Abstract: In the time-lapse approach, passive geophysical methods are also applied. Microearthquake monitoring has been carried out in the shale gas production. Fracking of shale gas layers could generate microearthquakes. The hypocenter distribution and focal mechanism give the information on the fracture location and the stress field during the fracking process. Finding sweet spots for the best oil recovery from the shale gas layers is one of important tasks to be done. Anisotropy affects the errors on hypocenter determination. The seismic interferometry method has been used for the imaging of deformed regions and the temporal changes in the subsurface. Passive seismic signals generated by microearthquakes, traffic noise, human activities, and wind and weather changes can be used for the time-lapse analysis of Accurately Controlled and Routinely Operated Signal System (ACROSS) measurements. The data of passive seismic signals are obtained by separating the spectral lines of background noise from those of ACROSS signals.
Publication Year: 2017
Publication Date: 2017-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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