A Local Equivalent Path Approach to Microseismic Source Location Using Surface Data
Y. Jiang, R. Wang, X. Chen and F. Wu
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: From Microseismic Data To Source Classification And Inversion
Publication date: 11 June 2018
Info: Extended abstract, PDF ( 731.29Kb )
Price: € 20
Microseismic monitoring has become a tool of choice for the development and optimization of oil and gas production from unconventional reservoirs. In contrast to down-hole arrays, the surface arrays provide greater coverage of the focal sphere and are not restricted by the difficulties in maintaining subsurface equipment. The ability to determine an accurate velocity model for the monitored area directly affects the accuracy of microseismic event locations. However, it is difficult to calibrate the velocity model with surface instruments. In this paper, we propose a new surface passive localization technique which utilizes the spatial distribution characteristics of propagation paths of perforation shot events and microseismic events to achieve rapid location through the local equivalent path approach. At the same time, this new method exploits perforation information to reduce the dependence on velocity model. We have tested the performance of the proposed technique on both synthetic and field data examples. The results suggest that, although the microseismic event is far from the perforation event (400 m), a reliable event location is achieved for layered models.