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Interrelationships of Marcellus Shale gas production to frac-induced microseismicity, interpreted minor faults and fractures zones, and stimulated reservoir volume, Greene County, Pennsylvania

Thomas H. Wilson, Ariel K. Hart and Pete Sullivan
Interrelationships of Marcellus Shale gas production to frac-induced microseismicity, interpreted minor faults and fractures zones, and stimulated reservoir volume, Greene County, Pennsylvania
Interpretation (Tulsa) (February 2016) 4 (1): T15-T30

Abstract

The data we analyzed are from a Marcellus Shale gas field in Greene County, southwestern Pennsylvania. We first investigated the relationship between microseismic event trends and discontinuities extracted from 3D seismic data and their relationship to S (sub Hmax) . This analysis was followed by an examination of the relationship of cumulative gas production to radiated energy, stimulated reservoir volume (SRV), and energy density (ED). We have determined that microseismic event trends observed in multiwell hydraulic fracture treatments were similar to the trends of interpreted small faults and fracture zones extracted from 3D seismic coverage of the area. Hydraulic fracture treatments conducted in six laterals produced clusters of microseismic events with an average trend of N51 degrees E and, to a more limited extent, N56 degrees W. The N51 degrees E microseismic event trend coincided closely with the average N52 degrees E trend of interpreted minor faults and fracture zones extracted from the 3D seismic data. That relationship suggested that microseismic events form through reactivation of old faults and fracture zones in response to an easterly trending S (sub Hmax) . We also found that variations in gas production correlated with variations in radiated microseismic energy (R (super 2) of 0.985), SRV (R (super 2) of 0.974), and ED (R (super 2) of 0.989). SRV is a measure of the volume of space occupied by induced microseismicity, whereas energy release per unit volume (ED) can be directly related to rupture area created through hydraulic fracture stimulation. We suggest that ED serves as a better estimator of production potential in unconventional shale reservoirs.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 4
Serial Issue: 1
Title: Interrelationships of Marcellus Shale gas production to frac-induced microseismicity, interpreted minor faults and fractures zones, and stimulated reservoir volume, Greene County, Pennsylvania
Affiliation: West Virginia University, Morgantown, WV, United States
Pages: T15-T30
Published: 201602
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 51
Accession Number: 2016-007638
Categories: Economic geology, geology of energy sourcesStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 tables, sketch maps
N37°00'00" - N40°00'00", W83°00'00" - W78°00'00"
Secondary Affiliation: EOG Resources, USA, United StatesEnergy Corporation of America, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201604
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