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- Title
Microseismic event location using an improved global grid search and its extended method in a downhole monitoring system.
- Authors
Mao, Qinghui; Wang, Peng; Azeem, Tahir
- Abstract
Precise and fast location of microseismic events plays an important role in the real-time hydro-fracturing monitoring. It provides an effective guidance to evaluate the fracturing effect, adjust the fracturing design and determine the exploitation scheme for low permeability and dense reservoir. However, currently used hypocenter location methods have some problems of either low accuracy or low efficiency especially in low signal to noise ratio (SNR) circumstances. So it is very difficult to meet the processing requirement for real-time monitoring during the hydro-fracturing operation. To solve this problem, we have developed an improved global grid search method, which simultaneously reduces the grid search range and step size upto its half until the search step size drops below a threshold during searching the optimal solution. Subsequently, this method is further extended by using back azimuth constraint and the objective function based on combination time difference in order to improve the location accuracy. The method has been successfully applied to synthetic data as well as on real microseismic data obtained from a single monitoring well which was acquired during a hydro-fracturing well stimulation. The synthetic and field data tests indicate that the proposed method is more feasible and robust than existing classical methods in low SNR circumstances. Furthermore, the proposed method may successfully find the events locations much faster and more accurately.
- Subjects
PETROLEUM reservoirs; MICROSEISMS; SIGNAL-to-noise ratio; PETROLEUM prospecting; ACOUSTIC emission; SEISMOLOGY
- Publication
Journal of Geophysics & Engineering, 2019, Vol 16, Issue 1, p159
- ISSN
1742-2132
- Publication type
Article
- DOI
10.1093/jge/gxy014