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Organic-rich Marcellus Shale lithofacies modeling and distribution pattern analysis in the Appalachian Basin

Guochang Wang and Timothy R. Carr
Organic-rich Marcellus Shale lithofacies modeling and distribution pattern analysis in the Appalachian Basin
AAPG Bulletin (December 2013) 97 (12): 2173-2205

Abstract

The Marcellus Shale is considered to be the largest unconventional shale-gas resource in United States. Two critical factors for unconventional shale reservoirs are the response of a unit to hydraulicfracture stimulation and gas content. The fracture attributes reflect the geomechanical properties of the rocks, which are partly related to rock mineralogy. The natural gas content ofa shale reservoir rock is strongly linked to organic matter content, measured by total organic carbon (TOC). A mudstone lithofacies is a vertically and laterally continuous zone with similar mineral composition, rock geomechanical properties and TOC content. Core, log data and seismic data were used to build a 3-D mudrock lithofacies model from core to multi-well and finally to regional scale. Artificial neural network (ANN) was used for lithofacies prediction. Eight petrophysical parameters derived from conventional logs were determined as critical inputs. Advanced logs, such as pulsed neutron spectroscopy (PNS), with log-determined mineral composition and TOC data were used to improve and confirm the quantitative relationship between conventional logs and lithofacies. Sequential indicator simulation performed well for 3-D modeling of Marcellus Shale lithofacies. The interplay of dilution by terrigenous detritus, organic matter productivity, and organic matter preservation and decomposition affected the distribution of Marcellus Shale lithofacies distribution which may be attributed to water depth and the distance to shoreline. The trend of normalized average gas production rate from horizontal wells supported our approach to modeling Marcellus Shale lithofacies. The proposed 3-D modeling approach may be helpful for optimizing the design of horizontal well trajectories and hydraulicfracture stimulation strategies


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 97
Serial Issue: 12
Title: Organic-rich Marcellus Shale lithofacies modeling and distribution pattern analysis in the Appalachian Basin
Affiliation: West Virginia University, Department of Geology and Geography, Morgantown, WV, United States
Pages: 2173-2205
Published: 201312
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 64
Accession Number: 2013-084001
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 tables, sketch maps
N40°30'00" - N45°00'00", W79°45'00" - W71°55'00"
N38°25'00" - N42°00'00", W84°49'60" - W80°31'60"
N39°43'00" - N42°17'60", W80°31'60" - W74°40'00"
N37°15'00" - N40°40'00", W82°30'00" - W77°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 201350
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