This paper is a geomechanics case study in which timelapse timeshifts have been accurately measured over the producing HP/HT Franklin and Elgin gas condensate fields then inverted to production-induced stress and strain changes throughout the reservoir, overburden and underburden. The interpretation of the result can be used to constrain the coupled reservoir-geomechanical model with the objective of enhancing its capacity to detect parts of the reservoirs that have not been depleted, explaining casing integrity problems and anticipating potential wellbore instability problems on infill wells.
Bishop and Styles are to be congratulated for attempting the difficult task of validating a tomographic reconstruction technique on the basis of a field experiment. However, in their closing remarks they state that "even when (they) had control of most parameters only moderate image qualities were obtained " ; we cannot agree that there was sufficient planning of the trial for it to represent a fair and objective test of geophysical seismic velocity tomography, as we discuss below.The paper is of particular interest because it highlights so effectively the need for careful planning and design before the implementation of a technique of this type. In particular, when searching for particular targets, the following points should be taken into consideration.
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