TY - JOUR

T1 - Downhole microseismic data interpretation for media anisotropy evaluation with limited acquisition geometry in Western Siberia

AU - Yaskevich, Sergey Vladimirovich

AU - Duchkov, Anton A.

AU - Kerusov, Igor N.

AU - Miroshnichenko, Dmitriy E.

AU - Loginov, Georgy N.

N1 - Publisher Copyright: © 2022 Society of Exploration Geophysicists and American Association of Petroleum Geologists.

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We have evaluated the results of processing and interpretation for one of the first projects in Russia for downhole microseismic monitoring of hydraulic fracturing in Western Siberia. The data are characterized by large distance to the acquisition array and noisy recordings. We illustrate that preliminary quality control of microseismic array installation is a useful tool that may predict some of the issues and help to promote better acquisition quality. Therefore, it is important to reiterate the significance of the supervision for microseismic field measurements, especially when the technology is tested in new regions. Despite limited acquisition aperture and a comparatively small number of observed microseismic events, it is possible to derive valuable interpretation results from the data set. The geometry of the event locations suggests significant unplanned development of the hydraulic fractures, including a significant shift of the fracture from the initiation point. Records with clear S-wave splitting allowed us to determine arrival times of P waves and two S waves for several microseismic events. Arrival times were then used for simultaneous kinematic inversion for microseismic-event location and anisotropic velocity-model update (layered transversely isotropic with the vertical axis of symmetry model). We estimate significant anisotropy from microseismic data. Thomsen parameters ϵ and γ are well constrained, whereas parameter δis constrained only for one of the layers.

AB - We have evaluated the results of processing and interpretation for one of the first projects in Russia for downhole microseismic monitoring of hydraulic fracturing in Western Siberia. The data are characterized by large distance to the acquisition array and noisy recordings. We illustrate that preliminary quality control of microseismic array installation is a useful tool that may predict some of the issues and help to promote better acquisition quality. Therefore, it is important to reiterate the significance of the supervision for microseismic field measurements, especially when the technology is tested in new regions. Despite limited acquisition aperture and a comparatively small number of observed microseismic events, it is possible to derive valuable interpretation results from the data set. The geometry of the event locations suggests significant unplanned development of the hydraulic fractures, including a significant shift of the fracture from the initiation point. Records with clear S-wave splitting allowed us to determine arrival times of P waves and two S waves for several microseismic events. Arrival times were then used for simultaneous kinematic inversion for microseismic-event location and anisotropic velocity-model update (layered transversely isotropic with the vertical axis of symmetry model). We estimate significant anisotropy from microseismic data. Thomsen parameters ϵ and γ are well constrained, whereas parameter δis constrained only for one of the layers.

KW - anisotropy

KW - hydraulic fracturing

KW - interferometry

KW - microseismic

KW - optimization

UR - http://www.scopus.com/inward/record.url?scp=85132206937&partnerID=8YFLogxK

U2 - 10.1190/INT-2021-0098.1

DO - 10.1190/INT-2021-0098.1

M3 - Article

AN - SCOPUS:85132206937

VL - 10

SP - T461-T468

JO - Interpretation

JF - Interpretation

SN - 2324-8858

IS - 3

ER -