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A Novel Array Acquisition and Processing Methodology for Microseismic Monitoring
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
Surface microseismic monitoring has converged on a few acquisition designs, notably the “star” and “patch” arrays, to detect and locate low signal-to-noise ratio (SNR) microseismic events. The principal ideas behind both these designs are the same: to be capable of attenuating surface noise and harnessing the power of stacking a large number of sensors to increase the SNR. We present an alternative acquisition design, consisting of hexagonal subarrays, and noise attenuation methodology that is easily scalable, adaptable to local site conditions, and cost effective. We propose this array design as it is easy to deploy in any environment since it does not require lines and each subarray has a very small footprint. In addition, we show that the hexagonal array is capable of removing coherent noise even with a limited number number of sensors through a semblance-weighted stack which attenuates surface wave noise while preserving the signal energy that arrives vertically. We demonstrate this capability through a pilot field test that co-located hexagonal arrays within a patch acquisition.