PRINCIPLE AND APPLICATION OF ESTIMATION ON THE DISTRIBUTION OF A SET OF SUBSURFACE FRACTURES BY CORE DATA

A new method to estimate the distribution of a set of subsurface fractures by core data is suggested in this paper.In order to find out optimum distribution of fractures with a given distributive pattern,the pattern must be known in advance.When estimating the distribution of generally undetermined subsurface fractures,the method mentioned above can be used repeatedly selecting different distributive patterns in turn. Then,the respective minimum target function values are compared. Among them, the one with minimum can be considered as the best approximation to practical fracture distribution. Case applications show that if fracture patterns are selected properly, the estimated results from the above-mentioned method are close to measured values;the best estimates for practical fracture distribution can be obtained theredy.