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Element cycling in the Middle-Late Triassic Shublik Formation: Mineralization vs. recycling of biolimiting nutrients in an unconventional resource play Element cycling in the Middle-Late Triassic Shublik Formation: Mineralization vs. recycling of biolimiting nutrients in an unconventional resource play
The Triassic Shublik Formation in northern Alaska is one of the major source rocks in North America, having generated much of the petroleum in Prudhoe Bay and associated fields. The middle Shublik Formation, the focus of this study, is a highly phosphatic, organic-rich carbonate mudstone interval. Apatite cements can occur as phosphatic peloids, steinkerns, elongate or angular nodules...
Authors
Katherine J. Whidden, Julie A. Dumoulin, James Macquaker, Justin E. Birdwell, Adam Boehlke, Katherine L. French
Implications of aggregating daily production data on estimates of ultimate recovery from horizontal hydraulically fractured Bakken oil wells Implications of aggregating daily production data on estimates of ultimate recovery from horizontal hydraulically fractured Bakken oil wells
The level to which data are aggregated can impact analytical and predictive modeling results. In this short paper we discuss some of our findings regarding the impacts of data aggregation on estimating change points in the production profiles of horizontal hydraulically fractured Bakken oil wells. Change points occur when production transitions from one flow regime to another. Change...
Authors
T. C. Coburn, Emil D. Attanasi
Status and trends of pelagic prey fish in Lake Huron, 2018 Status and trends of pelagic prey fish in Lake Huron, 2018
Scientists from the U.S. Geological Survey’s Great Lakes Science Center conducted integrated acoustic and mid-water trawl surveys of Lake Huron annually from 2004-2018. The 2018 survey was conducted during September and included transects in Lake Huron’s main basin, Georgian Bay, and North Channel. Mean lake-wide pelagic fish density was 1532 fish/ha and mean pelagic fish biomass was...
Authors
Timothy P. O’Brien, Steve A. Farha, David Warner, Peter C. Esselman, Kristy Phillips, Steven Lenart, Chris Olds
Scale-specific metrics for adaptive generalization and geomorphic classification of stream features Scale-specific metrics for adaptive generalization and geomorphic classification of stream features
The Richardson plot has been used to illustrate fractal dimension of naturally occurring landscape features that are sensitive to changes in scale or resolution, such as coastlines and river channels. The Richardson method estimates the length of a path by traversing (i.e., “walking”) the path with a specific stride length. Fractal dimension is determined as the slope of the Richardson...
Authors
Larry Stanislawski, Barbara P. Buttenfield, Barry J. Kronenfeld, Ethan J. Shavers
Proposed multi-period response spectra and ground motion requirements of the 2020 Recommended Provisions and ASCE 7-22 Proposed multi-period response spectra and ground motion requirements of the 2020 Recommended Provisions and ASCE 7-22
This paper summarizes a comprehensive set of proposals to the Provisions Update Committee of the Building Seismic Safety Council that would incorporate multi-period response spectra (MPRS) in the 2020 edition of the NEHRP Recommended Seismic Provisions for New Buildings and Other Structures (2020 NEHRP Provisions) and related proposals to the ASCE 7-22 Seismic Subcommittee of the...
Authors
Charles A Kircher, Sanaz Rezaeian, Nico Luco
Stream corridor sources of suspended sediment and phosphorus from an agricultural tributary to the Great Lakes Stream corridor sources of suspended sediment and phosphorus from an agricultural tributary to the Great Lakes
Fine-grained sediment and phosphorous are major contaminants in the Great Lakes and their tributaries. Plum Creek, Wisconsin (92 km2), a tributary to the Lower Fox River, has a Total Maximum Daily Load (TMDL) requiring reductions of suspended sediment and phosphorus loading by 70% and 77%, respectively. In 2016-18, an integrated sediment fingerprinting and stream corridor-based sediment...
Authors
Faith A. Fitzpatrick, James D. Blount, Leah Kammel, David L. Hoover, Allen C. Gellis, Barbara C. Scudder Eikenberry