A large challenge in drilling a horizontal well is that they are planned using a seismic visualisation of the reservoir, but are drilled using a visualisation of borehole scale, which is much smaller. This results in only a vague structural outline which can be trusted from the seismic data, which in turn necessitates the geosteering process. Furthermore, even the deepest reading bed boundary mapping tool currently available can only visualise one or two boundaries in anything other than a relatively thin reservoir for referencing back to the seismic data. Additionally, evaluating a horizontal reservoir must be carried out using devices which only see a limited distance into the formation. With current commercially available technology, there is no measurement which can detect a range of reservoir variation vertically away from the wellbore. A new generation deep directional EM tool, has a greatly enhanced depth of investigation which is capable of detecting formation boundaries exceeding 80-ft from the borehole, coupled with the ability to detect multiple boundaries in any direction. As well as being able to tie the borehole directly to the seismic scale, this combination of measurements allows for the evaluation of the reservoir over the entire formation thickness.


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