measured pressure point. This line is the hydrocarbon pressure gradient. |
See also
- Static hydrocarbon pressure gradients
- Estimating static oil pressure gradients
- Estimating static gas pressure gradients
- Finding free-water level using pressure