Petroleum Pore Pressure Prediction Calculator
Named Eaton SONIC normal/observed transit-time convention with explicit exponent (3 example), independently established overburden/hydrostatic pressures; not resistivity exponent, proven pore pressure or drilling safety. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
The Eaton sonic relation estimates a pressure term from observed and normal sonic transit times under a supplied exponent.
The Eaton sonic relation estimates a pressure term from observed and normal sonic transit times under a supplied exponent.1
This calculator uses that particular ratio convention and independent reference pressures rather than certifying pore pressure.
When to use Petroleum Pore Pressure Prediction Calculator
Use this tool when you need to calculate the stated measurement summary or conditional model from matched observations. Prepare completed matched measurements, SI or explicitly stated oilfield units, and independent evidence for the selected branch or calibration.
How to use Petroleum Pore Pressure Prediction Calculator and understand its results
- Prepare completed matched measurements, SI or explicitly stated oilfield units, and independent evidence for the selected branch or calibration.
- Enter callerIndependentlyEstablishedOverburdenPa, callerHydrostaticReferencePa, observedSonicTransitUsFoot, callerMatchedNormalSonicTransitUsFoot, callerEatonSonicExponent, following the field table and calculation rules below, then run the tool.
- Read eatonSonicModeledPorePressurePa. For result objects, inspect the nested output fields below, including any missing evidence or selected indices.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerIndependentlyEstablishedOverburdenPa | Caller independently established overburden pa; pressure or stress in pascals, with the sign convention described above. | number | Required |
| callerHydrostaticReferencePa | Caller hydrostatic reference pa; pressure or stress in pascals, with the sign convention described above. | number | Required |
| observedSonicTransitUsFoot | Observed sonic transit us foot | number | Required |
| callerMatchedNormalSonicTransitUsFoot | Caller matched normal sonic transit us foot | number | Required |
| callerEatonSonicExponent | Caller eaton sonic exponent | number | Required |
Require positive observed and normal transit times in μs/ft and positive exponent. Require nonnegative hydrostatic and overburden pressures with hydrostatic≤overburden. Compute overburden minus their difference times (normal/observed)^exponent. Signed modeled pressures are not clamped to a physical interval.
Pp=Sv−(Sv−Ph)(normalTransit/observedTransit)^exponent Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| eatonSonicModeledPorePressurePa | Eaton sonic modeled pore pressure pa; pressure or stress in pascals, with the sign convention described above. | number |
{
"input": {
"callerIndependentlyEstablishedOverburdenPa": 100,
"callerHydrostaticReferencePa": 20,
"observedSonicTransitUsFoot": 2,
"callerMatchedNormalSonicTransitUsFoot": 1,
"callerEatonSonicExponent": 3
},
"output": {
"eatonSonicModeledPorePressurePa": 90
}
}Limitations and assumptions
Measurements, unit conventions, branch identity, and model applicability must be independently established. The result does not infer a complete reservoir or flow model, operational settings, or a reserve classification.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected.
Alternative or Complementary methods
For a related task, use Petroleum Overburden Pressure Calculator: Vertical overburden stress integrates bulk density over depth and includes the stress already present at the top of the recorded interval. This calculator uses a depth-dependent density profile and explicit gravity rather than a single assumed density. For a complementary step, use Petroleum Fracture Pressure Calculator: A fracture indicator recorded during a completed pressure test can cross an independently chosen criterion more than once. This tool reports all crossings of supplied measurements without establishing a safe pressure or prescribing a test.
References
Similar or alternative tools
- Petroleum Overburden Pressure Calculator
Vertical overburden stress integrates bulk density over depth and includes the stress already present at the top of the recorded interval. This calculator uses a depth-dependent density profile and explicit gravity rather than a single assumed density.
- Petroleum Fracture Pressure Calculator
A fracture indicator recorded during a completed pressure test can cross an independently chosen criterion more than once. This tool reports all crossings of supplied measurements without establishing a safe pressure or prescribing a test.