Kansas-type cyclothems and porosity development in Middle Pennsylvanian Marmaton Group, Dirks field, Logan County, Kansas
Seven depositional units are recognized in the Texaco 2 Dirks core (4374 to 4419.5 ft, 1333 to 1347 m) from the upper part of the Middle Pennsylvanian (Desmoinesian) Marmaton Group, Dirks field, Logan County, Kansas. These units make up two Kansas-type cyclothems, the Altamont and Lenapah, and record deposition in response to fluctuating sea level and differing terrigenous influx on the broad, epeiric shelf that was the northern extension of the Hugoton embayment. The units correspond to Heckel's basic, Kansas-type cyclothem members, which are (transgressive) middle limestone, (transgressive) core shale, (regressive) upper limestone, and (regressive) outside shale. The Altamont cyclothem lacks the core shale and perhaps the middle limestone, both of which are present in outcrops in eastern Kansas. The overlying Lenapah cyclothem contains all of the basic members of Heckel's Kansas-type cyclothem. The (transgressive) middle limestone of the Lenapah cyclothem is a relatively thin, locally burrowed, bioclast wackestone containing Osagia-coated bioclasts and a relatively diverse marine biota. Overlying this is calcareous, olive-gray to olive-black, fissile core shale containing phosphorite nodules and local brachiopods. Outside (regressive) shales in the Dirks 2 core are greenish to brownish gray. Porosity development in the Altamont and Lenapah cyclothems of the Dirks 2 is restricted to the upper limestone members. The Worland limestone displays intragranular, secondary moldic, solution-enlarged moldic, vuggy, and fracture porosity. Porosity and permeability are fair to good locally and are thought to reflect, for the most part, meteoric diagenesis related to subaerial exposure on a subtle Altamont high on the sea floor.
- Research Organization:
- Cities Service Research, Tulsa, OK
- OSTI ID:
- 6433356
- Report Number(s):
- CONF-8310309-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 67:8; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
FEDERAL REGION VII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
KANSAS
LITHOLOGY
MINERAL RESOURCES
NORTH AMERICA
OIL FIELDS
PALEOZOIC ERA
PENNSYLVANIAN PERIOD
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA