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Toward the Origin of Long‐Period Long‐Duration Seismic Events during Hydraulic Fracturing Treatment: A Case Study in the Shale Play of Sichuan Basin, China

Chen, Haichao and Niu, Fenglin and Tang, Youcai and Tao, Kai (2018) Toward the Origin of Long‐Period Long‐Duration Seismic Events during Hydraulic Fracturing Treatment: A Case Study in the Shale Play of Sichuan Basin, China. Seismological Research Letters, 89 (3). pp. 1075-1083. ISSN 1938-2057. https://resolver.caltech.edu/CaltechAUTHORS:20180227-090442887

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Abstract

Long‐period long‐duration (LPLD) seismic events have been recently observed over several unconventional reservoirs, and are postulated to play a significant role in accommodating deformation within the stimulation zone. However, the origin of LPLD events is still under debate. In this study, we present observations of tremor‐like events during the multistage hydraulic fracturing treatment of a pilot horizontal well within the Weiyuan Shale play in southwestern Sichuan basin, China. These tremor‐like signals recorded by the deep downhole monitoring array (15 Hz geophones) resemble the previously reported LPLD examples in terms of both duration and frequency content. In this particular case, with the concurrent records from the surface broadband array, we however confirm that these signals are located well outside the treatment area, and most probably originate from regional earthquakes that occurred during the treatment course within 250 km radius of the treatment well, instead of local sources directly related to the hydraulic stimulation. This study implies that the attenuated signals of regional seismicity may constitute a particularly deceptive pitfall for identifying and misinterpreting LPLD events during hydraulic fracturing, especially in seismically active regions. Our results also highlight the importance of surface broadband array in monitoring hydraulic fracturing activities.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1785/0220170270DOIArticle
ORCID:
AuthorORCID
Chen, Haichao0000-0002-4689-7859
Niu, Fenglin0000-0002-4156-4780
Additional Information:© 2018 Seismological Society of America. Published Online 21 February 2018. Data and Resources: The China Earthquake Data Center was searched using data.earthquake.cn (last accessed September 2017). All the plots were made using the Generic Mapping Tools v.5.3.1 (http://gmt.soest.hawaii.edu, last accessed February 2017; Wessel et al., 2013). The waveforms used in this study were collected as part of the hydraulic fracturing monitoring experiment in Weiyuan Shale play. Data are available from the corresponding author upon request. The authors thank Sichuan Geophysical Company of China National Petroleum Company (CNPC) for providing the field dataset and permission to present this work, and Editor‐in‐Chief Zhigang Peng and two anonymous reviewers for their helpful comments. This work was jointly supported by the National Basic Research Program of China (973 Program, Number 2015CB250903), the National Natural Science Foundation of China (Numbers 41604043 and 41630209), and the Science Foundation of China University of Petroleum, Beijing (Numbers 2462014YJRC045 and 2462015YQ1203).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Basic Research Program of China2015CB250903
National Natural Science Foundation of China41604043
National Natural Science Foundation of China41630209
Science Foundation of China University of Petroleum2462014YJRC045
Science Foundation of China University of Petroleum2462015YQ1203
Issue or Number:3
Record Number:CaltechAUTHORS:20180227-090442887
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180227-090442887
Official Citation:Haichao Chen, Fenglin Niu, Youcai Tang, Kai Tao; Toward the Origin of Long‐Period Long‐Duration Seismic Events during Hydraulic Fracturing Treatment: A Case Study in the Shale Play of Sichuan Basin, China. Seismological Research Letters ; 89 (3): 1075–1083. doi: https://doi.org/10.1785/0220170270
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84969
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Feb 2018 18:52
Last Modified:09 Mar 2020 13:19

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