... Multi-stage, multi-well completions cause pore-pressures to increase around each stage treated, compound from earlier offset treatment stages, then dissipate as the injected fluid leaks off into the rock formation. Local stress changes illuminated by microseismic focal mechanisms can be used...

... Stress inversion is a challenging task. The data describing the stress field normally includes either direct in-situ measurements in the wellbore, or indirect data – focal mechanisms of microearthquakes in the area of interest. Joint inversion of the source mechanisms and various types...

... Moment tensors of kinematically double-couple microseismic events triggered in anisotropic formations are known to exhibit non-double-couple focal mechanisms. Their weak anisotropy approximation reveals the combinations of anisotropy coefficients of vertically transversely isotropic focal...

... tightly clustered, both spatially and in depth, and appear to be related to a southern boundary fault of the Fort St. John Graben complex. Stress inversion of a number of focal mechanisms suggests that the maximum principal stress is well constrained and almost horizontal, however the intermediate...

... ABSTRACT During hydraulic fracturing, focal mechanisms of microseismic events often exhibit a near-horizontal nodal plane. Previous studies have pointed out that this type of focal mechanism is consistent with stick-slip behavior on relatively weak bedding planes, adjacent to expanding...

..., and the relationship between microseismicity and hydraulic / natural fractures. We show that stress inversion with event focal mechanisms could help us better interpret microseismicity by identifying slip direction, and the true fault plane on which it occurs. We present a field case study in the Vaca Muerta formation...

... of the direct P-wave. By classifying the best double-couple solutions of the retrieved moment tensors, three groups of distinct focal mechanisms were identified, of which two have predominantly double-couple source mechanisms. The moment tensors of group three exhibit significant non-double-couple components...

... pressure distribution at the basement faults, in this study we estimate the pore pressure distribution around the basement faults using well constrained focal mechanisms. Assuming Coulomb faulting theory and welldefined tectonic stress field, we mapped the spatiotemporal pore pressure distribution from...

...-earthquake distribution can be used to map active faults. We also determined the focal mechanisms of the two events in March 2010, both of which are consistent with a right-lateral strike-slip fault. These two events occurred within two months after a peak of wastewater injection and are probably induced...

... in this paper. Then micro-seismic wave field and illumination characteristics were analyzed and results show that both focal mechanisms and medium types will affect the micro-seismic event radiation pattern and there are many differences among different cases, which could be used for focal mechanism or fracture...

... Presentation Type: ORAL seismic source fracture vavrycuk microseismic data geophysics tensor inversion tensor mti reservoir characterization focal mechanism geometry mechanism grechka seg seg international exposition tensile microseismic event vladimir grechka plane microseismic event...

... and characteristics of rock breaking. In this study, the procedure of hydraulic fracturing is simulated by using a Longmaxi shale sample. After the end of the hydrofracturing, hundreds of acoustic emission (AE) events are recorded during the process of stress unloading. Then the focal mechanism of shale failure...

... by two monitoring wells only. When an event was recorded only on a single monitoring well the moment tensor inversion has to be further constrained (Vavry uk, 2007) to deviatoric moment tensors. Tectonic stress can be determined from the shear components of focal mechanisms by several inversion methods...

... is to evaluate the impacts of key aspects of surface processing workflow including detection criteria and focal-mechanism handling. Introduction Surface mapping of microseismic events induced by hydraulic fracturing provides information as to the mapped network’s length, height, orientation, and focal...

...Fast elastic full waveform inversion for microseismic location and focal mechanism Xiong Zhang*1,2, Jie Zhang1, Mark D. Zoback2 1University of Science & Technology of China (USTC), 2Stanford University Summary A fast elastic full waveform inversion method is developed to simultaneously find...

... fracture microseismic event marc grausem amplitude geophone surface array borehole array reservoir characterization focal mechanism hydraulic fracturing upstream oil & gas fluid-filled fracture radiation pattern hydraulic fracture s-wave attenuation factor observation well Inferring...

... for a phase-squared scanning algorithm. algorithm focal mechanism reservoir characterization snr false trigger upstream oil & gas candidate event event detection correlated noise single channel snr threshold value noise detection root-n behavior channel count polarity attenuation...

... upstream oil & gas hydraulic fracturing mechanism seismic consistency tensor variability fault plane solution orientation focal mechanism microseismic event reservoir characterization frohlich fracture complexity Assessment of hydraulic fracture complexity and stress field variability...

... search result microseismic event microseismic search engine upstream oil & gas receiver velocity model search engine focal mechanism event location search technology potential microseismic event magnitude database reservoir characterization information management waveform seg...

... of source locations under our study conditions. We plan to apply the method to locate microseismicity in oil-gas reservoir areas. acquisition geometry image time small earthquake reservoir characterization resolution test amplitude seismic source earthquake focal mechanism gorge reservoir...