Integrating seismic derived rock properties with horizontal well induced fractures in the Duvernay

Ronald M. Weir, David W. S. Eaton, Laurence R. Lines, Donald C. Lawton

The Duvernay formation is a major zone of interest for unconventional oil production. It is the stratragraphic equivalent of the lower Leduc, and is commonly believed to be the source rock for most of the Devonian age production in Alberta. Microseismic Techniques have been used to evaluate the efficiently of hydraulic fracture stimulations. The Duvernay has been drilled horizontally, and hydraulic fracking has been deployed to enhance oil production. Microseismic surveys have been carried out in a number of areas to determine fracture length, height, and general efficiency of the completion. In this paper, a method of using seismic attributes is proposed to optimize drilling programs. Seismically derived geological attributes can be used in the well placement and fracture stimulation intervals to optimize recovery. To date, most Duvernay drilling patterns have been laid out in a uniform pattern, orthogonal to the regional stress, or parallel to the boundaries of the oil lease. localized geological rock properties are used in the initial planning stage, but not in well placemen; a common assumption is the rock is uniform, and fractures will occur governed by the regional stress regime. Seismic derived attributes can provide valuable information with respect to well placement, and what facies are favorable to hydraulic fracture stimulation, fracture length, and direction. Seismic attributes can and should be used to direct horizontal well placement, as well as completion programs. Some completions perform well, whilst others fail. Fracture patterns and induced seismicity may preferentially follow geologic depositional patterns; this should be considered in well planning.