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1 ARCO Technology and Operations Services, 2300 W. Plano Pkwy., Plano, Texas 75075; current address: BP Amoco Upstream Technology, 501 West Lake Park, Houston, Texas 77079; sye{at}mail.arco.com
2 Department of Geosciences, University of Tulsa, 600 S. College Ave., Tulsa, Oklahoma 74104
Liangmiao (Scott) Ye has been a senior reservoir geologist at ARCO technology center based in Plano, Texas, since 1997. He received a B.S. degree in petroleum exploration geology from the Jianghan Petroleum Institute, Hubei, China, in 1983, an M.S. degree in petroleum development geology from the Research Institute of Petroleum Exploration and Development (RIPED), Beijing, China, in 1988, and a Ph.D. in petroleum geosciences from the University of Tulsa in 1997. He worked for CNPC as a field engineer from 1983 to 1985 and as a development geologist from 1988 to 1993. His current interests include reservoir characterization and modeling, clastic sedimentology, and sequence stratigraphy.Dennis Kerr has been a faculty member of the Department of Geosciences at the University of Tulsa since 1991. He received a B.A. degree in geology at California State University at Fresno in 1974, and an M.S. degree in geology at San Diego State University in 1982. He also holds a Ph.D. in geology from the University of Wisconsin at Madison (1989). Dennis has worked in the petroleum industry in various capacities, including exploration, development, and research. His current research interests include clastic facies architecture and sequence stratigraphy.
The Middle Pennsylvanian Bartlesville sandstone, a prominent oil producer in Oklahoma over the past 90 yr, is evaluated in terms of its sequence stratigraphic architecture over its occurrence in northeastern Oklahoma. The Bartlesville sandstone is interpreted to be a fluvial-dominated incised-valley fill deposited mainly during rising stages of relative sea level.
The incised paleovalley, as defined by relief along the sub-Bartlesville type 1 sequence boundary, extends for over 140 mi (225 km) in a north-south direction through Oklahoma, and exhibits widths ranging from 6 mi (9.7 km) in the north to 60 mi (96.5 km) in the south. Thickness of the Bartlesville sandstone ranges from 140-280 ft (42.7-85.3 m) within the paleovalley to less than 20 ft (6.1 m) outside the paleovalley. The lower Bartlesville sandstone represents the lowstand systems tract and consists of braided-fluvial deposits. The upper Bartlesville sandstone represents the transgressive systems tract and is dominated by meandering fluvial facies that transition down the paleovalley and stratigraphically upward to estuarine facies. The regionally extensive Inola Limestone Member marker, capping the Bartlesville sandstone, is equivalent to a condensed section representing maximum flooding. The Bartlesville sandstone is regarded as representing an underfilled incised valley when compared to the early sequence stratigraphy paradigm as both the lowstand and transgressive systems tracts are filled within the valley.
Original oil in place (OOIP) and reservoir quality are incorporated into the sequence stratigraphic architecture. The lowstand systems tract, which contains about two-thirds of the OOIP for many of the Bartlesville sandstone fields and reservoirs, has been the primary target of development over the past century and is nearly depleted. The transgressive systems tract, much more heterogeneous and less developed by comparison, offers the main potential for future development.
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