Drowned barrier bar and tidal inlet sequences in Buckner-Sesser-Valier fields, Franklin County, Illinois
Nearly 400 electric logs, using spontaneous potential and resisitivity curves, were analyzed in a study of the Aux Vases Formation in the Buckner-Sesser-Valier fields of Franklin County, Illinois. Subsurface mapping procedures incorporated data from core descriptions, scout tickets, and electric logs in constructing structure maps on marker beds directly above and below the formation, and isopachs of producing and nonproducing sandstones within the formation. Three lithofacies were recognized in the Aux Vases Formation; in ascending order they are: Facies A, a thin, nonproductive calcareous sandstone with a southwest-northeast sand body orientation; Facies B, a low permeability, rippled, 0 to 25 ft (8 m) thick, glauconitic sand also oriented in a southwest-northeast direction, and Facies C, a high-angle (20/sup 0/ to 30/sup 0/) cross-bedded, permeable, producing sand oriented in a northwest-southeast direction ranging from 0 to 18 ft (5 m) thick. Oil producing tidal channel-tidal delta sands show evidence of migration to the north based on (1) a wedge-shaped isopach thickening to the north across the width of the channel, (2) a slight bowing to the northeast in reaction to longshore currents, and (3) isolated fossil-hash lime bodies paralleling the long direction of the channels to the north, representing fill in deposits of the last position of the channel that was inundated by a transgressive sea.
- Research Organization:
- Southern Illinois Univ., Carbondale
- OSTI ID:
- 6828203
- Report Number(s):
- CONF-8310301-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 67:9; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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