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GEOREF RECORD

Microseismic evidence for horizontal hydraulic fractures in the Marcellus Shale, southeastern West Virginia

Abdulgader A. Alalli and Mark D. Zoback
Microseismic evidence for horizontal hydraulic fractures in the Marcellus Shale, southeastern West Virginia (in Geomechanics, Yongyi Li (prefacer), Douglas Foster (prefacer), Marisela Sanchez-Nagel (prefacer), Mark Tingay (prefacer) and James Verdon (prefacer))
Leading Edge (Tulsa, OK) (May 2018) 37 (5): 356-361

Abstract

An integrated analysis of multistage hydraulic fracture stimulation done in three horizontal wells in the Marcellus Shale in southeastern West Virginia revealed that nearly half (14 out of 31) of the examined stages initiated horizontal hydraulic fractures. The study was performed in an area characterized by a transitional strike-slip/reverse faulting stress state where the maximum horizontal principal stress (SH (sub max) ) is oriented N55 degrees E. The stages that produced horizontal hydraulic fractures were all within the organic-rich Lower Marcellus Shale. Two lines of evidence indicate horizontal hydraulic fracture propagation. The measured least principal stress of those stages was of similar magnitude to the vertical stress (SV), indicating that the vertical stress and microseismic events are limited to a narrow horizontal layer and do not propagate vertically out of the Lower Marcellus Shale. Both lines of argument indicate that the vertical stress is the least principal stress, perhaps due to viscoplastic stress relaxation in the clay- and kerogen-rich Lower Marcellus Shale. In the 17 stages where perforations were placed in the stiffer Onondaga and Cherry Valley formations, the measured least principal stresses were less than the magnitude of SV, indicating that Sh (sub min) was the least principal stress. The microseismic data indicate vertical hydraulic fracture propagation, principally upward outside the Marcellus Shale. Significant gas was produced from the two wells with horizontal fractures in the organic-rich Lower Marcellus Shale, perhaps because twice as much proppant was used as in stages characterized by vertical fracture propagation.


ISSN: 1070-485X
EISSN: 1938-3789
Serial Title: Leading Edge (Tulsa, OK)
Serial Volume: 37
Serial Issue: 5
Title: Microseismic evidence for horizontal hydraulic fractures in the Marcellus Shale, southeastern West Virginia
Title: Geomechanics
Author(s): Alalli, Abdulgader A.Zoback, Mark D.
Author(s): Li, Yongyiprefacer
Author(s): Foster, Douglasprefacer
Author(s): Sanchez-Nagel, Mariselaprefacer
Author(s): Tingay, Markprefacer
Author(s): Verdon, Jamesprefacer
Affiliation: Stanford University, Department of Geophysics, Stanford, CA, United States
Affiliation: University of Texas at Austin, Austin, TX, United States
Pages: 356-361
Published: 201805
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 12
Accession Number: 2019-001787
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
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. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201903
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