Paper ID: 8699

Borehole Microseismic Imaging of Hydraulic Fracturing: A Pilot Study on a Coal Bed Methane Reservoir in Indonesia

Rexha Verdhora Ry1, Tepy Septyana2, Sri Widiyantoro1, Andri Dian Nugraha1 & Arii Ardjuna3

1Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha No 10 Bandung, West Java, Indonesia, 12330

2BP Indonesia

3SKK Migas Indonesia

Email: rexha.vry@gmail.com

 

Abstract

Since the past few decades, microseismic monitoring has begun to be a considerable technology in the geophysical community due to its capability to image stimulated hydraulic fractures in the development of unconventional hydrocarbon resources. As a pilot study in Indonesia, hydraulic-fracturing treatments were operated at a coal-bed methane (CBM) field to stimulate the flow and increase the reservoir's permeability, while the monitoring system was set up in a single near-vertical borehole. Locating event sources accurately is fundamental to investigate the induced fractures, but, the geometry of single downhole array implicates a challenging data processing, especially to remove ambiguity in source locations. We review the locating procedure consisting of 3 main steps: (i) accurate picking for P- and S-wave phases, (ii) inclusion of P-waves particle motion in estimation of the back azimuth, and (iii) guided inversion process for hypocenter determination. Furthermore, the seismic-source moment magnitudes were calculated by employing the Brune’s model. We have successfully yielded reliable solutions of locations as shown statistically by uncertainty ellipsoids and small misfit. Based on our results, both induced and triggered seismicity could be observed during the treatments and, therefore, conducting intensive monitoring is important. The triggered seismicity is an undesired activity so that it requires huge concerns for disaster precautions, in particular for preventing any reactivation of pre-existing faults.

Keywords: downhole receivers; fracture stimulation; induced seismicity; microseismic.

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