The Cambro-Ordovician carbonate platform on Ptarmigan Exploration License EL 1120 was mapped using over 600 km of 2D Time Migrated seismic data acquired by Mobil in 1991. During the recent re-interpretation of this reprocessed data, three main seismic horizons have been mapped: the Top Lourdes Formation, the Top Tablehead Formation (near the Aguathuna Limestone reservoir) and the Top Petit Jardin Formation. Subsequently, three Time Structure maps for these horizons were created covering only the area where data quality was adequate (Figures 2.9 thru 2.11).
The summer 2012 reinterpretation project resulted in the definition of two firm prospects: 1. the Lark Harbour (former prospect B and parts of C in Sproule 2008 evaluation report) and 2. the York Harbour (former parts of prospect C). In addition, the Bay of Islands lead cluster (previous lead A) and leads E, F and G have been confirmed. These prospects and leads represent two distinct play types. Lark Habour and York Harbour prospects are tilted fault blocks of the carbonate platform. They have fault-bounded proven closure at all the lower Paleozoic levels beneath the capping Lourdes Limestone. The Bay of Islands leads are also rotated fault blocks, but need additional seismic coverage to be fully defined. Leads E, F and G (Figure 2.12) are thrust sheets of the Humber Arm Allochthon (the Cow Head Group). They are only partially defined by several seismic lines and need more coverage. These thrust sheets have a seismic signature similar to that of the carbonate platform and thus could involve platform and/or near slope-break platform rocks with good to excellent porosity development.