--> Abstract: Radiometric Surveying Applied to an Evaluation of Sorrento Field, Cheyenne County, Colorado, by Alton V. Gallager; #90952 (1996).
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Abstract: Radiometric Surveying Applied to an Evaluation of Sorrento Field, Cheyenne County, Colorado

Previous HitAltonTop V. Gallager

The radiometric survey was performed in July of 1994 as part of the Colorado School of Mines Reservoir Characterization Project Phase V. The 5.5 square mile field study consisted of geologic; geophysical; reservoir engineering; geochemical; 3-D seismic and radiometric investigations over the Sorrento Field.

Radiometric data was acquired over the study area using a 512 cubic inch Nal detector system and four channel digital acquisition system. Twenty foot stations were acquired along the same traverses as the source and receiver lines of the 3-D seismic program. Profiles were plotted for each line. Data was normalized and Z-Transform and ratio maps were produced. A profile interpretation map indicated the presence of several lineaments possibly related to fracturing now known to exist within the study area as a result of the 3-D seismic survey.

An experimental north-south profile was also obtained through the study area using a Nal detector and full spectrum analyzer capable of 60,000 CPS. Data was processed into 1000 channels of data. An analysis of the full spectrum data indicates the presence of two discrete (4 to 6 KeV) windows in the lower portion of the gamma spectrum that exhibit a consistent high response over the productive portion of the field. The normally expected low radiometric response over petroleum reservoirs appears to be a function of a general overall decrease, principally in that portion of the gamma spectrum below 1.50 MeV.

AAPG Search and Discovery Article #90952©1996 AAPG Rocky Mountain Section Meeting, Billings, Montana