Overpressure prediction by mean total stress estimate using well logs for compressional environments with strike-slip or reverse faulting stress state

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Title: Overpressure prediction by mean total stress estimate using well logs for compressional environments with strike-slip or reverse faulting stress state
Author: Ozkale, Aslihan
Abstract: Predicting correct pore -pressure is important for drilling applications . Wellbore stability problems , kicks , or even blow -outs can be avoided with a good estimate of porepressure . Conventional pore -pressure estimation methods are based on one -dimensional compaction theory and depend on a relationship between porosity and vertical effective stress . Strike -slip or reverse faulting environments especially require a different way to determine pore -pressure , since the overburden is not the maximum stress . This study proposes a method which better accounts for the three -dimensional nature of the stress field and provides improved estimates of pore -pressure . We apply the mean total stress estimate to estimate pore -pressure . Pore pressure is then obtained by modifying Eaton ? ? ? ? ? ?s pore -pressure equations , which require either resistivity or sonic log data . The method was tested in the Snorre Field in the Norwegian North Sea , where the field changes from strike -slip to reverse stress state . Eaton ? ? ? ? ? ?s resistivity and sonic equations were used to predict pore -pressure in this region by replacing the vertical stress by the mean total stress estimate . Results suggest that the modified Eaton method with resistivity log data gives better results for the area than the conventional method . The ratio of maximum horizontal stress to minimum horizontal stress throughout each well should be known for best results .
URI: http : / /hdl .handle .net /1969 .1 /4762
Date: 2007-04-25

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Overpressure prediction by mean total stress estimate using well logs for compressional environments with strike-slip or reverse faulting stress state. Available electronically from http : / /hdl .handle .net /1969 .1 /4762 .

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