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Keywords: inversion
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Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0426
... ABSTRACT: The brine sump at the bottom of a gas-storage cavern remains perennially colder than the rock mass at cavern depth, even a dozen years after cavern creation has been completed, resulting in an inversion of the temperature gradient in the lower half of the cavern in which convection...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0711
... a methodology for analysis of microseismic data through a novel "Time-Lapsed Microseismic" (TLM) technique combined with a Moment Tensor Inversion (MTI) method, to detect, locate and geomechanically characterize microseismic events in different time windows for monitoring the changes in the fracture network’s...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0695
... ABSTRACT: This study investigates the performance of yielding bolt in a weak rock mass tunnel with high in-situ stress conditions. The genetic algorithm and the Komamura-Huang rheological model are combined to perform an inversion analysis of the mechanical parameters of the weak surrounding...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1237
... of different depths; a physics-based machine-learning enabled flexural dispersion extraction algorithm that does not require zone-by-zone tuning of mud slowness, borehole size, and frequency filters; and a new inversion algorithm that jointly inverts the three Thomsen anisotropic parameters as well as mud...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1356
... formation pressure were inversed by using the formation rate analysis (FRA) method. The results indicated that the pumping modes have a great influence on the pressure response. The continuous withdrawal pumping mode produces the largest pressure drop, while the non-uniformly spaced withdrawal pumping mode...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1831
... ABSTRACT: An inversion scheme has been developed for automatic calibration of one-dimensional wellbore stability models. The scheme finds formation stress and strength parameters that produce the best agreement between observed and simulated geomechanics data. Such data includes the presence...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1170
... inversion tiltmeter data fracture dip inversion fracture single stage deformation fracture parameter ARMA 21 1170 Integrated Tiltmeter and Microseismic Fracture Mapping: A Revisit Peyman Moradi, Katie Jeziorski, Charlie Waltman and Doug Angus ESG Solutions, Kingston, ON, Canada Copyright 2021 ARMA...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2038
..., and velocity check-shots were used in the seismic inversion process to generate acoustic impedance. The acoustic impedance model is then converted into the velocity model from which effective stress can be calculated using the new correlation developed in this study based on Bowers equation and MDT data...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2078
... L 4.5) were identified. Events appear tightly clustered, both spatially and in depth. Focal mechanism analysis suggests that this region sits within a transitional stress regime, with a mixture of reverse and strike-slip faulting over a small spatial extent. Stress inversion of >70 focal...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1584
... to measure pore pressure in a natural gas field. Pore pressure variation changes the physical-geophysical properties of the rock, which can have an effect on seismic wave properties, therefore we can use seismic data to estimate pore pressure variation. A model based seismic inversion technique using wavelet...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0106
... density inversion MEQ machine learning hydraulic fracturing stimulation fluid pressure seismicity probability Artificial Intelligence Fluid Dynamics Earthquake genetic algorithm riffault Dempsey cloud 1 1. INTRODUCTION Hydraulic stimulation is applied to wells to improve formation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0447
... tomographic inversion method, the velocity fields in synthetic and natural rocks were determined. Upstream Oil & Gas specimen sensor ultrasonic velocity tomography velocity tomogram Reservoir Characterization propagation Applicability arrival time loading tomography hedayat barre...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1572
... in the geomechanical model to determine the conductivity of the natural fractures in the shale play. Reservoir Characterization Wellbore Design natural fracture Shale interval inversion wellbore integrity reservoir geomechanics criteria stiffness constant well 1 MPSI Upstream Oil & Gas regime...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1578
.... hydraulic fracturing Upstream Oil & Gas pore pressure reactivate Coulomb stress change Alberta Eaton geomechanics Reservoir Characterization Fox Creek mechanism operation Duvernay Formation fracture seismicity hydraulic fracture sequence seismicity event inversion interpretation 1...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-176
..., source hypocenter determinations, moment tensor inversion, and stress inversion. Results show that AE events were all triggered around the peak stress and that a large stress drop occurred. Through hypocenter location analysis, a spatial correspondence of AE clusters and the shear band imaged by CT scan...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-438
... velocity shallow gas colony algorithm experimental data inversion drilling operation sand body optimization problem shallow gas risk algorithm sediment longitudinal wave velocity 1. INTRODUCTION Offshore petroleum exploration and development in the proportion of global petroleum development...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-772
... channel AE monitoring system. The STC is a physical source, which describes anticipated fracture modes: shear-slip and opening/closing tensile crack. It is described by fewer parameters (5 instead of the 6 for MT), which is essential for solving the inverse problem. The presented STC procedure was tested...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1170
... complexity that is not fully revealed in a point source inversion. We develop a finite source inversion technique following Hartzell and Heaton, 1983 to compute the spatiotemporal distribution of slip during rupture of asperities and asperity clusters. First inversions of purely synthetic signals reveal some...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0453
... experiment length straight line fitting machine learning shale gas retardation time strain gauge inversion creep data extrapolation creep stress relaxation extrapolation parameter inverted fit quality power law 1. INTRODUCTION Shales may have diverse lithological composition, compaction level...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0733
... principal stress, s 1 , dips at 30-40° to the east and has a magnitude of 13-17 MPa. The magnitude of s 2 , is similar to s 3 , and lies in the range 8-10 MPa. Upstream Oil & Gas isotropic model stress solution reservoir geomechanics rms shear zone inversion MPa Reservoir Characterization...

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