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Testing of a permanent orbital surface source and distributed acoustic sensing for monitoring of unconventional reservoirs; preliminary results from the Eagle Ford Shale

Feng Cheng, Julia Correa, Shan Dou, Barry Freifeld, Todd Wood, Kurt Nihei, Dante Guerra, Jens Birkholzer, Benxin Chi and Jonathan Ajo-Franklin
Testing of a permanent orbital surface source and distributed acoustic sensing for monitoring of unconventional reservoirs; preliminary results from the Eagle Ford Shale
Geophysics (February 2021) 86 (2): P1-P12

Abstract

The effective monitoring of hydraulic fracturing in unconventional oil and gas production requires tools to quantify elastic property variations even in the absence of microseismic activity. To track the subtle time-lapse variations in reservoir properties during such activities, monitoring techniques with high repeatability and high resolution, spatially and temporally, are required. Distributed acoustic sensing (DAS) is a rapidly maturing fiber-optic technology for low-cost, permanent, high density, in-well monitoring. Surface orbital vibrators (SOVs) are inexpensive fixed rotary seismic sources that offer the opportunity to frequently interrogate the subsurface with energies comparable to vibroseis sources. We have evaluated a field vertical seismic profile test, conducted in the Eagle Ford play, pairing an SOV source recorded by DAS behind casing in a deviated well to better evaluate the potential of the technology set for unconventional reservoir monitoring. We determine the data processing workflow for reservoir monitoring using the SOV-DAS system. We analyze the data characteristics of the SOV-DAS system, including the signal-to-noise ratio characteristics and source repeatability. High-quality P- and S-wave reflections, as well as mode conversions, are visible in the vertical section. In addition, clear P-P reflections are also observable along the horizontal well sections. Time shifts with a mean value of 10 mu s between different data sets demonstrate the high repeatability for the semipermanent SOV source, which is crucial for time-lapse analysis. We also apply reflection imaging on P and S to reveal reflection depths. In a first-of-its-kind deployment, we implemented a rotating SOV with a slewing bearing and discuss the possibility to optimize S-wave construction along the horizontal well with specific SOV orientation directions. Our preliminary results indicate that the combination of repeatable surface sources such as SOVs with DAS has significant potential for providing a low-cost approach for high-resolution seismic monitoring of unconventional reservoirs.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 86
Serial Issue: 2
Title: Testing of a permanent orbital surface source and distributed acoustic sensing for monitoring of unconventional reservoirs; preliminary results from the Eagle Ford Shale
Affiliation: Rice University, Department of Earth, Environmental and Planetary Sciences, Houston, TX, United States
Pages: P1-P12
Published: 202102
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 48
Accession Number: 2021-022948
Categories: Applied geophysicsEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N30°15'00" - N30°45'00", W97°00'00" - W96°15'00"
Secondary Affiliation: Lawrence Berkeley National Laboratory, USA, United StatesTexas A&M University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, 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: 2021
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