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MWD/LWD and Well Logging Data for Geomechanical Model Building

11. FKPE Workshop- Bohrlochgeophysik und Gesteinsphysik in Hannover am 06.-07.10.2011Michael J. Blum senior petrophysicist

OMV E&P PE-Formation Evaluation

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Objectives

� The Geomechanical Model� Building a Geomechanical Model : Generic Workflow

� Using Core information� Formation Strength Evaluation� Overburden Gradient Calculation� Pore Pressure Prediction� Stress Orientation� Maximum Horizontal Stress Magnitude

� Conclusions

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The Geomechanical Model

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Building a Geomechanical Model (GEM): Generic Workflow

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Using Core tests

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Using Core Photos and LWD images

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Formation strength evaluation : Pros and Cons

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Dynamic Elastic Constants

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Calculation of Overburden Gradient

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Pore pressure prediction: Normal compaction trends

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Pore pressure prediction: Wireline/MWD response to overpressure

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Pore Pressure Prediction : Example

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Stress Orientation: Near Wellbore Stresses

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Maximum Horizontal Stress Magnitude : Input data instead of image log

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Maximum Horizontal Stress Magnitude : Sonic Scanner

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Conclusions

� Petrophysical logs are valuable for geomechanical modeling� Logs are required for evaluation of formation strength, pore

pressure,stress direction, and maximum horizontal stress magnitude� Most important LWD or Wireline Logs for Geomechanics include GR,

density, sonic, resistivity, caliper and borehole image logs, withoutthem it is not possible to establish a reasonable Geomechanicalmodel

� High quality log data results are essential for a high accuracygeomechanical model