The markerfree alignment is based on cross correlation methods and projection matching. We propose a crosshole imaging approach based on seismoelectric conversions sc associated with the transmission of seismic waves from seismic sources located in a borehole to receivers. High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face. These are the only types of cpr certification that meet this requirementfor track 2 applicants. This is a list of free and opensource software for geophysical data processing and. A computerized tomography ct scan combines a series of xray images taken from different angles around your body and uses computer processing to create cross sectional images slices of the bones, blood vessels and soft tissues inside your body. The only data files that the demo version can read are the data files included with the program set. A continuous vertical anomaly cannot be resolved at all using.
Fewer boreholes are needed to achieve a continuous picture of the subsurface thereby reducing overall costs and the risk of missing target features. Applicants to the computed tomography program are required to attend a recent. Cross hole seismic tomography which involves measuring travel times of seismic ray paths between two or more boreholes in order to derive an image of seismic velocities between the wells offers an. Tomoxpro is the only commercial crosshole software package in the seismic industry. Ct scan images provide moredetailed information than plain xrays do. Protomo is a software package used in electron tomography for markerfree alignment and 3d reconstruction of tilt series. Optical coherence tomography oct was first reported in 1991, as a noninvasive ocular imaging technology. There are many programs designed to view tomograms, and i have listed some of the more popular choices below particularly programs which can segment and visualize. Tarantola, 2005 that involves rays almost parallel which increase condition number of associated s matrix. An electric spark source set comprising energy storage power of. Breaking news, weather, analysis and information from the omaha worldherald about omaha events, local weather, sports, schools, crime, government, health and entertainment in. Deeplookcs crosswell seismic imaging service schlumberger.
This technique is used to create a display of formation properties such as acoustic velocity and attenuation, seismic reflectivity, or electromagnetic resistivity in the area between wells. Ultrasonic cross hole testing of deep foundations 3d imaging yury volkovoy and richard stain sonic coring or more properly ultra sonic cross hole logging is a common test for concrete foundations and has been since the late 1960s. A timing pulse accurate to better than a millisecond ensures accurate recording at crosshole distances of up to 250 ft. Pdi cross hole analyzer, find complete details about pdi cross hole analyzer,pile cross hole analyzer from other physical measuring instruments supplier or manufacturerearth products india pvt. A critical appraisal of asymptotic 3dto2d data transformation in full. Dec 18, 2014 pressuremeter testing, using an oyo elastmeter, was carried out in 5 boreholes between depths of about 4m to 60m below ground level typically below the tower footprint. Crosshole radar velocity tomography with finitefrequency fresnel. We developed new software for transmission electron tomography, tomoj. Crosshole seismic tomography which involves measuring travel times. Seismic tomography is a technique for imaging the subsurface of the earth with seismic waves produced by earthquakes or explosions. The casing of drill holes should not be conductive. Our systems support additional features such as automated robotic scanning, precision metrology, 4d scanning, and more. Tomographic data consists of firstbreak arrival times traveltimes for many combinations of source and receiver depths in two or more boreholes, with the scorpion sparker in one borehole and a receiver, typically.
Pile tomography delivers unmatched accuracy for defining the size, shape, severity and location of defects. Eidors electrical impedance and diffuse optical tomography reconstruction software provides software, algorithms and. The chum cross hole ultra sonic monitor uses the crosshole sonic logging csl method to perform highresolution quality control of deep foundations the system uses an ultra sonic wave sent from a transmitter to a receiver pulled through water filled access tubes embedded in the concrete. We propose a cross hole imaging approach based on seismoelectric conversions sc associated with the transmission of seismic waves from seismic sources located in a borehole to receivers. Geophysics at the borehole and crossborehole scale carole johnson, john lane and john williams ogwbranch of geophysics. Quantitative estimation of water storage and residence time in the epikarst with. Tomography definition of tomography by medical dictionary. Seismic tomography, crosshole, downhole geotomographie gmbh.
Weighing in at just under 15 pounds, the scorpion is highly portable, operates all day on a conventional automotive battery and functions in fresh water, seawater, or brackish water with no loss in performance. Sis offers inhouse 2d and 3d computed tomography software. We used an accelerometer with lat frequency response to. Crosshole or crosswell seismic measures the velocity of seismic waves between boreholes. This software package includes crosshole survey design, model building and modeling, data preprocessing, cdp transformation, tomography, waveequation. Over the years, the clinical applications of oct have dramatically improved in sensitivity and specificity. Seismic data can be sorted and edited and traveltimes can be determined. The application of vertical seismic profiling and crosshole. Velocity, reflection, and other sonic properties are measured to provide structural and physical characteristics in both the horizontal and vertical directions. Ultrasonic cross hole testing of deep foundations 3d imaging. Crosshole sonic logging eval uates the integrity of the con crete of drilled shafts and other. A ct scan or computed tomography scan formerly computerized axial tomography scan or cat scan makes use of computerprocessed combinations of many xray measurements taken from different angles to produce crosssectional tomographic images virtual slices of specific areas of a scanned object, allowing the user to see inside the object without cutting.
Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source. It is showed that pfm is a very effective tool in crosshole tomography signal processing, and is prospective for utilization in other realms of engineering. Our smooth inversion tomographic method is based on physically realistic modeling of. A tomogram is a series of 2d images, called slices which stack together to form a 3d image.
Based on the grid ray tracing and regularized inversion approach, xw tomo is capable of deriving the velocity structure among multiple vertical or deviated wells, while also allowing groundsurface variation. The crosshole sonic logging method is normally applied as a quality assurance qa technique for newly placed drilled shafts and auger cast piles, but can also be applied. Pdi crosshole analyzer buy pile crosshole analyzer. Borehole seismic methods largely fall into two categories, namely, crosshole seismics and seismic tomography. The one shop to purchase instrumentation solutions for land, sea and sparker technology. Crosshole tomography ct is a higher resolution analysis which can be used for further investigations after csl has detected a flaw. The program replaces an older tomography program, with significant advantages. Jeol usa offers tomography support that consists of three software packages. Seplib, seismic processing, stanford university, custom, crossplatform, fortran. The software is used to process seismic crosshole testing data obtained after astm4428 and to output results. Refs 1, 2 and 3 three or more tubes are cast into the concrete during construction so that a series of tests can be carried out between pairs of tubes, eg. The software analyzes wave speeds derived from arrival time data from the scans of all pairs of tubes to yield a wave speed map of the entire shaft volume. The nanotomography endstation on this beamline is designed for nanotomography with a spatial resolution down to 100 nm. Crosshole sonic logging csl is the most accurate and reliable technique for assessing the integrity of deep foundation elements constructed onsite from concrete or grout.
The geophysical tomography team crosshole resistivity. There are many programs designed to view tomograms, and i have listed some of the more popular choices below particularly programs which can segment and visualize the data. Terracon foundation and structural consulting professionals offer ndt testing of deep foundations using crosshole sonic logging csl, crosshole tomography ct. The program re places an older tomography program, with sgnificant advan tages. This software enables migratom to store arrays in extended xms. Tomoj is a plugin for the now standard image analysis and processing software for optical microscopy, imagej. Geotomographie, founded in 1999 in germany, provides complete solutions for borehole and nearsurface seismic surveys to geophysical, engineering and mining companies. It is possible to implement the deviation of the boreholes. This provides an initial indication of the amount of data within different sections of the profile and helps illustrate the resolution of the final model. Crosshole tomography provides a visual image of the distribution of various geo electrical parameters in a crosshole space which can be incorporated into the orebody modeling process.
Imaging with crosshole seismoelectric tomography request pdf. Tomography software for crosshole sonic logging csl data quality assurance for deep foundations what is tomography. The only data files that the demo version can read are the data files included with the. We design seismic borehole sources and receivers and develop specifically tailored software. The 3d ct wizard facility allows users to quickly set up and scan a component to obtain 3d ct data. Crosshole sonic logging csl is a method to verify the structural integrity of drilled shafts and other concrete piles the csl method is considered to be more accurate than sonic echo testing in the determination of structural soundness of concrete within the drilled shaft inside of the rebar cage. There are many types of tomography, and i work with one called electron tomography. The software package contains the result of 23 series of monte carlo calculations. Our software is customizable for any source trajectory e. Crosshole sonic logging evaluates the integrity of the concrete of drilled shafts and other bored or castinplace deep foundations. Tomography is a mathematical procedure that is applied to crosshole sonic logging csl data, providing the user with a visual image of a shafts internal defects. Seismic data inversion by crosshole tomography using geometrically uniform spatial coverage armando luis imhof1, carlos adolfo calvo2 and juan carlos santamarina3 recebido em 25 fevereiro, 2008 aceito em 18 abril, 2009 received on february 25, 2008.
Measurements from deeplookcs crosswell seismic imaging service bridge the gap between well logs and surface seismic measurements by collecting seismic data between two or more wells. Csl and ct analysis can eliminate the questions and concerns associated with problematic concrete pours. Sippi includes a reference cross hole gpr data from arrenaes set is also available, and will be used here to demonstrate the use of sippi to solve cross hole tomographic inversion in a probabilistic framework. Application of crosshole tomography for assessment of. Mvspsoft, borehole seismic data processing and interpretation, mohammed. Crosshole sonic logging csl and 3d tomography what is crosshole sonic logging csl csl integrity testing is performed by transmitting and receiving an ultrasonic signal between two parallel access tubes cast into a deep foundation element. Csl integrity testing allows an evaluation of concrete integrity and homogeneity within the shaft. Cross hole seismic tomography outline borehole seismic tomography involves the measurement of the travel times of seismic ray paths between two or more boreholes in order to derive an image of seismic velocity in the intervening ground. At the xray light source petra iii at the desy research center german electron synchrotron in hamburg, germany, the helmholtzzentrum geesthacht center for materials and coastal research hzg operates the imaging beamline p05. Our reconstruction processing engine is optimized for multicore processors, efficient memory access and low cost graphics processing card. This section contains examples for setting up and running an cross hole tomographic inversion using sippi using the reference data from arren. Crosshole seismic tomographic data and borehole logs were acquired in the median separating the east and west bound lanes of u. Seismic data processing software geotomographie gmbh.
Crosshole ultrasonic tomography and its application to karst. We have assessed the validity of 3dto2d data transformation in the context of crosshole seismic fullwaveform tomography by propagating 3d. Pdf application of crosshole seismic tomography in. The velocity between wells can be estimated with travel time. Pditomo is software developed to supplement champ output from csl tests. Cross borehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes. Crossborehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes. Computed tomography current cpr certification aha bls andor the cpraed for the professional rescuer card from the american red cross. Pditomo is a 3d tomography imaging tool that supplements the champ output. Crosshole seismic tomography geophysics seg library. Crosshole seismic tomography and borehole logging for. Crosshole ultrasonic tomography is referred to ray tracing by griding method and image reconstruction by combining the successively linearized iteration with damping leastsquares qr decomposition, with which the result has better precision than that with crosshole seismic tomography by using the same inversion method in engineering geological investigation. Crossholeradar velocity tomography is increasingly being used to.
Pditomo pile dynamics has released the new pdltomo software for analysis of crosshole sonic log ging csi data. Pile dynamics has released the new pditomo software for analysis of crosshole sonic logging csl data. The information obtained from crossborehole tomography, when properly interpreted in the context of all available information, can often be invaluable for preparing accurate geological cross sections for reservoir development and planning. First, the crosshole seismic tomography method eliminates.
Rayfract seismic refraction and borehole tomography software provides. Niftyrec is a software for tomographic reconstruction, providing the fastest gpuaccelerated reconstruction tools for emission and transmission computed tomography. Following picking the raw traveltime data is input into the modeling software and the ray coverage between displayed as a ray density profile right. P, s, and surface waves can be used for tomographic models of different resolutions based on seismic wavelength, wave source distance, and the seismograph array coverage. The information obtained from cross borehole tomography, when properly interpreted in the context of all available information, can often be invaluable for preparing accurate geological cross sections for reservoir development and planning. Crosshole seismic tomography which involves measuring travel times of seismic ray paths between two or more boreholes in order to derive an image of seismic velocities between the wells offers an. Aug 06, 2007 transmission electron tomography fills the gap between high resolution structural methods xray diffraction or nuclear magnetic resonance and optical microscopy. Trying to read any other data files will make the program exit.
A technique for measuring a signal that is broadcast from a transmitter or source located in one well, to a receiver array placed in a neighboring well. A powerful pattern filtering software has been developed by delphi tool, and batch signals can be more efficiently processed. Get the latest omaha news, sports and weather from team at ketv and find out why were omahas favorite news source. The problem here is that cross hole tomography is not a well posed problem because of the relative distribution of sources and receivers branham, 1990. Seismic methods can provide detailed information about rock properties and geological structure between boreholes. Jive3d, modeling and tomographic inversion, james hobro, university of. Seismic data inversion by crosshole tomography using.
Surveys by the crosshole radiowave method need a pair of drill holes. These model the conditions of exposure for a range of common makes of. Crossborehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two. Application of pattern filtering method in crosshole.