... monitoring applied at HFTS2 include 1) native synchronization of five monitor arrays, 2) real-time location of microseismic events, 3) joint event- hypocenter/ velocity-model inversion that locates microseismic events simultaneously with constructing azimuthally anisotropic velocity models, 4) high...

... processing has a better chance to solve the difficult near-surface wave propagation issues [5]. The migration velocity model building is a crucial part of the depth migration and is often challenging. We tested the effect of including sonic logs and the usefulness of the ML estimated sonics in the model...

... in many North American unconventional shale plays (Rauch-Davies et al., 2018). Artificial Intelligence Reservoir Characterization information velocity model Prestack Depth Migration PSDM velocity field Velocity distribution velocity estimate application tomography topography shallow...

... seismic monitoring Marcellus Shale Midland Basin Wolfcamp shale unconventional resource technology conference deformation Kumar LPLD event harbert Texas Eagle Ford shale velocity model hammack current study URTeC: 564 Seismic Monitoring of Hydraulic Fracturing Activity in the Wolfcamp...

... sparse regional seismic networks that have a magnitude detection threshold that is generally greater than M 2.0. Eaton Earthquake Reservoir Characterization polarity Upstream Oil & Gas mechanism Fox Creek Alberta plane interpretation non-dc component velocity model moment-tensor...

...). Reservoir Characterization joint tomographic inversion URTeC velocity field residual moveout CIG velocity model FWI workflow inversion southwestern pennsylvania Upstream Oil & Gas iteration tomographic inversion marcellus imaging waynesburg hill area tomography geology Pennsylvania...

... velocity model is required to accurately locate microseismic events. An initial velocity model is usually built using a sonic log, and then calibrated using perforation shots with known locations. The calibration process involves identifying P-waves and/or S-waves generated by the perforation shots...

... for pure DC sources. frequency mechanism Reservoir Characterization orientation receiver angular coverage constraint Vavry�uk angular coverage velocity model source mechanism dominant source frequency synthetic seismogram tensor inversion Upstream Oil & Gas Source Orientation...

...URTeC: 2652022 Simultaneous inversion for microseismic event location and velocity model in Vaca Muerta Formation Zhishuai Zhang*, University of California, Berkeley; Jing Du, and Fuchun Gao, Total E&P R&T, Houston Copyright 2017, Unconventional Resources Technology Conference (URTeC) DOI 10.15530...

... hydraulic fracturing subtractive time-depth curve sonic log slippage microseismic event plane hybrid array Reservoir Characterization slip radius URTeC velocity model corner frequency dataset microseismic processing stress drop bedding slip layer depth Upstream Oil & Gas...

... depends on the quality and accuracy of the input parameters such as signal-to-noise ratio of the microseismic signal and the applied velocity model (e.g. Maxwell, 2014, Zimmer, 2011a, Zimmer, 2011b, Poliannikov, 2011, Poliannikov, 2015). In addition, other parameters such as the quality of the calibration...

... to attenuation of the higher frequencies, and the presence of different noise sources at the surface. Moreover, it is non-trivial to construct a velocity model which explains both sets of arrivals. In this paper, we introduce a technique aimed at jointly processing microseismic data recorded from both surface...

... mechanisms. The sampling of the radial array was superior, determining more hypocenters with higher accuracy and a better-constrained velocity model. The patch array appears to have been too sparsely spaced with many patches too far from the well. Patches located on the nodal plane also provided...

... in the current price environment and across a broader spectrum of wells. This is the first in a series of papers that will walk through the premise, basic steps and benefits to honoring an increasingly more sophisticated level of physics when building velocity models. The authors present a study of a West Texas...

... is related to the monitoring array configuration, data quality (e.g. signal-to-noise ratio) and the velocity model. In certain configurations, however, complex microseismic signals can be recorded when significant amplitudes of refracted or reflected waves interfere with direct arrivals. Such signal...

... and stimulation will likely be ineffective. If a lateral is landed in a dipping formation, but recorded acoustic emissions are processed assuming a flat velocity model, mapped events will be erroneously located. If a formation is naturally quiet but monitoring geophones are positioned in surrounding noisy rocks...

... was also developed for joint event location and velocity model calibration. Validation of the developed method was performed on perforation shots and shows that using head waves instead of polarization can achieve much better resolution in microseismic event location. The application of the developed...

... zone analysis. Upstream Oil & Gas observation well wave field anisotropic velocity model hydraulic fracturing treatment zone microseismic data shear-wave splitting Reservoir Characterization microseismic event operation travel time anisotropy microseismic monitoring velocity...

... fracturing Imaging noise Upstream Oil & Gas frac treatment image show Reservoir Characterization surface wave noise velocity model grid voxel fracture image activation time interval fracture spe-178637-m urtec time window fracture imaging method trace data Das , I. , and M...

.... The errors in the estimated travel times are primarily due to a combination of an uncertain velocity model and attenuation. Our examples demonstrate that the robust inversion of fluid flow parameters from microseismic data is possible if all effects contributing to uncertainty are properly accounted...