Clay-mineral diagenesis in rocks of Morrowan and Springeran age, Anadarko basin, Oklahoma - relationship to time-temperature history

Conference · Fri May 01 04:00:00 EDT 1987 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:5866611

Pollastro, R M; Schmoker, J W

Whole-rock and clay mineralogies of shales and sandstones of Morrowan and Springeran age (Lower Pennsylvanian) were determined by x-ray powder diffraction from core samples from 14 wells constituting a profile across the Anadarko basin. Interstratified illite/smectite (I/S) clay is the most abundant clay mineral in the shales; I/S is less abundant than other clay minerals in sandstones, unless the sandstones are clay mottled or contain shale laminae. The sandstones and shales commonly contain randomly interstratified I/S at present depths down to about 10,000 ft (3050 m). Below 11,000 ft (3350 m), only ordered I/S is present. Regional mean random vitrinite-reflectance profiles for the Anadarko basin, compiled from the literature, suggest erosional removal of at least 2600 ft (800 m) of sediment. Assuming a geothermal gradient of 1.3/sup 0/F/100 ft and a surface temperature of 65/sup 0/F (18/sup 0/C) at the time of maximum burial (about 60 Ma), the transition from randomly interstratified I/S to short-range ordered I/S for the Morrowan-Springeran interval corresponds to a maximum burial temperature of 230/sup 0/-245/sup 0/F (110/sup 0/-115/sup 0/C). This temperature range is in good agreement with clay-mineral temperature stability models for this I/S transition, which have been published for younger rocks. Time-temperature reconstructions using Lopatin's method relate the clay-mineral diagenesis documented in this study to thermal history and stages of hydrocarbon generation in the Anadarko basin and provide insight into the importance of time relative to temperature in the burial diagenesis of clay minerals.

• Research Organization: Geological Survey, Denver, CO
• OSTI ID: 5866611
• Report Number(s): CONF-870606-
• Conference Information: Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CLAYS
DIAGENESIS
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
MATURATION
MINERAL RESOURCES
NORTH AMERICA
OKLAHOMA
PALEOZOIC ERA
PENNSYLVANIAN PERIOD
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SHALES
USA