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8/20/2019 Why Geomechanical Reservoir Kpi
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www.elnusa.co.id
WHY GEOMECHANICAL
RESERVOIR ?
PORE PRESSURE & STRESS STATE RELATIONSHIP
Dr. Ir. Imam Setiaji Ronoatmojo, MT
KOMUNITAS PETROPHYCIST INDONESIA JAKARTA, 3 FEBRUARY 2016
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AGENDA
• Introduction
• Pore Pressure at Depth
•
Rock Strength• Stress Around Vertical Wells
• The Tectonic Stress Field
• Application
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INTRODUCTION
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4Basic Seismic Training : Data Processing
EXPLORATION SEISMOLOGY : Petroleum System and Basic Principles of Wave
Propagation
HYDROCARBONOCCURENCE
Source rocks
Overburden rocks
Reservoir rocks & carried beds
Sealing rocks
Traps
Kitchen Petroleum migration
Preservation
These elements and proccesses of petroleum system should be connected
in space and time
PETROLEUM SYSTEM
element
proccess
migration
seal
source
reservoir
kitchen
permukaan
overburden
trap/field – preserved
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WHAT ‘S GEOMECHANICAL RESERVOIR ?
GEOPRESSURE GEOMECHANICS
ROCK PHYSICSPETROLEUM
SYSTEMRESERVOIR
A NEW PARADIGM IN OIL & GAS GEOMODELING
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SCOPE OF GEOMECHANICAL RESERVOIR STUDY
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OBTAINING A COMPREHENSIVE MODEL
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PORE PRESSURE AT DEPTH
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PORE PRESSURE CONCEPTS
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"Overpressure is any pore fluid pressure which exceeds the
hydrostatic pressure of a column of water or formation brine."
Adapted from Dickinson (1953)
“Overpressure results from the inability of pore fluids to escape at
a rate which allows equilibration with a column of static water
connected to the surface”
WHAT IS OVERPRESSURE?
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DISEQUILIBRIUM COMPACTION CONDITION
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SECONDARY MECHANISM(Swarbrick, 2012)
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MECHANISM OF OVERPRESSURE GENERATION
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UNDERPRESSURE
• Underpressure:
– Pressures below the hydrostatic gradient
• Causes:
– Differential discharge/recharge of reservoirs
–
Reservoir drawdown/depletion
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NORMAL COMPACTION CONDITION
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PORE PRESSURE METHODS : EATON’S RATIO
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PORE PRESSURE METHODS : EQUIVALENT DEPTH
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OVERPRESSURE MECHANISM
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PRESSURE CONTINUATION
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ROCK STRENGTH
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CONTINUUM APPROACH TO EFFECTIVE STRESS
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PORE PRESSURE IMPACT
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STRESS AROUND VERTICAL WELLS
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DIFFERENT SCALES
DIFFERENT SCALES
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STRESSES AROUND WELLBORE
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STRESSES AROUND WELLBORE
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STRESSES AROUND WELLBORE
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STRESSES AROUND WELLBORE
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WELLBORE STABILITY
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THE TECTONIC STRESS FIELD
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UNIAXIAL COMPRESSIVE STRENGTH (UCS)
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TECTONIC REGIME
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RANGE OF STRESS MAGNITUDE AT DEPTH
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WORKFLOW
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REGIONAL STUDY
Seismic Pressure Cube Geomechanical Propert ies
Overburden
Calculator
Pore
Pressure
Calculator
Shale
Trend
NCT
Calculator Eaton, Equiv.
Depth or Bowers
Vertical Stress
Pore
Pressure
Fracture
PressureEaton, Matthews &
Kelly, Breckels &
van Eeklen, etc
Fracture
Pressure
Calculator
Stress Ratio
Trend
Poisson’s
Ratio Trend
Seismic Data Conditioning/Reprocessing
Integration
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APPLICATION
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VELOCITY ANALYSIS
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ESTIMATION OF DENSITY CUBE
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CALIBRATION OF THE VELOCITY CUBE
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MW 1.14 g/cm3
MW 1.5 g/cm3
Loss 2370-2400 m
-squeeze LCM
PP FP
2333 m MD
PBU 3499 psi
HIGH RPM
SPC (Seismic Pressure Calculator) Workflow
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SPC (Seismic Pressure Calculator) WorkflowCalibrate V.int to Vp
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