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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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