Stratigraphic framework and depositional systems of the Tackett, Morris, Glassey, and Lower Carpenter sands of Atoka Formation in the Arkoma Basin

The Tackett, Morris, Glassey, and Lower Carpenter sands are informally named units within the Arkoma Basin. The Tackett, Morris, and Glassey are Middle Atokan units and the Lower Carpenter is in the Upper Atoka. These units are fairly shallow units and have received little attention or study in the area of interest. Using net sand maps, well log signature, and cross-sections depositional systems were determined.; Within the study area the Tackett Sand is the result of a 4th order eustatic cycle superimposed on the 3rd order cycle of the Atoka. This allowed for incision of valleys and the subsequent valley fill. This is shown by the truncation of shale markers within the Tackett interval. The Morris Sand can be broken up into four separate sand units and is part of a progradational parasequence set. This was determined by well log signature and the net sand map. The depositional system of the Glassey Sand is either distributary channels or braided streams. This conclusion was made by using the blocky well log signature and the channelized net sand map. The Lower Carpenter Sand is distributary channels and interdistributary facies. The channelized net sand map and ratty well log signature were used to make this determination.; These four sand units have unique depositional histories and each tell a different geologic story. The understanding of these histories and stories will lead to a better understanding of Atokan deposition which in turn will advance the productivity of natural gas production in the Arkoma Basin.