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UNDERSTANDING
SUBSURFACE PRESSURE
AND
ITS PREDICTION
Abdullah Dubaisi
03
\
08
\
2013
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Headlines
Introduction
Types of formation pressure
Stress in the subsurface
Manage Reservoir
Seismic Data
Study Area in Abu Dhabi
Data well
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Introduction
Pressure measurement is essential to optimized hydrocarbon
recovery Accurate formation pressure can be determined at almost
any time in
cycle.
Drilling Data and seismic Data give us optimizing well location
predi
Pore Pressure gradients are variable depending on subsurface
temperapressure conditions
The transition zone is an interval which exhibits a gradual
change in ppressure from hydrostatic to abnormal, or from abnormal
to even a hipressure
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Types of Pressure formation
Subnormal pressure: Pressure below hydrostatic, Areas where
water (arid and mountainous areas)
Normal pressure: (Pore pressure = Hydrostatic pressure)
Hydrostaticthe pressure exerted by the weight of a static column of
fluid
Abnormal pressure: Overpressure always involve a particular zone
bsealed.
Pore pressure
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Lithostatic pressure(ovepressure exerted by the weig
sediments, including the weigfluids.
Lithostatic pressure
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Types of formation pressure
Water
Table
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Causes of Abnormal pressure
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Stress in the subsurface
Natural, the vertical sprimarily from the weioverburden.
Horizontaalso have a gravitatiocomponent that manenhanced by
tectoneffects and geologic
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Stress in the subsurface
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Manage Reservoir
In formation pore spaces, strliquids or gases in the form
omagnitude of pressure appldirection is the same for all dIf a
fluid is compressed, it reaequal and opposite pressureCap-rock
zone.
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Manage Reservoir
Structural situations ihighly dipping permformationsAllow
pressure transmfrom a higher- pressu
zone to a shallower d
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Seismic Data
More information including, Drdata, mudlogging, formation samand
while-drilling logs.
Reflection tomography offers siadvantages compared with convdata
but reflection tomography resolution, conventional velocity
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Seismic data & Drilling Data
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Study Abu Dhabi Area
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Study Abu Dhabi Area
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Real Well Data in KSA
Operator: SAUDI ARAM Well: X1
Location: xxx
Country: SAUDI ARABIA
Elevation GL: 730.00 FT
KB:35.00 FT
Drilling Rig: X2
Vertical well
TD @ 16373 FT
Gas Reservoir @ Khuff
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Well Data PressureWater Table
Note
Pore pressure estimation
Lithology
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Well Data Weight
Transitionzone
TZ
TZ
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Summary
Formation pressure Data give us :
1. Water salinities
2. Fluid contact
3. Transition zone
4. Well design
5. Determine good reservoir to production
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Thank you
