Monitoring hydraulic fracturing with seismic emission volume

Fenglin Niu1,2, Youcai Tang3, Haichao Chen4, Kai TAO3 and Alan Levander5, (1)China University of Petroleum, State Key Laboratory of Petroleum Resources and Prospecting, and Unconventional Natural Gas Institute, Beijing, China, (2)University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, (3)China University of Petroleum, State Key Laboratory of Petroleum Resource and Prospecting, and Unconventional Natural Gas Institute, Beijing, China, (4)China University of Petroleum at Beijing, Unconventional Petroleum Research Institute, and State Key Laboratory of Petroleum Resource and Prospecting, Beijing, China, (5)Rice University, Earth, Environmental and Planetary Sciences, Houston, United States
Abstract:
Recent developments in horizontal drilling and hydraulic fracturing have made it possible to access the reservoirs that are not available for massive production in the past. Hydraulic fracturing is designed to enhance rock permeability and reservoir drainage through the creation of fracture networks. Microseismic monitoring has been proven to be an effective and valuable technology to image hydraulic fracture geometry. Based on data acquisition, seismic monitoring techniques have been divided into two categories: downhole and surface monitoring. Surface monitoring is challenging because of the extremely low signal-to-noise ratio of the raw data. We applied the techniques used in earthquake seismology and developed an integrated monitoring system for mapping hydraulic fractures. The system consists of 20 to 30 state-of-the-art broadband seismographs, which are generally about hundreds times more sensible than regular geophones. We have conducted two experiments in two basins with very different geology and formation mechanism in China. In each case, we observed clear microseismic events, which may correspond to the induced seismicity directly associated with fracturing and the triggered ones at pre-existing faults. However, the magnitude of these events is generally larger than magnitude -1, approximately one to two magnitudes larger than those detected by downhole instruments. Spectrum-frequency analysis of the continuous surface recordings indicated high seismic energy associated with injection stages. The seismic energy can be back-projected to a volume that surrounds each injection stage. Imaging seismic emission volume (SEV) appears to be an effective way to map the stimulated reservior volume, as well as natural fractures.
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