Petroleum Plays and Systems in the National Petroleum Reserve - Alaska

The North Slope of Alaska has re-emerged as one of the most active exploration provinces in the United States. Recent exploration successes, economic benefits of applying innovative exploration and production technologies, evolving industry demographics, rising oil and natural gas prices, and the anticipation that North Slope natural gas resources may become economically viable and marketable through a planned pipeline have stimulated a renewed intensity in leasing and exploration activity. The focus of NPRA exploration appears to include both structural and stratigraphic objectives that may include strata spanning much of the stratigraphic column. The purpose of the core workshop is to prove an opportunity to examine a large collection of core from all major stratigraphic units present in NPRA. The chapters in this volume provide a current perspective on the genesis and petroleum potential of each stratigraphic interval.
Lithofacies and Depositional Environments of the Permo-Triassic Sadlerochit Group in the National Petroleum Reserve-Alaska (NPRA) Available to Purchase
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Published:January 01, 2001
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CitationGregory C. Wilson, Beverly A. Burns, Joseph H. McGowen, Robert S. Tye, Jerry H. Veldhuis, 2001. "Lithofacies and Depositional Environments of the Permo-Triassic Sadlerochit Group in the National Petroleum Reserve-Alaska (NPRA)", Petroleum Plays and Systems in the National Petroleum Reserve - Alaska, David W. Houseknecht
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Abstract
The Permo-Triassic Sadlerochit Group is divided, in ascending order, into the Echooka Formation, Kavik Shale, Ivishak Sandstone, and Fire Creek Formation in the National Pertroleum Reserve-Alaska (NPRA). It pinches out near the Barrow area in the north and thickens to at least 2250 ft (685 m) in the Tunalik 1 well 100 miles to the southwest. The base is defined by the pre-Echooka unconformity, a transgressive surface of erosion developed on the Carboniferous Lisburne Group (Jamison et al., 1980). During a regional north-to-south regression, the Kavik Shale and Ivishak Sandstone were deposited. In general, they are characterized as an upward-shoaling succession of prodelta/shelfal mudstones to proximal deltaic, intertidal, and fluvial deposits. The Fire Creek Sandstone records an abandonment or transgression of the proximal, non-marine facies of the Ivishak Sandstone and return to fully marine depositional conditions. This work subdivides the Sadlerochit Group into lithofacies that characterize the wide range of depositional environments. The primary focus is on the Ivishak Sandstone cored in the JW Dalton, Drew Point, and East Simpson 1 wells.