Petrophysics solving the jigsaw to get the reservoir description together
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Petrophysics: solving the jigsaw to get the reservoir description together . Elisabeth Furst Tuesday 21 st August 2007 Longyarbyen Svalex 2007. Agenda. Challenges of reservoir description What is Petrophysics? The link to the different pieces of the jigsaw of reservoir description

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Petrophysics solving the jigsaw to get the reservoir description together

Petrophysics: solving the jigsaw to get the reservoir description together

Elisabeth Furst

Tuesday 21st August 2007 Longyarbyen Svalex 2007


Agenda

Agenda

  • Challenges of reservoir description

  • What is Petrophysics?

  • The link to the different pieces of the jigsaw of reservoir description

  • Integration is the key

  • History


Introduction

Introduction

  • Key questions where the petrophysicist is involved from exploration to production and IOR.

  • What have we got?

    • Lithology, fluids, reservoir geometry

  • How much?

    • Input for reserves calculations

  • How can we produce it?

    • Well planning, permeability, contacts

  • How certain are we?

    • Uncertainty analysis

The goal: 3D visualisation

of the reservoir


The jigsaw a few challenges to the disciplines work together

GEOPHYSICS

DRILLING

GEOLOGY

PETROPHYSICS

RESERVOIR

ENGINEERING

The jigsaw: a few challenges to the disciplines work together

  • We can rarely measure and see all the reservoir parameters

  • To start with we have seismic (2D 3D), geological ideas/analogs but what is the geological model/ make sense to seismic?

    • Well data 1D , seismic 2D/3D

    • geology depth, seismic in time

  • Well data is looking a few inches to a few feet into the formation, seismic: meters to kilometers

  • How do we link the static and dynamic aspects of the reservoir?


What is petrophysics

PETROPHYSICS

What is Petrophysics?

  • Petrophysics is about describing the fluids distributions and interactions in the porous system of the reservoirs and estimate the production flow capacity

    This is done by integrating well data (mechanic,

    dynamic, static, log..) to help the multi-disciplinary

    teams to get a understanding of the reservoir and

    its behaviour

  • This can range from the identification of Netpay in exploration wells, to the optimum exploitation of

    reservoirs with complex lithologies and pore geometry or other unusual features

Beyond the logs


Geological models and analogs

Geological models and analogs

GEOLOGY

  • Verify models and calibrate analogs: link between them and reality is core and logs

  • Petrophysical tools responses are lithology related

  • Examples: fluvial coarsening upwards, wells correlation

Analog


Reservoir structure

Reservoir structure

GEOLOGY

  • Bedding direction: supporting geological structure- 3D view of the borehole

  • Identify faults and describe them (inc, az, open..) linking them to seismic

Bedding direction

Fault incl/azimuth


Reservoir properties

Core

Core

SCAL

FMI

Reservoir properties

Wireline log curves

GEOLOGY

  • Model population with properties of models

  • Upscaling

  • Reserves calculations input: Por, sat, fluids….

  • Uncertainty analysis

Facies

Upscaling/

Populating

Volumes


Geophysics

Calibrate seismic to well

Predict seismic response

Identify seismic facies

Seismic attribute maps: porosity…

Key in exploration

Predicting and calibrating seismic response

Geophysics

Modelling

Facies for

seismic attributes

Seismic facies /rock properties

Porosity map

Syntool

Synthetic 1D seismic from accoustic logs


Reservoir dynamics

Predicting and identifying fluids and contacts

Input to dynamic models, permeability- test data

Relative permeability

Constant updating: monitoring production effects (RST+4D)

Well X

3190 m Crest

RESERVOIR

ENGINEERING

Sand B

Sand C

ODT-3430 m

19 m oil

P01

3438 m

Water- up-to

OWC(P50) 3545 m

P50

OWC(mdt)-3630 m

P90

Reservoir dynamics

Fluids interactions and reserves

Relative permeability is used to

predict flow and breakthrough

Pressure profiles: gradients and contacts


Well planning drilling support

Well Planning/drilling support

DRILLING

  • Correlation of well properties allow to plan wells and target the best reservoir more efficiently

  • Optimization of reservoir drilling: pore pressure estimate, rock mechanics

  • Real time stirring wells using real-time interpretation and new technology for maximum reservoir penetration

Well positioning to target best reservoir

Real time evaluation for well stirring


Petrophysics integration tool

PETROPHYSICS

Petrophysics: integration tool

  • The integration of all the aspects of the reservoir is the key to achieve the 3D visualisation

Well test

Formation tester

sampling

seismic

INTEGRATION

SCAL

SEM

The goal: 3D visualisation

of the reservoir

Well logging:

density, neutron,

resistivity, NMR,

Sonic, spectrometry

….


Solving the jigsaw

GEOLOGY

GEOPHYSICS

PETROPHYSICS

RESERVOIR

DRILLING

ENGINEERING

Solving the jigsaw

- Facies characterization

- Structural

- Sand bodies distribution

- Seismic facies

- Rock Physics

- Synthetic seismic/Tie-in

Model

Maps

Volumes

Where what to drill

compartments

Model update (4D)

- Rock mechanics

- Data Acquisition

- Real time drilling optimization

- Fluids /contatcs

- Pressure/Compartments

- Relative permeability

Targetting hydrocarbons, P&T


Petrophysics has come a long way

Petrophysics has come a long way

  • This has come a long way from the time when petrophysics was papers logs, now we have imaging, magnetic tools, signal processing to see more

  • Reservoir description is built around integration packages

  • Technology allows us to see at smaller scale (thin beds) and bring it to a 3D visualisation

Present day: digital data and packages

built to integrate while drilling

80 years ago: paper logs


What does it take to be a petrophysicist

What does it take to be a petrophysicist?

  • Numeracy, solid scientific/physics skills

  • Skills to follow innovation: technology

  • 3D subsurface visualisation ability: G&G

  • Aptitude for solving puzzles: get all reservoir aspects together

  • Communication skills : key team integrator


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