Madeleine Trend

The Angel Field is located at the northern end of the NE-SW-oriented Madeleine Trend in the Dampier sub-basin, which forms part of the Silurian to Holocene Carnarvon basin, offshore Western Australia (Fig IB). The Madeleine Trend is a major fault-controlled anticlinal feature that follows the main depositional axis of the Dampier subbasin and along which several other oilfields are located, including the nearby Cossack and Wanaea Fields (Fig. IB). The stratigraphy of the Dampier sub-basin consists of marine and deltaic elastics and Tertiary carbonates (Fig. 3). 

Amplitudes are strongest near the crest of the Angel Field structure/Madeleine Trend, and decrease downslope until they phase out completely in more basinal areas of the Angel Field, well below... 

NNE-SSW-trending ridge first developed at reservoir level during the Mid-Eocene in response to differential compaction over the Madeleine Trend (Fig. 22a). From the Mid-Miocene onwards, the incipient drape structure began to gently tilt towards the northeast and relief increased (Fig. 22b). By the Late Miocene, the northerly tilt and continued differential compaction had produced a time closure at reservoir level, coinciding with the present-day occurrence of the high-amplitude zone... 

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