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Time-lapse 3D seismic monitoring was conducted in the Japan Canada Oil Sands Limited (JACOS) Hanging-stone steam-assisted-gravity-drainage (SAGD) operation area in Alberta, Canada, to delineate steam-affected areas. The time-lapse surveys, acquired in February 2002 and March 2006, show distinct response changes around the SAGD well pairs. In addition, 3D P-SV converted-wave processing and analysis were applied on the second 3D data set [recorded with three-component (3-C) digital sensors] for a reservoir characterization study. Background information on the Hangingstone SAGD operation is contained in Kato et al. (2008).

Time-lapse 3D Seismic Data

Figure 1 shows a map of the two 3D seismic surveys and SAGD well locations in the field. Black solid lines represent SAGD well paths, and the red dotted line indicates a north—south line (referred as NS hereafter) that will be used throughout this study. The first 3D seismic (baseline survey = 5.4 km2) was acquired in 2002 to construct detailed 3D geologic models for reservoir characterization. The production of the five eastern SAGD well pairs (A, B, C, D, and E in Figure 1) commenced prior to the recording of the first 3D survey. After the first 3D survey, steam injection was implemented in four stages at 10 additional western SAGD well pairs before 2006. The second 3D survey was conducted in 2006 in the northern part (4.3 km2) of the 2002 baseline survey, where the active 15 SAGD wells exist.

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