Terracon foundation and structural consulting professionals offer ndt testing of deep foundations using cross hole sonic logging csl, cross hole tomography ct and sonic echoimpulse response seir methods. The movement of a saline tracer through fracture zones can be monitored by borehole radar. This software package includes crosshole survey design, model building and modeling, data preprocessing, cdp transformation, tomography, waveequation. Divine can handle data from all the major service companies and borehole tools. We developed new software for transmission electron tomography, tomoj. Volvicon is an advanced application for reconstruction of computed tomography ct, magnetic resonance mr, ultrasound, and xrays images. Divine, microseismic processing, vsp, reflection and crosshole.
Established in 1972, pdi continues to innovate, develop, manufacture and supply stateoftheart qaqc testing and monitoring products and. Whereas in conventional crosswell surveying there is only a single raypath considered for each shot, in tomography multiple raypaths are measured for each shot. Crosshole tomography ct and sonic echoimpulse response seir methods. Watanabe and sassa 1996 used 24, single component, 40hz natural frequency geophones to survey two sites in the kamioka mine in japan. Subterraseis leverages this experience to offer turnkey data acquisition, processing, interpretation and consulting services to companies operating in the energy, geothermal, mining and engineering sectors. The chum cross hole ultrasonic monitor uses the cross hole sonic logging csl method to perform highresolution quality control of deep foundations. Seismic tomography, crosshole, downhole geotomographie gmbh. It is very convenient to build up noise measurement and observation. Our proprietary 3d imaging products are used by ct and microct scanner manufacturers and endusers of ct scanners to improve image quality, reduce or eliminate artifacts, accelerate image. In terms of geophysical surveys capital surveys have expertise in cavities and utilities investigation, geophysical expertise includes electrical resistivity tomography ert, ground penetration radar gpr services, electromagnetic em surveying, cross hole and down hole tomography, multichannel analysis of surface waves data acquisition begins with meticulous survey planning. The smooth inversion tomographic method is based on physically meaningful modelling of seismic first break energy refraction, transmission and diffraction. Solutions for borehole and nearsurface seismic surveys. Crosshole ultrasonic tomography and its application to.
Transmission electron tomography fills the gap between high resolution structural methods xray diffraction or nuclear magnetic resonance and optical microscopy. Tomography is imaging by sections or sectioning, through the use of any kind of penetrating wave. Specifically, landtech employs new, hightech methods for oil and gas exploration and. Dhp8501 digital hydrophone digital hydrophone is a new kind of acoustic single collection equipment, which join hydrophone with amplification modulation circuit, collection, storage and digital data transfer. The crosshole tomography study was continued using two imaging plane depths of 6m and 10m. We neither outsource our work to a third party, nor do we perform with tools and equipment hired or borrowed from a third party. Grl operates the largest dynamic pile testing firm in the world, as well as an industry leading provider of integrity test methods for deep foundations including thermal integrity profiling, crosshole sonic logging, and low strain integrity testing. To date, there are papers available that have been dedicated to the results of the application of crosshole seismic tomography to an efficiency assessment of soil stabilization actions 20,21 as well as to the experience of applications of crosshole seismic tomography in the assessment of the continuity of artificial retaining structures of.
Application of crosshole tomography for assessment of. Tomoj is a plugin for the now standard image analysis and processing software for optical microscopy, imagej. Landtech was the first company to apply passive seismic services to the oil industry since its establishment in 1998 and has become the leader in high resolution 3d passive seismic tomography surveys worldwide. Drilled shafts are prepared for i ntegrity testing by csl during their construction by installation of at least three tubes with a minimum inside diameter of 38mm 1. Our proprietary 3d imaging products are used by ct and microct scanner manufacturers and endusers of ct scanners to improve image quality, reduce or eliminate artifacts, accelerate image reconstruction, and decrease scan time. Pdf application of crosshole seismic tomography in. The system uses an ultrasonic wave sent from a transmitter to a receiver pulled through water filled access tubes embedded in the concrete. There are many types of tomography, and i work with one called electron tomography. Geotomographie, founded in 1999 in germany, provides complete solutions for borehole and nearsurface seismic surveys to geophysical, engineering and mining companies. 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. Bandwidth analyzer pack bap is designed to help you better understand your network, plan for various contingencies, and track down problems when they do occur.
Sales, rentals of seismic sources, receivers and processing software, training and support. 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. Laboratory study of the crosshole resistivity tomography. The results of the borehole deviation measurements were used to determine the distance between boreholes at depth, which in turn facilitated the reduction and interpretation of cross hole seismic velocity survey data and the interpretation of the cross hole seismic tomography data. Our asset includes all tools and equipment necessary for our day to day operations. Pdf the crosshole sonic logging csl measurement system to. Our systems support additional features such as automated robotic scanning, precision metrology, 4d scanning, and more. It gives features for exporting 3d surfaces or volume as triangular mesh files for creating physical models using 3d printing technologies. 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. The results of the borehole deviation measurements were used to determine the distance between boreholes at depth, which in turn facilitated the reduction and interpretation of crosshole seismic velocity survey data and the interpretation of the crosshole seismic tomography data. Markerfree image registration of electron tomography tiltseries. Geotomcg is a 2d3d tomographic inversion program for traveltime and amplitude data sets. Csl tests are performed using the most recent equipment and analysis software manufactured by pdi, inc. The company has its origin in manufacturing xray tubes that are at the heart of all xrf equipment.
In addition, ndt professionals are involved in numerous. Sorzano co, messaoudi c, eibauer m, bilbaocastro jr, hegerl r, nickell s, marco s, carazo jm. Chum cross hole ultrasonic monitor chum supports the crosshole sonic logging. Divine microseismic and seismic tomographic imaging software. Borehole seismic methods largely fall into two categories, namely. Assessing drilled shaft integrity with crosshole sonic logging. The conventional approach involves lowering a 3component borehole geophone down one hole while lowering a source down an adjacent hole s, firing the source at some prescribed depth interval. Pdf seismic crosshole tomography has been commonly used in oil and gas exploration and the mining industry for the detection of precious resources find. Csl, crosshole sonic logging, sonic logging or sonic coring method for high resolution testing of piles of any diameter and size.
Our reconstruction processing engine is optimized for multicore processors, efficient memory access and low cost graphics processing card. T keeps consistently up to date and continuously invested in hardware upgrades, software and, most of all, human resources. The crosshole sonic logging csl measurement system to. Seismic data processing software geotomographie gmbh. Digital cable can be 70 meters, standard usd interface, easy to connect with computer system. The crosshole sonic logging measurement to measure the quality of bored piles is presented in this paper. Pdf the potential of seismic crosshole tomography for. This allows sippi to work on for example cross hole. Developing, manufacturing and marketing of deep foundations quality assurance ndt equipment for pile testing. Which is the best software for 3d reconstruction from ct. We design seismic borehole sources and receivers and develop specifically tailored software.
Pditomo tomographic software is available for superior tomographic results providing intuitive 3d identification of questionable areas, as well as allowing for a quick and easy quantitative, comprehensive, engineering analysis. Csl, cross hole sonic logging, sonic logging or sonic coring method for high resolution testing of piles of any diameter and size. Extreme sensitivity of crosshole electrical resistivity. Our software is customizable for any source trajectory e. 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. The chum cross hole ultrasonic monitor uses the crosshole sonic logging csl method to perform highresolution quality control of deep foundations. The markerfree alignment is based on crosscorrelation methods and projection matching. To date, there are papers available that have been dedicated to the results of the application of cross hole seismic tomography to an efficiency assessment of soil stabilization actions 20,21 as well as to the experience of applications of cross hole seismic tomography in the assessment of the continuity of artificial retaining structures of. It also includes the refinement of geometric parameters of the tilt series. Crosshole seismic tomography which involves measuring travel times.
Crosshole ultrasonic tomography and its application to karst. In additiony one 24channel borehole seismic hydrophone array strexmer will be placd in we2 hbor54, and the second streamer vii be placed in well htfbi to record the pressure data. This method was concluded to be a useful tool for blast damage assessment. Seismic methods can provide detailed information about rock properties and geological structure between boreholes. Fewer boreholes are needed to achieve a continuous picture of the subsurface thereby reducing overall costs and the risk of missing target features.
In the built environment engineered surfaces or infrastructure e. A new technology for oil field characterization article pdf available in geophysics 143 january 1995 with 171 reads how we measure reads. 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. Crosshole or crosswell seismic measures the velocity of seismic waves between boreholes. 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 only data files that the demo version can read are the data files included with the.
For all the plots the range of righthand midpoint depths is 5 15, and the lefthand midpoint depth is fixed at. It allows the preprocessing, registration of tilt series before performing 3d reconstructions. Reflexw software, according to selected module, covers complete range of wave data seismic, gpr, ultrasound and their processing through different geometry assembling such as refraction seismic, reflection seismic, surface investigations and borehole. 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. Having conducted deep foundation testing on more than 28,000 lineal feet of drilled shafts throughout the united states, we have the experience to deliver quality data. List of tomography companies, manufacturers and suppliers. The data received at seismometers are used to solve an inverse problem, wherein the.
Protomo is a software package used in electron tomography for markerfree alignment and 3d reconstruction of tilt series. A tomogram is a series of 2d images, called slices which stack together to form a 3d image. 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. The cross hole tomography study was continued using two imaging plane depths of 6m and 10m. Established in 1972, pdi continues to innovate, develop, manufacture and supply stateoftheart qaqc testing and monitoring products and software for the deep foundations industry.
Sis offers inhouse 2d and 3d computed tomography software. Sourcetoreceiver traveltimes can be analyzed to calculate velocities or attenuation coefficients. Cross borehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes. The geophysical tomography team crosshole resistivity. Crossborehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes. Crosshole sonic logging csl using stateoftheart equipment, terracon professionals can provide deep foundation nondestructive testing ndt services throughout the country. Application of crosshole tomography for assessment of soil. Jan 02, 2007 the results of the borehole deviation measurements were used to determine the distance between boreholes at depth, which in turn facilitated the reduction and interpretation of cross hole seismic velocity survey data and the interpretation of the cross hole seismic tomography data. 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.
Our software reflexw is one of the worlds most popular geophysical near surface. Geodetic surveys transmission line survey gaveshanageo. Borehole seismic methods largely fall into two categories, namely, crosshole seismics and seismic tomography. Geotomcg 2d3d tomography traveltime inversion software. It is also possible to specify anisotropy for each point of the grid. Geodetic surveys transmission line survey geodetic surveys are conducted for various end uses, such as, route alignments, laying of transmission line and pipeline, 2d3d seismic exploration, and so on. The crosshole sonic logging csl measurement system to measure the quality of physical model of bored pile article pdf available in journal of physics conference series 7391. The 3d ct wizard facility allows users to quickly set up and scan a component to obtain 3d ct data. Borehole geophysics is the science of recording and analyzing measurements of physical properties made in wells or test holes. Pdi, is the largest manufacturer of industrystandard, high quality deep foundation testing solutions, worldwide. These tubes are usually attached to the reinforcement cage along the full length of the shafts. 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 sippi also includes the implementation of multiple methods for computing the travel time delay between a set of sources and receivers. Our geotechnical engineering personnel have been trained on and use stateoftheart equipment and software developed by pile dynamics, inc.
The method is used in radiology, archaeology, biology, atmospheric science, geophysics, oceanography, plasma physics, materials science, astrophysics, quantum information, and other areas of science. Seismic tomography is a technique for imaging the subsurface of the earth with seismic waves produced by earthquakes or explosions. Following picking the raw traveltime data is input into the modeling software and the ray coverage between displayed as a ray density profile right. In the same vein, we never lend our equipment to others on hire. Single hole, directional radar can be used to identify the location and orientation of fracture zones, and cross hole tomography can be used to delineate fracture zones between boreholes. The development of crosshole measurement system on physical bored pile modeling was. List of seismic tomography companies, manufacturers and suppliers.
This section contains examples for setting up and running an cross hole tomographic inversion using sippi using the reference data from arren. The seismic refraction tomography software allows reliable imaging of subsurface velocity structure including faults, strong lateral velocity variation and other velocity anomalies. 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. The word tomography is derived from ancient greek tomos, slice, section and.
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