Caney Shale, Arkoma Basin, Oklahoma

Forgotson, Jamas M.
Oklahoma University, Norman, OK

     The Caney Shale, Chesterian age, was deposited in the Oklahoma part of the Arkoma Basin one of a series of foreland basins that formed progressively westward along the Ouachita Fold Belt from the Black Warrior Basin in Mississippi to basins in southwest Texas. The Arkoma Basin in Oklahoma is in the Southeast corner of the state north and northwest of the Ouachita Mountains. The Caney thickens toward the southeast from 90' at its northwest edge to 220' along the Choctaw fault in the south. It can be subdivided into 6 intervals based on characteristics of the GR, density and resistivity logs. The Caney dips southward from a depth of 3000' in northern McIntosh County, Oklahoma to 12,000' just north of the Choctaw thrust. Reported average TOC values for the Caney Formation range from 5% to 8%. The TOC values range from 3% to 8% for different members of the Caney. The R0 values range from 1.7 at the northwest edge of the gas window to 3.4 just north of the Choctaw thrust. TOC values show linear correlation with density. Mud log gas shows have a strong correlation with desorbed gas values that range from 120 to 150 SCF/T. Estimates of GIP for the Caney range from 30 to 40 BCF/ section. Only one Caney completion reported an IP over 1000 Mcf/d. Other vertical completions have ranged from 50 to 100 Mcf/d. The Williams Layman 1-27 horizontal completion declined from an IP of 822 Mcf/d to 180 Mcf/d in one year and could produce at 80-100 Mcf/d for an extended period.

AAPG Search and Discovery Article #90071 © 2007 AAPG Rocky Mountain Meeting, Snowbird, Utah