... The velocity model in downhole microseismic monitoring plays a vital role in accurate mapping of the hydraulic fracturing image, but the conventional velocity optimization method by the perforation shot introduces non-negligible event location errors when the geological formations are complex...

... Unconventional shale reservoirs can act as waveguides if their velocity is lower than their surroundings. Using DAS, we can record such guided waves as unaliased signals originating from both cross-well perforation shots and microseismic events. When S-type guided waves propagate through...

... for monitoring the zipper hydraulic fracturing in 3 horizontal wells in the target formation. We built an anisotropic velocity model by joint inversion of an anisotropic velocity model with about 100 evenly distributed microseismic events as well as about 20 perforation shots in one of the horizontal wells. We...

... receiver exploration geophysicist 10 artificial intelligence microseismic event velocity model upstream oil & gas hti medium perforation shot inversion seg international exposition event location media machine learning bayesian inversion microseismic data processing experiment...

... frequency production control log analysis horizontal part reservoir characterization production monitoring annual meeting das observation receiver perforation shot resolution References References Binder , G. , A. Titov , D. Monk , G. Byerley , J. Simmons...

... processed the waveforms from perforation shots so that SV-wave arrival times can be picked in addition to Pand SH-wave arrival times. This makes the inversion wellconstrained by reducing the number of model parameters while increasing the number of observations. We applied both Maximum A posteriori (MAP...

... ABSTRACT We provide well-calibrated VTI velocity models useful to locate microseismic events in the Vaca Muerta shale formation, Neuquén, Argentina. Assuming layered models with weak anisotropy, we make use of the information provided by well logs and perforation shots of known position...

... ABSTRACT This study integrates the traveltime measured from microseismic perforation shots and walkaway vertical seismic profiling (VSP) in a global optimization scheme. The walkaway VSP provides the intermediate receiver emergent angles, which are crucial to extract anisotropic parameter...

... ABSTRACT When locating microseismic events using conventional travel time picking methods, one or more velocity models can be required. The models are optimized using available calibration data, such as perforation shots, stringshots, or ball seat events. When a model cannot correctly predict...

... model is usually initially created from the sonic logging curves, then the layer velocity values are calibrated by the perforation shot or string shot data while the depths of layers are fixed. To avoid possible errors caused by wrong layer-depths in the initial velocity model from the sonic logging...

... for the microseismic applications may be large because of limited information from sources such as perforation shots. To solve the above problems, we develop a time domain approach for event detection and location, in which we first scan a RMS velocity using the perforation shot event, which may not be clearly seen...

... ABSTRACT We present a simple method to calculate the zero time of perforation shots which is valid when the horizontal offset/vertical offset ratio between the shots and receivers is small. We applied this method to a field data acquired in Bakken shale. The results show a variation of the P...

.... In addition, S-waves can be initiated by perforation shots. All of these elastic sources can be used for imaging and analyses. A major advancement in seismic sensing has developed on the receiver end by using fiber-optic sensors. These sensors are largely sensitive to strains in their axial direction...

... detection real time system seg seg international exposition monitoring north sea noise microseismic monitoring perforation shot microseismic event slowness projection filter advanced noise removal method upstream oil & gas reservoir characterization injection seismic interference real...

... Date: Monday, October 17, 2016 Start Time: 3:45:00 PM Location: 144/145 Presentation Type: ORAL seg seg international exposition reservoir characterization perforation shot geophysics relative location upstream oil & gas slave event equation 1 velocity model multiple master...

.... The accuracy of the approach with a real world example is validated by quality-control of the imaging procedure, by the relative position to a treatment well of the event locations, and by the match of the imaged perforation shot to its known location. Introduction Passive seismic data recorded by surface...

... upstream oil & gas hypocenter traveltime static correction geophysics slave velocity model microseismic event reservoir characterization relative eventlocation ray cervený surface microseismic relative location microseismic monitoring perforation shot event location accuracy...

... event as well as perforation shot location in a project in Marcellus shale. Comparison with location results provided by contractor shows that the developed method can effectively improve the accuracy of microseismic event location. Based on the improvement, we propose a new acquisition geometry...

... characterization hydraulic fracturing velocity change reduction beroza template threshold multiplet separation stanford university ray path barnett shale detect velocity change utilization perforation shot earthquake geophysical research upstream oil & gas waveform Utilization...

... Summary For accurately locating microseismic events, it is crucial to have an accurate velocity model. A common way to determine the velocity model is to use the grid search method to find the optimal model to fit the arrival times from perforation shots. However, the accuracy of the velocity...