The only reason i can think of is they drilled those to those two formations is because it was the area they where inerested in at the time.
A third exploration phase in Australian waters was initiated in the late 1990s to 2000 by Shell Development (Australia) Limited, Woodside Energy Ltd and Woodside Offshore Petroleum Pty Ltd. Acquisition of new seismic and reprocessing of existing seismic data preceded the drilling of several wells by Shell Development (Australia) Limited in 1998 throughout the Malita and Calder graben. Evans Shoal 2 was a gas appraisal well, proving favourable deliverability from Plover Formation reservoirs with gas flows of 25 MMscf/d. Also within the Plover Formation, a proven gas zone was discovered at Chuditch 1, whereas Lynedoch 2 encountered a tight gas column. Wonarah 1, which targeted Late Cretaceous intra-Wangarlu Formation sandstones, did not encounter any significant hydrocarbons. During 1995 to 1998 Shell Development (Australia) Limited (1998a), Woodside Energy Ltd (1999) and Woodside Offshore Petroleum Pty Ltd (1995, 1998, 1999) appraised the Troubadour and Sunrise accumulations. Tyche 1 was the last well drilled by Woodside Energy Ltd and Shell Development (Australia) Pty Ltd (2000) in the region at this time. The well targeted a shallow stratigraphic play, but the well was plugged and abandoned without encountering significant hydrocarbon shows.
In summary, 15 wells have been drilled on the eastern part of the Sahul Platform, the Malita Graben and the Calder Graben: of these wells, 9 are hydrocarbon discoveries, giving a technical success of 60% and a 33% historical success rate for accumulations greater than 1 Tcf (5 discoveries). To date, over 20 Tcf of gas with several hundred million barrels of condensate reserves have been proven within this region. These statistics do not include the Abadi gas accumulation in Indonesian waters of the Calder Graben.
So out of the 9 wells that where hydrocarbon discoveries two of those are owned by MEO, and one of those heron3 is getting proved up right now.
Read here for some Exploration History and hopefully join some more dots in your MEO investment.
