Time lapse view of the Blackfoot AVO anomaly

Han-xing Lu, Gary F. Margrave, Colin C. Potter

In the Blackfoot field, southeast of Calgary there is an incised glauconitic valley system . From well logs in this area, synthetic seismic gathers and amplitude versus offset (AVO) curves indicate that at top of the formations of Glauconitic Channel Top (GLCTOP) and the Shunda-Mississippian (MISS), the AVO effects are quite obvious. Several seismic surveys were done in this area (Blackfoot 3D survey in 1993, Blackfoot 3C-3D survey in 1995, Blackfoot 3C-2D survey in 1997), and the AVO effects are shown in these migrated offset-limited sections.