PP and PS imaging and reflectivity of the Ardley coal zone, Red Deer, Alberta Sarah E. Richardson Don C. Lawton

Study Area

Survey Geometry

Cased Hole Well Logs

Raw Data P-P S-S P-P S-S

Vp/Vs Analysis of Shallow Strata

Mini-P VSP Results

Big-P vs. Mini-P Corridor Stacks Synthetic seismogram using extracted big-P wavelet Synthetic seismogram using extracted mini-P wavelet Big-P corridor stack Mini-P corridor stack Hz sweep8-250 Hz sweep

Big-P Amplitude Spectrum

Mini-P Amplitude Spectrum

Mini-S VSP Results

Mini-S Amplitude Spectrum

Source Comparison

Walkaway VSP-CDP Transform

Walkaway VSP-CCP Transform

Numerical Modeling

Calculated Coal Reflectivity

Extracted Coal PP Reflectivity

Extracted PS Coal Reflectivity

Conclusions Mini-P source is ideal for imaging coal seams at this site Vp/Vs is high (~5) near surface, decreasing to ~2.5 at 300 m P-S waves better resolve coal because of fewer tuning effects Tuning effects in P-P data may give indication of vertical continuity of coal zone

Acknowledgements Suncor & Industry Partners Alberta Research Council Larissa Bezouchko, Schlumberger Mike Jones, Schlumberger Alberta Energy Research Institute Natural Sciences and Engineering Research Council of Canada Alberta Ingenuity Fund The CREWES Project