OEMG conducted an Aquares survey and prepared a ground model based on geophysics and targeted boreholes (early stage of the IDGM) for Mitsubishi-Talisman on the Daru Port expansion in Papua New Guinea.
Previous studies had been conducted over 2 years at significant cost, with 77 vibracores and 116 boreholes and extensive analogue surveys undertaken. Key project gaps were identified after the initial surveys were completed and no borrow areas were identified to supply fill material. There was also no understanding of dredge risk as boreholes were randomly assigned and not targeted to areas of potential geological risk.
OEMG conducted an Aquares survey including 600 line kms over just 10 days. Survey data was fully processed and provided to the vessel every 2 days to ensure that key areas were identified and adequately surveyed prior to demobilisation.
OEMG’s survey identified significant dredge risks and mitigation strategies were able to be developed, resulting in substantial reduction in dredge costs. There were also significant borrow areas identified to supply fill. 3D grids were developed to allow for volume calculations and 4D visualisations were provided in a GIS environment to improve decision making (early iteration of the IDGM).
Project review: The cost of using un-targeted boreholes!
In real terms: