--> Abstract: Magnetic Resonance Data Identification of Production in Difficult Carbonate Reservoirs, by Elizabeth Bartlett Culp, Charles H. Smith, Jim Bray, and Sandeep Ramakrishna; #90072 (2007)

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Magnetic Resonance Data Identification of Production in Difficult Carbonate Reservoirs

Elizabeth Bartlett Culp1, Charles H. Smith2, Jim Bray2, and Sandeep Ramakrishna2
1Chesapeake Energy Corporation, Oklahoma City, OK
2Halliburton Energy Services, Oklahoma City, OK

Middle Pennsylvanian Atoka age carbonate wash along the Wichita Mountain Front, Anadarko Basin, western Oklahoma, poses one of the most difficult log interpretation puzzles in the continental United States. Deposited as a series of overlapping submarine fans in which the clastic source material is Cambro-Ordivician Arbuckle Limestone, the formation is complex and inconsistent from well to well. Traditional open hole logs and log interpretation techniques have not provided reliable parameters to determine potential pay. To address this issue, magnetic resonance image logs (MRIL) were run in an attempt to add another piece of information.
Initially, the MRIL results proved inconclusive. The combination of MRIL results with production test data for several wells, however, made it possible for conclusions to be formed. The MRIL provides direct measurements of bin size distribution, as well as calculated permeabilities and water saturations.
This paper presents a case study of four Atoka age carbonate wash wells in which the MRIL was used as the primary log to determine net pay and, in turn, perforations. Log data from standard triple combo logs and mud logs were used with the MRIL bin description data. Examples from the case study show that the MRIL identified pay that would have been overlooked using conventional open hole log analysis. Production results show the effectiveness of the MRIL in this formation, both in showing where to perforate and where not to perforate.
During the continued development drilling in the carbonate wash field, the MRIL has proven to be an effective tool in determining net pay in this complex clastic carbonate system. We surmise that this technology will apply to many carbonate and/or clastic reservoirs.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece