Reservoir framework and exploration potential of the Cleveland Formation (Western Anadarko Basin) using a sequence-stratigraphic model
- Univ. of Texas, Austin, TX (United States)
The Upper Pennsylvanian (lower Missourian) Cleveland Formation has yielded more than 435 bcf on natural gas and more than 18.2 MM bbl of oil from a seven-county tight-gas area in the northeastern Texas panhandle. Regional study of the Cleveland and underlying Desmoinesian Marmaton Group siliciclastics established the sequence-stratigraphic framework to clarify the vertical and areal occurrence of Cleveland reservoirs, seals, and source rocks. Regionally distinctive facies stacking patterns in the study interval compose a sequence-stratigraphic framework of several westerly sourced systems tracts and three depositional sequences. Sequence 1 (S1) is characterized by landward- and seaward-stepping deltaic/strand-plain cycles (parasequences) deposited on the top-of-Oswego type 1 sequence boundary. A relative sea level drop with the onset of S2 deposition initiated development of a sand-rich incised-valley system (LST:iv) in the middle Cleveland that extended basinward of the lower Cleveland shelf break. Subsequent coastal onlap by thin deltaic systems of the overlying TST marks the start of decreased sediment influx during late Cleveland deposition, resulting in thinning of parasequences and an increase in carbonate beds in upper S2 and S3. Stratigraphic traps and pinch out of reservoir facies within small, southeast-plunging anticlines compose most traps in the producing area. Proximal delta-front and fluvial sandstones of the Cleveland upper HST and overlying LST:iv, respectively, are the primary reservoirs. The high-TOC, top-of-Marmaton marine-condensed section and thick prodeltaic and lower distal delta-front shales within the lower Cleveland HST are the probable source rocks. Distal deltaic shales of the middle Cleveland TST form most reservoir seals. Potential new reservoirs should be targeted at the updip terminations of systems tracts, at lapout positions of individual sand-rich HST and TST parasequences, and along LST:iv valley-margin stratal terminations.
- OSTI ID:
- 7134710
- Report Number(s):
- CONF-9310237-; CODEN: AABUD2
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:9; Conference: American Association of Petroleum Geologists (AAPG) mid-continent section meeting, Amarillo, TX (United States), 10-12 Oct 1993; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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