Abstract

Assessment of caprock systems will be highly site-specific and rely on a multi-disciplinary approach, utilising a combination of seismic surveys, exploration wells, wireline log data, stratigraphic and sedimentological analysis, well tests and laboratory scale testing of caprock samples. The study has presented a qualitative methodology for assessment of seal potential at the basin scale. The seal capacity of a caprock system may be defined as the capacity, geometry and integrity of the caprock. Seal capacity refers to the maximum CO<sub>2</sub> column height that can be retained in the underlying reservoir, before pressure exerted by buoyancy exceeds capillary entry pressure, thus allowing CO<sub>2</sub> to migrate through the caprock. Seal geometry refers to the thickness and lateral extent of the caprock. Seal integrity refers to caprock geomechanical properties, in the context of ambient stress fields that may be modified by CO<sub>2</sub> injection and any associated abstraction of reservoir fluids. Key knowledge gaps identified for further research include: wettability and interfacial tension effects on supercritical CO<sub>2</sub>-water-rock systems: hydrodynamic effects of large scale injection in deep saline formations; effects of faults on caprocks in predictive modelling. There is also a case for the compilation of a comprehensive database on caprock systems, including mineralogical and petrophysical properties, to provide analogue data in storage site assessment. A compendium of caprock properties at existing CO<sub>2</sub> storage sites would also prove useful.
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Product Type/Sub Type

nonGeographicDataset - External Publication

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2011

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

Keywords

External Publication
carbon dioxide
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

adf6b18d-d1f3-08fb-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2011-09-28

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Related Links
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays