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GEOREF RECORD

Mesozoic rift basins onshore North Carolina and south-central Virginia, USA, Deep River and Dan River; Danville total petroleum systems and assessment units for continuous gas accumulation, and the Cumberland-Marlboro "Basin," North Carolina

Jeffrey C. Reid
Mesozoic rift basins onshore North Carolina and south-central Virginia, USA, Deep River and Dan River; Danville total petroleum systems and assessment units for continuous gas accumulation, and the Cumberland-Marlboro "Basin," North Carolina (in Petroleum systems in 'rift' basins, Paul J. Post (editor), James Coleman (editor), Norman C. Rosen (editor), David E. Brown (editor), Tina Roberts-Ashby (editor), Peter Kahn (editor) and Mark Rowan (editor))
Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference (December 2015) 34: 287-305

Abstract

Two continuous gas assessment units (AU's) are present in the Late Triassic (Norian) onshore rift basins of North Carolina and south-central Virginia. Continuous AU's are the USGS classification/nomenclature for the oil and gas rich resource plays industry has been pursuing and exploiting throughout the continental United States. 'Continuous gas assessment units' include tight gas sandstone as well as two resource plays--coal-bed methane and shale gas/oil. The USGS assessed the East Coast Mesozoic rift basins as continuous gas AU's primarily as tight gas AU's because oil and gas have been found (although not produced) from tight (i.e., low porosity and permeability) sandstones, coal beds, and shale beds/intervals. The source rocks are lacustrine shales that were deposited in freshwater lakes that were near the paleo-equator after the onset of Pangea rifting. These two rift basins, the Deep River basin wholly within North Carolina, and the Dan River-Danville basin, located in north-central North Carolina and south-central Virginia have been assessed numerically as part of the USGS's National Petroleum Resource Assessment (Fig. 1). The name "Dan River-Danville basin" is used by the U.S. Geological Assessment team for assessment, and the name, "Dan River basin" is used herein following stratigraphic revision and formal basin naming in 2015 (Olsen et al., 2015). These two rift basins are part of a series of larger continental series rift basins that formed during the Permian to Early Jurassic extension in central Pangea as the supercontinent began to fragment. These continuous gas-prone AUs each have a single total petroleum system (TPS). The Deep River basin continuous AU has an estimated mean gas content of 1,660 billion cubic feet of gas (BCFG) and an estimated mean of 83 million barrels of natural gas liquids (MMBNGL). Noble gases have been documented from two shut-in wells in the Deep River basin by the North Carolina Geological Survey in a separate study (Reid et al., 2015c). The Dan River-Danville basin continuous AU has an estimated mean gas content 49 BCFG and no natural gas liquids from data available in 2011 assessed by the U.S. Geological Survey (Milici et al., 2012) (Table 1). The Dan River basin stratigraphy has been clarified by Olsen et al. (2015). A continuous 1,477-footdeep stratigraphic core hole drilled in 2015 by the North Carolina Geological Survey penetrated a 323-ft-thick unconventional lacustrine shale reservoir containing a 3-ft-thick coal having gas shows in the coal and lower siltstone and then drilled through an underlying siliciclastic formation containing previously unknown thin organic strata, to basement at a depth of 1,451.2 ft below the surface. The Cumberland-Marlboro "basin," a large, strike-parallel and seaward negative aeromagnetic anomaly that is buried beneath thin unconsolidated coastal plain sediments, also was drilled and cored (three Rotasonic holes) in 2015 by the North Carolina Geological Survey. Metasedimentary Paleozoic(?) basement rock was recovered; no Triassic strata were present. Additional information that accompanies this extended abstract is found in Appendices 1-3.


ISSN: 1544-2462
Serial Title: Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference
Serial Volume: 34
Title: Mesozoic rift basins onshore North Carolina and south-central Virginia, USA, Deep River and Dan River; Danville total petroleum systems and assessment units for continuous gas accumulation, and the Cumberland-Marlboro "Basin," North Carolina
Title: Petroleum systems in 'rift' basins
Author(s): Reid, Jeffrey C.
Author(s): Post, Paul J.editor
Author(s): Coleman, James, Jr.editor
Author(s): Rosen, Norman C.editor
Author(s): Brown, David E.editor
Author(s): Roberts-Ashby, Tinaeditor
Author(s): Kahn, Petereditor
Author(s): Rowan, Markeditor
Affiliation: North Carolina Geological Survey, Raleigh, NC, United States
Affiliation: Bureau of Ocean Energy Management, New Orleans, LA, United States
Pages: 287-305
Published: 20151201
Text Language: English
Publisher: Society of Economic Paleontologists, Gulf Coast Section (GCSSEPM) Foundation, Houston, TX, United States
ISBN: 978-1-944966-00-3
Meeting name: 34th GCSSEPM Foundation Bob F. Perkins-Rosen research conference on Petroleum systems in 'rift' basins
Meeting location: Houston, TX, USA, United States
Meeting date: 20151213Dec. 13-16, 2015
References: 52
Accession Number: 2020-013069
Categories: Economic geology, geology of energy sources
Document Type: Serial Conference document
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 1 table, geol. sketch map
N34°00'00" - N42°00'00", W79°00'00" - W71°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 202009
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