Reservoir Characterization in a Mature Canyon Reef Trend

John Hooper1,  Michael Burnett2,   Dr. R. Paul Philp3,   Dr. Roger M. Slatt4

¹PetroSEIS L.P. ,  ²PetroSEIS L.P. ,   ³University of Oklahoma ,   ⁴University of Oklahoma

The Upper Pennsylvanian Canyon reef trend associated with the Kirkland Field was discovered in approximately 1960 by Gunn Oil Company, utilizing single fold 2D seismic data. The trend was extended over the next 48 years by drilling on 2D and 3D multi-fold seismic data. In the last two years, the reservoir characterization was significantly enhanced by improvements in prestack seismic data conditioning, resulting in seismic images of interpreted tidal channels which were not detectable on prior versions of data processing. These tidal cuts clearly separate the reef into isolated reservoir compartments. Structure maps on the top of reef and the top of porosity underlying the tight lime cap were made from an integrated interpretation of well tops and prestack conditioned 3D seismic data followed by cokriging the seismic depth interpretation with the well tops.

Two wells were completed as oil producers in 2008. These wells were tested, primarily on the strength of the integrated structure map and favorable petrophysical and DST analysis in the planned reentry well. Rigorous multi-mineral petrophysical analysis and cased hole interpretations were combined with DST data, mudlogs, and sequential testing in the evaluation and completion of these two wells. This work resulted in the observations that there was water above oil in one of the wells and that fracturing into the lime cap was not ubiquitous.

Statistical treatment of GCMS geochemical analysis demonstrates clear evidence of measurement repeatability, but significant differences in the oil composition between wells. The differences between wells may result from reservoir compartmentalization.

AAPG Search and Discover Article #90097 © 2009 Tulsa Geological Society, Tulsa, Oklahoma

 

 

�������������������������������������������������������������������������������������������������� �������������������������������������������������������������������������������������������������������������������������������