Predicted column heights for carbon dioxide storage in New Zealand based on membrane seal capacity

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SR_2015-036-pdf
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Field, B.D. 2015 Predicted column heights for carbon dioxide storage in New Zealand based on membrane seal capacity. Lower Hutt, N.Z.: GNS Science. GNS Science report 2015/36. 21 p.; doi: 10.21420/G26H04

Abstract: The underground storage of carbon dioxide requires assessments of many factors but particularly of security of storage. One of the main contributors to security of storage is the membrane capacity of seal units. This report uses mercury injection capillary pressure threshold entry pressures to assess the membrane seal capacities and hence column heights of various New Zealand mudstones. Column heights are estimated at in situ conditions for the samples analysed, except that where samples were from outcrops or from well depths shallower than 1000 m, column heights were estimated based on an arbitrary depth of 1000 m (to approximate a reasonable shallow limit for supercritical carbon dioxide storage). There are few identifiable trends in column height, most probably because of variations in grain size and burial histories, but the results overall indicate that there are generally good membrane seal capacities in mudstones of Eocene to mid Miocene age at depths suitable for storage (1000–2500 m). (auth)