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Improving our understanding of fluid transport in rocks – CO 2 sequestration. Tim Senden Department of Applied Mathematics Research School of Physics and Engineering. Introduction.

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improving our understanding of fluid transport in rocks co 2 sequestration

Improving our understanding of fluid transport in rocks – CO2 sequestration

Tim Senden

Department of Applied Mathematics

Research School of Physics and Engineering

introduction
Introduction
  • Underground storage of CO2 has been proposed as a means of mitigating climate change through ghg emissions.
  • Several major challenges to address
    • Volume of CO2 that can be stored within a given geological formation
    • Proximity to CO2 source (powerplant, gas field)
    • Long term storage security (e.g. leakage rate must be less than 0.01% per year)
slide3
CO2-rock interactions are a source of uncertainty in assessment of CO2 storage viability
    • Change injectivity (porosity, permeability etc)
    • May alter seal rock integrity
    • Mineral trapping / contaminant liberation

… but supercritical CO2 is an unusual beast!!

  • Facts: Above 31°C and 73 atm (not uncommon in reservoirs/aquifers);
  • ½ as dense as water, and 1/10th as viscous but flows like a liquid.
  • while it does not mix with water is does react to make the water acidic
  • it dissolves in hydrocarbons.
slide4
Saline aquifer
  • Sleipner (Norway)
  • Globally ubiquitous
  • Need to ensure security to avoid groundwater contamination (true for any lithology)
  • Mineral trapping small volumetrically but potentially important (changes to flow properties)

So how to study this troublesome fluid in microscopic pores within rock?

Image source: Statoil

slide5

The X-ray micro-Tomography Facility

Micro-focus X-ray source

Rock

specimen

Double helical trajectory means very high fidelity data from micron to centimeter scale

slide6

We must manage our hydrocarbon resources efficiently

Physical Parameters Reservoir Descriptors

Electrical Conductivity Oil Saturation

Dielectric Permittivity Water Saturation

Neutron Gas Saturation

Borehole Pressure Porosity

Sound Velocity Permeability

NMR Response

Gamma-ray x-section

Capillary Pressure

Instead of a single data point we can extract 100’s from a single core

How does fluid permeability correlate to other observables ?

slide8

Simulation

Experiment

  • Triaxial cell
  • 8 – 25 mm cores
  • Beryllium cell
  • Axial strain < 1000 atm
  • Confining pressure < 100 atm
  • No creep over 8 hr
  • Designed for scCO2
  • at present using analogue fluids
mardie green sand barrow is wa
Mardie Green Sand – Barrow Is, WA

Native state

After exposure to CO2 equivalent

Using analogue fluids

Courtesy of Rowan Romeyn (Hons. student).

slide10

Since 2000

  • Christoph Arns **
  • Tomaso Aste
  • Holger Averdunk
  • Gareth Crook
  • Andrew Fogden
  • Abid Ghous
  • Stephen Hyde
  • Anthony Jones
  • Alexandre Kabla
  • Andrew Kingston
  • Munish Kumar
  • Mark Knackstedt
  • Shane Latham
  • Evgenia Lebedeva
  • Ajay Limaye *
  • Jill Middleton
  • Glenn Myers
  • Val Pinczewski **
  • Vanessa Robins
  • Rowan Romeyn
  • Mohammad Sadaatfar
  • Arthur Sakellariou
  • Tim Sawkins
  • Adrian Sheppard
  • Rob Sok
  • Michael Turner
  • Trond Varslot
  • Paul Veldkamp

* VizLab ANUSF

** UNSW

Since 2006

The Digicore Consortium has included; Saudi Aramco, ExxonMobil, Shell, Chevron, BP, Total, Schlumberger, Baker Hughes, Abu Dhabi Onshore, Maersk, Petronas, PetroBras, Japan Oil & Gas, ONGC (India), BHP, BG, Conoco Philips, FEI, Digitalcore

Since 2009

ANU/UNSW spin-off

australian national low emissions coal research and development anlec
Australian National Low Emissions Coal Research and Development(ANLEC)

2011

In partnership with Digitalcore and ANU received a multi-million dollar grant to develop methods to investigate CO2 – rock interactions in Australian aquifers. 3 years.

Building an open access data repository, visualisation and simulation platform for tomographic data