Geology of the Mary Lee Group of coalbeds, Black Warrior coal basin, Alabama. [21 refs. ; appendices]
Technical Report
·
OSTI ID:7318732
A geologic study of the Mary Lee Group of coalbeds in the Black Warrior coal basin was undertaken to examine coal stratigraphy and determine regional trends and extent of the coalbeds. The area investigated encompasses 835 square miles in Jefferson, Walker, and Tuscaloosa Counties, Ala. More than 700 core logs were used to construct a structure map, coal, interval, and overburden isopachs, and cross sections. There is evidence that structure affected sedimentation. Coalbed isopachs indicate the Mary Lee Group was deposited in fluvial-deltaic and low-lying coastal plain environments. The Mary Lee coalbed is the only coalbed that is continuous throughout the area, commonly with two benches that have a combined thickness of 2 to 12 ft. The Mary Lee coalbed changes rank in the basin from high- through medium- to low-volatile coal. The methane gas potential of the Mary Lee Group coals is estimated to be greater than 1 trillion cu. ft. There is an excellent correlation between the orientation of surface cleats with those measured underground in the Mary Lee coalbed. The face cleats roughly parallel the axes of the area's folds and trend northeast-southwest.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA). Pittsburgh Mining and Safety Research Center
- OSTI ID:
- 7318732
- Report Number(s):
- BM-RI-8189
- Country of Publication:
- United States
- Language:
- English
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