Characterization of Mississippian Osage Chat in South-Central Kansas

Kansas Geological Survey
Open-file Report 2002-50


Understanding petroleum production from, and future potential of, the chat requires understanding the nature of deposition and diagenesis, the role of tectonics, lithofacies controls on petrophysical properties, and log response to these properties. Important conclusions are:

Depositional, Diagenetic, and Tectonic



These models provide some additional insight from the extensive work that has preceded this study into the chat of south-central Kansas. They also provide additional data in understanding the nature of controls on reservoir properties that could apply to other shallow shelf chert reservoir systems.

Selected References

Brunton, F.R., And O.A. Dixon, 1994, Siliceous sponge-microbe biotic associations and their recurrence through the Phanerozoic as reef mound constructors: Palaios, v. 9, p. 370-387.
Cole, V.B., 1976, Configuration of the top of Precambrian rocks in Kansas: Kansas Geological Survey, Map Series, no. M-7, 1 sheet, scale 1:500,000.
Curtis, G.R., 1968, Nichols field, Kiowa County, Kansas, , in Beebe, B.W.; and Curtis, B.F., (eds.); Natural gases of North America; part 3 (natural gases in rocks of Paleozoic age), v. 2, American Association of Petroleum Geologists, Memoir, no. 9, p. 1582-1587.
Duren, J.D., 1960, Some petrophysical aspects of the Mississippian "Chat", Glick Field, Kiowa County, Kansas: Shale Shaker, p. 316-321.
Duren, J.D., 1967, Some petrophysical aspects of the Mississippian "Chat", Glick Field, Kiowa County, Kansas: The Log Analyst, p. 34-39.
Elster, T., 1965, Donald field: Kansas Geological Society, Kansas Oil and Gas Fields, vol. 4, p. 68-77.
Euwer, R.M., 1968, Glick field, Kiowa and Comanche counties, Kansas, in B. W. Beebe and B.F. Curtis, eds., Natural gases of North America; part 3 (natural gases in rocks of Paleozoic age), vol. 2, American Association of Petroleum Geologists, Memoir, no. 9, p. 1576-1582.
Frensley, R.W. and J.C. Darmstetter, 1965, Spivey-Grabs field: Kansas Geological Society, Kansas Oil and Gas Fields, vol. 4, p. 221-228.
Gerlach, P., 1998a, Pre-Pennsylvanian subcrop map: Kansas Geological Survey, Digital Petroleum Atlas,, posted Nov., 1998.
Gerlach, P., 1998b, Structure on Mississippian System: Kansas Geological Survey, Digital Petroleum Atlas, (, posted Nov. 3, 1998
Goebel, E.D., 1968a, Mississippian rocks of western Kansas: AAPG Bulletin, v. 52, p. 1732-1778.
Goebel, E.D., 1968b, Mississippian System, in D.E. Zeller, ed., Kansas Geological Survey Bulletin 189, p. 17-21.
Gutschick, R.C. and C.A. Sandberg, 1983, Mississippian continental margins of the conterminous United States, in D.J. Stanley and G.T. Moore, eds., The shelfbreak: critical interface on continental margins, SEPM Special Publication No. 33, p. 79-96.
Kruger, J.M., 1997, On-line Gravity and Magnetic Maps of Kansas: KGS Open-file Repts. 96-51 and 97-72, (posted August 25, 1997).
Kruger, J.M., W.L. Watney, and R.A. Olea, 1999, Use of gravity and magnetics for low cost exploration and development in mature areas such as Kansas: Transactions, American Association of Petroleum Geologists, MidContinent Section, p. 51.
Lambert, M.W., 1988, Sub-Pennsylvanian subcrop map of Mississippian units in the Salina basin: Kansas Geological Survey, Open-file Report, no. 88-37, 1 sheet, scale: 1:500,000.
Lane, H.R., and T.L. De Keyser, 1980, Paleogeography of the late Early Mississippian (Tournaisian 3) in the central and southwestern United States: in T.D. Fouch and E.R. Magathan, eds., Paleozoic Paleogeography of west-central United States, Rocky Mountain Section, SEPM, p. 149-159.
Maples, C.G., 1994, Revision of Mississippian stratigraphic nomenclature in Kansas, in D. L. Baars, comp., Revision of Stratigraphic Nomenclature in Kansas: Kansas Geological Survey Bulletin 230, p. 67-74.
Merriam, D.F., 1963, The geologic history of Kansas: Kansas Geological Survey Bulletin, 162, 317 p
McCoy, J.R., 1978, Character of the Mississippian formation in south-central Kansas: Kansas Geological Survey, Open-File Report 78-9, 10 p.
McGinness, D.H., 1985, Hardtner Field, in P.M. Gerlach and T. Hansen, eds., Kansas Oil and Gas Fields, v. 5, p. 83-92.
Montgomery, S.L., J.C. Mullarkey, M.W. Longman, W.M. Colleary, and J.P. Rogers, 1998, Mississippian "Chat" reservoirs, south Kansas: Low-resistivity pay in a complex chert reservoir: American Association of Petroleum Geologist Bulletin, v. 82, p. 187-205.
Parham, K.D. and R.A. Northcutt, 1993, MS-3, Mississippian Chert and carbonate and basal Pennsylvanian sandstone Central Kansas uplift and northern Oklahoma, in D.G. Bebout, W.A. White, T.F. Hentz, and M.K. Grasmick, eds., Atlas of Major Mid-Continent Gas Reservoirs, Gas Research Institute, p. 57-60.
Peeler, J.A., 1985, Reservoir characterization of the Mississippian "Chat", Hardtner Field, Southern Barber County, Kansas, M.S. Thesis, Wichita State University, 120 p.
Rogers, J.P., M.W. Longman, and R.M. Lloyd, 1995, Spiculitic chert reservoir in Glick Field, South-central Kansas: The Mountain Geologist, v. 32, p. 1-22.
Rogers, S.M., 1996, Depositional and diagenetic history of the Mississippian Chat, North Central Oklahoma, M.S. Thesis, University of Oklahoma, 120 p.
Watney, W.L., Guy, W.J., And Byrnes, A.P., 2000, Characterization of the Mississippian chat in south-central Kansas, American Association of Petroleum Geologists Bulletin, v. 85, p. 85-113.
Zajic, W.E., 1956, Nichols pool, Kansas Geological Society, Kansas Oil and Gas Pools, vol. 1 (South Central Kansas), pp. 69-73.


Appreciation is extended to General Atlantic and Ocean Energy, Inc. for supporting the Petrofacies Project and providing considerable information on Spivey-Grabs Field. Jim Rogers is also thanked for providing encouragement on this project. Patricia Acker is thanked for graphic arts support.

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Last updated January 2003