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| Correlated well log (#1 Nelson) located on the northwest edge of Hutchinson |
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Below are excerpts from a letter from Joe Ratigan to Dennis Clennan, Hutchinson Director of Public Works, including a well log provided by IMC Salt:
April 6, 2001
Mr. Dennis M. Clennan, P.E.
Director of Public Works and Engineering
City of Hutchinson
P.O. Box 1567
125 East Avenue B
Hutchinson, KS 67504-1567
Dear Dennis:
Attached is a figure that illustrates the results of borehole logging commissioned by IMC Salt when they drilled a well in 1998. The information illustrated in the log (for the depth interval of 200 to 250 feet) is the gamma ray log and the value of the Dynamic Young's Modulus. The Dynamic Young's Modulus is calculated from the sonic velocity travel time log and the bulk density log. The Dynamic Young's Modulus indicates the "stiffness" of the formation. The higher the modulus, the stiffer the rock. The gamma ray log is an indication of natural radioactivity. Shales commonly exhibit a gamma signal; whereas, limestones, dolomite, and salts do not.
The IMC log indicates that there is a very stiff rock layer (perhaps a dolomite) at a depth of about 227 feet with a thickness of about 2.5 feet. This unit appears to be approximately at the top of the Wellington Shale, and thus, is consistent with the dolomite bed postulated by the Kansas Geologic Survey as the "gas transmission zone." This very stiff, brittle unit is undoubtedly fractured in some locations underlying Hutchinson, and that fracture pattern most likely follows the underlying geologic structure, as the Survey has suggested. I would suggest that you forward this information to the Kansas Geologic Survey since the quality of the log results is excellent and it should assist the survey in quantifying the thickness as well as other properties of this zone.
By copy of this letter, I wish to extend my appreciation to IMC Salt for making this information available to the city of Hutchinson. If you have any questions, please let me know.
Sincerely, Joe L. Ratigan, Ph.D.
Senior Vice President and Principal Consultant
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