The objective of this study is to characterize cross-well fracture growth and aseismic closure during hydraulic fracturing using a combination of distributed fiber optic sensing methods. Data obtained from low-frequency distributed acoustic sensing (LF-DAS) and Brillouin-based distributed strain sensing (DSS) were analyzed to calculate cumulative aperture changes during and after stimulation. The results show that both LFDAS and DSS detected the same level of aperture changes after one stage of hydraulic fracturing; while the LF-DAS measurement showed greater sensitivity to strain changes and higher S/N, the DSS measurement provide a consistent view of absolute strain. The cumulative aperture change estimated from LF-DAS and DSS is around 1957 µm and 1180 µm for stage 5 and stage 7.

Keywords:
sedimentary rock, geologist, unconventional play, mudrock, production logging, reservoir geomechanics, geology, rock type, petroleum play type, hydraulic fracture aperture estimation
Subjects:
Hydraulic Fracturing, Well & Reservoir Surveillance and Monitoring, Unconventional and Complex Reservoirs, Production logging
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