Smaller numbers of cases have been detected in several other provinces, but the vast majority of victims are still in Guangdong, with more than 1, 250 reported cases though a declining curve of new victims.
12.
Part of the problem in evaluation is also the uncertainty of decline curve analysis from early data : shale gas wells can fall off sharply during the first year or two, then level off to a slower decline rate; the shape of the curve, and therefore the ultimate recovery, is difficult to predict from early production rates.
