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Tangguh Geotechnics and Geohazards Mitigation Part.2: Solving the puzzle
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering, Apr 2018, Volume 2018, p.1 - 5
Abstract
This paper has shown that the integration of geophysical and geotechnical datasets by a multidisciplinary team into a ground model can be used to support informed decisions about the development of offshore facilities in Berau-Bintuni Bay. The ground model has evolved with each phase of data acquisition and supported the elimination of initial conservative assumptions as additional data increased the resolution. The ground model enabled the early identification and avoidance where possible of hazardous conditions identified. It also enables, within the limitations of the data resolution, to extrapolate shallow soil conditions beyond locations ‘ground truthed’ with physical sampling. Example applications of this ground model for the Tangguh Expansion Project have been presented informing the selection of acceptable locations for installation and in-place performance of mobile self-elevation jack-up drilling unit foundations within laterally and vertically highly variable sediments affected by active seabed processes. The same ground model has also been successfully interrogated to: decide on the site selection of fixed platforms; support the successful installation of piles and well conductors; refine routing of pipelines to lessen the impact of certain geohazards, such as sandwaves and areas of significant seabed mobility and mitigate the impact of potential seabed liquefaction during seismic events.