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The Northern Australia CO2 Store Project has extended investigations for safe, long-term containment of large volumes of CO2 (up to 100 million tonnes) to support liquefied natural gas and other industries in a decarbonised future. Most natural gas fields in the Petrel Sub-basin and the surrounding region have relatively high native CO2 content. This collaborative project improved storage characterisation, evaluated geomechanical risks and estimated engineering demands necessary to progress the concept to ‘prospect’ and ‘resource’. New data have significantly advanced the geological and structural understanding in the region, improving chrono- and litho-stratigraphic correlations, with new well ties across the basin. However, the re-mapping has thrown up new questions that require additional data (e.g. new stratigraphic wells, 3D seismic data) to address those knowledge gaps. Geomechanical modelling in the area has tested (to extreme levels) the potential impact of injection on faults in the area, further de-risking the likelihood of upward migration and leakage. The region could utilise an abundance of energy and feedstocks in the form of solar, natural gas, hydrogen and CO2 to become a future decarbonisation and industrial hub while managing major emissions with offshore CO2 storage.

TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractIn the present paper we describe the workflow followed to estimate the field state of stress (FSS) for a well stimulation design in a faulted field. The customer demand was about the fracture gradients along the well-bore trajectories and about the fracture paths. To satisfy the customer demand an integrated study was performed using field data and wellbores evidences. On the base of available information a numerical model has been used that allows taking into account the complex geometry of the faults. The different FSS have been applied to three well-bores and the obtained break-outs have been compared to the observed ones. Two example of FSS, the worst and the best one, are illustrated and compared.