We have examined the amplitude ratio skkssks from two deep focus events recorded by the apt89 portable seismic experiment. Joint stochastic inversion of petrophysical logs and 3d pre. The result, shown on the right of figure 1, is surprising. Theory and method of seismic interferometry the theory behind interferometry is relatively straightforward to understand and apply. This book describes the theory and practice of seismic interferometry, with an.
Here, we discuss in more detail how we can combine the two correla tion products in. Seismic interferometry of these data involves only two simple steps. In surface acquisition, sensors are deployed on the surface in large twodimensional arrays, allowing this method to provide a greater accuracy in horizontal locations due to the wide aperture it can cover. An overview of microseismic acquisition project management. Inverting geodetic time series with a principal component. Optionally calculate and apply multiple components, including line, shot, receiver, cdp, and offset, as well as channel for marine applications. Heloise lynn specializes in the expression and use of anisotropy in multidimensional datasets multiazimuth, multicomponent, and time lapse, 3d azimuthal seismic acquisition design, azimuthal seismic processing, and azimuthal seismic interpretation. Microseismic monitoring has emerged as one of the top methods to confirm the effectiveness of stimulation activities in shale oil and gas plays. Ps inversion of dispersion curves 1 table of contents page 1.
Microseismic microseismic microseismic moment tensors. Microseismic interpretation is the monitoring of small scale microseismic signals made from either natural or man made tremors. Interferometric imaging of sparse data abstract 8 microseismicity can be used to monitor the migration of. Urtec 2461621 4 resulting shear force will be solely the projection of and and will be perpendicular to on the plane, 2.
The impact of velocity uncertainty on microseismic location and momenttensor inversion abstract with the rise of unconventional resources, microseismic monitoring is becoming increasingly important because of its costeffectiveness. Timewindowbased elastic wave interferometric imaging and weightedelasticwave wew interferometric imaging are proposed and used to locate modeled microseismic sources. Image enhancement through common reflection surface. The ones marked may be different from the article in the profile. Microseismic monitoring, by vladimir grechka and werner m. Nava, university of california, berkeley summary in this paper, we show that the location of microseismic events can be significantly improved by incorporating. Determination of event locations and magnitudes leads to estimations of the geometry of the fracture zone and certain dynamics of the fracturing.
To generate a dfn, we need to extract statistics on the orientation, size, spacing, and density of fractures from microseismic data. Other monitoring techniques often require drilling additional wells, but passive seismic does not. Case study using marcellus shale zhishuai zhang, james w. The two recorded signals from each source are crosscorrelated and the resulting crosscorrelograms are summed stacked.
Interferometry examines the general interference phenomena between pairs of signals in order. National geophysical research institute, a csir laboratory, uppal road, hyderabad 500007. Microseismic migration by semblanceweighted stacking and. Barnett shale operations achieve remote realtime microseismic interpretation with private and dedicated wireless networks case study. Seismology and slope stability in open pit mines dr r a lynch. The northwestern corner of the tarim basin hereinafter the noctb is surrounded by the pamir salient, the south tian shan mountains, and the tarim basin. Microseismic interferometry conference paper pdf available in the leading edge 3112. Most widely used to estimate stimulated reservoir volumes and in identifying major fault or fracture events for use in hydrocarbon exploration. Coseismic slip model of the 2008 wenchuan earthquake derived.
Microearthquake monitoring with sparselysampled data. Jan 25, 2017 the northwestern corner of the tarim basin hereinafter the noctb is surrounded by the pamir salient, the south tian shan mountains, and the tarim basin. Determining microseismic event locations by semblanceweighted stacking david w. Coseismic slip model of the 2008 wenchuan earthquake derived from joint inversion of interferometric synthetic aperture radar, gps, and field data. Nava, university of california, berkeley summary in this paper, we show that the location of microseismic events can. Joint stochastic inversion of petrophysical logs and 3d.
These are optimized for different types of data problem so that picking reliability is maintained as data quality changes. Optimal combination of insar and gps for measuring. Spwla 46th annual logging symposium, june 2629, 2005 a near angle seismic and extracted wavelet 616. Bodywave seismic interferometry applied to earthquake and storm. Identifying vertical productive fractures in the narraway. Controlledsource seismic interferometry, pioneered by schuster 2001, bakulin and calvert.
What moved where the impact of velocity uncertainty on. Image enhancement through common reflection surface stack. One critical input for a distinct element geomechanical model of hydraulic fracturing is the dfn. Determining maximum horizontal stress with microseismic focal. Optimal combination of insar and gps for measuring interseismic crustal deformation. Seismic interferometry involves the crosscorrelation of re.
The crustal deformation revealed by gps and insar in the. This cited by count includes citations to the following articles in scholar. The development of shale and tight sand resource plays over the past decade has dramatically changed the oil and gas industry. Scenario considers a 120 km 240 km planar fault with a. Improving microseismic event location accuracy with head wave. Influence of a velocity model and source frequency on. Discrete fracture network construction using microseismic. Seg releases microseismic monitoring by vladimir grechka and. Scenario considers a 120 km 240 km planar fault with a dip angle of 12, mimicking a portion of a megathrust. Geophysical institute, university of karlsruhe, 16, hertz strasse. Each trace is cross correlated with other input traces and is picked by multiple independent subalgorithms.
Pdf seismic interferometry involves the crosscorrelation of responses at different. Tutorial on seismic interferometry colorado school of mines. Microseismic migration by semblanceweighted stacking and interferometry task to accurately pick pwave arrival time on the noisy microseismic record. November 2011 while microseismic data have been used for decades for various applications including mineral mining, engineering, and gas and water storage, the use of microseismic monitoring for oil and gas production is a.
Reducing velocity model uncertainty and improving microseismic event location accuracy signature is the result of the expanding and subsequent. We integrated the gps and insar measurements to derive a largescale threedimensional. Identifying vertical productive fractures in the narraway gas. Leslie esg, canada abstract a volume of approximately x 1500 x m within the eastern wall of chuquicamata open pit mine is.
In conventional seismology, stacking is widely used to enhance signaltonoise ratio. The most common microseismic monitoring methods used in the industry today are by the use of surface arrays and downhole arrays. The narrative of the book follows the passage of seismic waves. Electronic journal of structural engineering 161 2016. Comparison of seismic interferometry techniques for the retrieval of. Seismic interferometry this is my almostcomplete draft of the book seismic interferomtery. Malovichko institute of mine seismology november 2010 abstract routine seismic monitoring in mines enables the quanti. Electronic journal of structural engineering 161 2016 39 fig.
Australian earthquake engineering society 2010 conference. Heigl, discusses how to process microseismic data, what can and cannot be inferred from such data, and to what level of certainty this might be possible. Determining microseismic event locations by semblance. To understand the entire picture, a microseismic geomechanics framework has been developed chorney et al. However, the recent business challenges faced by the petroleum industry have amplified the need for cost optimization. Seg releases microseismic monitoring by vladimir grechka. Iterativeinterferometrybasedmethodforpickingmicroseismic. Conceptually similar to spac, another way of using ambient noise is seismic interferometry schuster, 2001 schuster, 2009 wapenaar et al. Ps overview 1 table of contents page preface 2 overview 3 1. The tectonic settings of these three structures dominate the crustal deformation patterns and seismic events in the noctb and its adjacent regions.
Surfacebased, passive seismic monitoring is the environmentally conscientious way to monitor well treatments. A path to understanding frac growth m icroseismic monitoring is a valuable tool in understanding the effi cacy of hydraulic fracture treatments. Knowledge of the locations of seismic sources is critical for microseismic monitoring. Cablefree land seismic data acquisition cables have always been seen as a necessary evil when it comes to seismic surveys, but the good news is that the burdens created by cables may soon be a thing of the past s tarting with the very. Basic geophysics, seismic fundamentals and 3d seismic. Seismic interferometry university of utahs tomography and.
The innovative recording system allows our crews to utilize the most advanced technology to transmit data in the most. Mastt solution algorithm derives the s, g, c, and a vectors. Following schuster 2001, the essentials of seismic inter ferometry. Seismology and slope stability in open pit mines dr. Coseismic slip model of the 2008 wenchuan earthquake. Identifying vertical productive fractures in the narraway gas field using the envelope of seismic anisotropy dragana todorovicmarinic1, glenn larson2, david gray1, greg soule2, ye zheng 1,jean pelletier2 1veritas dgc, calgary, alberta, canada, 2devon.
Application of joint seismic event location techniques at chuquicamata open pit mine, chile ci. Tutorial on seismic interferometry semantic scholar. Improving microseismic event location accuracy with head wave arrival time. Influence of a velocity model and source frequency on microseismic waveforms. I am willing to give a 1day seismic interferometry short course including matlab exercises to any utam sponsor, which includes matlab exercises. Ambient noise seismic interferometry performed by crosscorrelation has been proven to be a potential. International symposium on stability of rock slopes in open pit mining and civil engineering richard lynch page 377 installed into holes inclined beyond 2 from vertical, 14 hz omnidirectional geophones are used for the long 100300 m inclined boreholes. Expediting field operations and improving collaboration for accurate decision making inefficient microseismic data transmission. In the past decade, the boom of stimulation and production from the unconventional reservoirs have made microseismic monitoring a commonly used technology in the petroleum industry.
He has previously worked at schlumberger, cggveritas, and most recently with sensor geophysical ltd. An anomaly in the amplitude ratio of skkssks in the range. Seismic interferometry seismic interferometry is an exciting new. Sdcon surface consistent deconvolution sdcon is a surface consistent deconvolution algorithm. Unfortunately, the vast supply together with other external factors. Basic geophysics, seismic fundamentals and 3d seismic exploration by r. Identifying vertical productive fractures in the narraway gas field using the envelope of seismic anisotropy dragana todorovicmarinic1, glenn larson2, david gray1, greg soule2, ye zheng 1,jean pelletier2 1veritas dgc, calgary, alberta, canada, 2devon canada corp. Australian earthquake engineering society 2010 conference perth, western australia routine microseismic monitoring in mines aleksander j. Comparison of surface and downhole microseismic acquisition. About the authors jason hendrick is a geophysicist with nexen energy ulc, focused on the development of north american unconventional resources dr.
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