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Marcellus fracture characterization using P-wave azimuthal velocity attributes; comparison with production and outcrop data

Tanya L. Inks, Terry Engelder, Edward Jenner, Bruce Golob, Jacki S. Hocum and Darien G. O'Brien
Marcellus fracture characterization using P-wave azimuthal velocity attributes; comparison with production and outcrop data (in Geoscience follow-up papers from URTeC 2013 and 2014, Anonymous)
Interpretation (Tulsa) (August 2015) 3 (3): SU1-SU15

Abstract

Analysis of two 3D surveys, available well data, published outcrop data and subsurface information, as well as production data available from the state of Pennsylvania, demonstrates that wide-azimuth seismic is sensitive to variations in fracturing at the scale of individual pads or even individual wells. These variations in fracturing begin to explain why production varies significantly, even locally, within the Marcellus Shale gas play. Rose diagrams from quantitative fracture analysis using azimuthal seismic velocity volumes were compared with published data from Appalachian black shale outcrops and subsurface fracture models proposed in various papers to validate the results from subsurface data. These analyses provided insight into the rock fabric and the presence of systematic joints that likely affect production. There was a strong correlation between the low anisotropy and low heterogeneity of anisotropy and high estimated ultimate recovery (EUR). Additionally, interpreted fracture trend azimuths differed between areas of larger gas EUR and areas of smaller gas EUR as defined by decline curve analysis. Some perforations were likely to perform much better than others along the borehole, based on observed heterogeneity in the seismic profiles and map view.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 3
Title: Marcellus fracture characterization using P-wave azimuthal velocity attributes; comparison with production and outcrop data
Title: Geoscience follow-up papers from URTeC 2013 and 2014
Affiliation: IS Interpretation Services, Denver, CO, United States
Pages: SU1-SU15
Published: 201508
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 23
Accession Number: 2015-073886
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sects.
N33°00'00" - N47°30'00", W87°00'00" - W67°00'00"
Secondary Affiliation: Pennsylvania State University, Department of Geosciences, USA, United StatesION GXT, USA, United StatesSolutions Engineering, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, 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: 201532
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