Hi Chris Thank you for your reply. And thank you for your paper reference - I'll take a look at your probability plots.
Yes the apparent lognormality of oil and gas fields which moves more to a Pareto form with progressive and mature exploration is explained by undersampling at the low end that eventually gets sampled as the economics of an area and technology make smaller fields viable. However I am surprised that my simulated oil and gas fields - based on basin modelling - and no economic and exploration-process involvement also produces lognormal populations of fields. And that teh undersampling is obvious throughout most of the size ranges - not just the small size end, I think Syed's suggesting to use a larger dataset from a mature area is a good way of seeing what the distribution is more like. Kind regards Beatrice Hydrocarbons Group Institute of Geological and Nuclear Sciences Limited 69 Gracefield Road, Lower Hutt, WELLINGTON NEW ZEALAND 64 4 570 4821 [EMAIL PROTECTED] www.gns.cri.nz
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