Exploration of Ireland's Donegal Basin in the last 10 years concentrated on structural plays within the Triassic Sherwood Sandstone and culminated in the Corrib gas discovery in 1998. Despite this economic success, the structural history (and hence petroleum geology) of the basin remained poorly understood, due in large measure to igneous intrusives and salt which degrade seismic data quality. These problems caused operators to consider alternative methods and, given the success of potential fields in adjacent areas (Faroes, Irish Sea), new gravity and magnetic surveys were undertaken in 1999.

Before 1999, the only speculative magnetic data set over Donegal Basin...

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