b'Seismic window contact indicator as a DHI. Of course a \x1cat spot may be caused by something other than changes in \x1cuid such as diagenetic e\x1eects, residual multiples (they are always hanging about), igneous intrusives and unconformities.Dunne and Parsons suggest that modelling is helpful, but not just any modelling. They propose holistic AVO modelling where the depth structure and amplitude response are modelled simultaneously since both properties rely on the same P wave velocity. The result is a better understanding of a prospect and hopefully fewer dry holes.Flat spots are commonly not \x1cat so we should stop calling them \x1cat spots.Figure 4 is an example from the NW Shelf of Western Australia. There are some obvious cross cutting re\x1cectors that are Figure 3.Example of a tilted \x1bat spot, most likely caused by overburden velocity variations and also push- not quite \x1cat that become shallower from down beneath a gas accumulation caused by the slower velocities in the gas saturated reservoir. Image provided by Jarrod Dunne and James Parsons. left to right. Shortly after this oil \x1deld was discovered, there were discussions about whether the oil-water contact was at a constant depth or was tilted, or even if there were separate pools with di\x1eerent contacts in each (Figure 5). To complicate matters there was a permit boundary halfway across the \x1deld with di\x1eerent companies in each permit. This led to talks about unitisation. Obviously the companies either side of the boundary had an interpretation of the contact indicator that was most advantageous for their company.The unitisation talks broke down.Figure 4.Flat re\x1bectors indicating an oil-water contact becoming shallower from left to right. ThePerhaps some modelling would have di\x1eerence in depth is real. There is a permit boundary about halfway across this structure and the rivalhelped.permit holders held many meetings to determine what was happening and resolve estimated reserves on either side of the boundary. ReferenceDunne, J. and J. Parsons, 2023. Direct hydrocarbon indications from \x1cuid contactsstop calling them \x1cat spots! AEGC 2023 Extended AbstractsI would like to thank APPEA for recognising my media credentials and o\x1eering me a place at the 2023 APPEA conference in Adelaide. Media Figure 5.Two possible models for the geology. There could be separate pools separated by sub croppingdelegates are sponsored by Santos.shales or a single contact that is being distorted by aquifer \x1bow.29 PREVIEW JUNE 2023'