Application of crosshole tomography for assessment of. Borehole seismic methods largely fall into two categories, namely. Pditomo crosshole sonic logging evaluates the integrity of the concrete of drilled shafts and other bored or. Computed tomography ct continues to be a workhorse modality for radiology departments and its utility keeps expanding. The crosshole tomography that is presented in this paper was conducted using the boreholes which are marked as bp1 and bp2 in fig. These images can then be examined on a computer monitor. Seismic and ground penetrating radar gpr methods are frequently applied to image the shallow subsurface. Jun 06, 2017 pditomo is a 3d tomography imaging tool that supplements the champ output. Development of the borehole 2d seismic tomography software. Borehole seismic methods largely fall into two categories, namely, crosshole seismics and seismic tomography.
This software package includes crosshole survey design, model building and modeling, data preprocessing, cdp transformation, tomography, waveequation. Seismic tomography is a technique for imaging the subsurface of the earth with seismic waves produced by earthquakes or explosions. 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. Surveys by the crosshole radiowave method need a pair of drill holes. Development of a multiscale model of electrical signature of root architectures. Pditomo pile dynamics has released the new pdltomo software for analysis of crosshole sonic log ging csi data. Ct imaging sometimes called cat scanning is a noninvasive medical test that helps physicians diagnose and treat medical conditions.
Pdf seismic crosshole tomography has been commonly used in oil and gas exploration and the mining. The software is used to process seismic crosshole testing data obtained after astm4428 and to output results. Pdf the potential of seismic crosshole tomography for. First, the crosshole seismic tomography method eliminates.
Model stacking technique to improve the quality of resistivity models. Geotomographie, founded in 1999 in germany, provides complete solutions for borehole and nearsurface seismic surveys to geophysical, engineering and mining companies. Our software is customizable for any source trajectory e. Crosshole sonic logging and velocity tomography imaging of. Tarantola, 2005 that involves rays almost parallel which increase condition number of associated s matrix. Pditomo is a 3d tomography imaging tool that supplements the champ output. Laboratory study of the crosshole resistivity tomography.
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. The markerfree alignment is based on cross correlation methods and projection matching. The program re places an older tomography program, with sgnificant advan tages. This section contains examples for setting up and running an cross hole tomographic inversion using sippi using the reference data from arren. Crosshole seismic tomography geophysics seg library. Crosshole tomography ct testing and analysis is normally used in conjunction with. Sensitivity analysis of cross hole electrode arrays. We can also set up a model parameterization, initial velocity model, ray tracing processes, conduct borehole seismic tomography inversion, and finally visualize the inversion results. It features a complete pipeline capable processing data from alignment, reconstruction, and segmentation through to displaying, visualizing, and interacting with 3d reconstructions of tomographic data. Cross borehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes.
Seismic tomography, crosshole, downhole geotomographie gmbh. Crosshole seismic tomography which involves measuring travel times. Our software reflexw is one of the worlds most popular geophysical near surface. In the built environment engineered surfaces or infrastructure e. Tomography software analyses provide 2d and 3d display of internal. Cross hole analyzer champxv integrity of concrete foundations by cross hole sonic logging and single hole logging, in accordance to astm d6760. The simulation with this kind of antenna for application on surface and cross hole tomography radar is compared by using gprmax 2d3d software tool development. Expanding applications for computed tomography imaging. Furnished with chaw data interpretation and reporting software, and with the 3d tomography software pdi tomo as an option. Crosshole tomography ct is an imaging method analogous to catscanning in the medical industry and uses acoustic waves. National laboratory geophysical department department is under construction. There are many types of tomography, and i work with one called electron tomography. This software combines arrival time data from the scans of all pairs of tubes, analyzes the data, and displays the analysis results in various 3d views. Our reconstruction processing engine is optimized for multicore processors, efficient memory access and low cost graphics processing card.
A new technology for oil field characterization article pdf available in geophysics 143 january 1995 with 171 reads how we measure reads. A crosshole sonic logging csl and crosshole tomography ct investigation was performed at the university of massachusetts, amherst, in april of 2000, as part of a competitive program to nondestructively image known foundation defects for 6 drilled shafts. The procedure is to calculate first the appropriate matrixs of travel paths, then evaluate its pseudoinverse s. National laboratory geophysical department is under construction. 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. Comparison of surface and crosshole tomography radar. Fewer boreholes are needed to achieve a continuous picture of the subsurface thereby reducing overall costs and the risk of missing target features. Crosshole 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. Sis offers inhouse 2d and 3d computed tomography software. Pdf application of crosshole seismic tomography in.
Pditomo crosshole sonic logging evaluates the integrity of the concrete of drilled shafts and other bored or castinplace deep foundations. Copenhagen computed tomography toolbox is a collection of applications and libraries for flexible and efficient ct reconstruction. However, we have a wide range of an approved independent geophysical studies specialist subcontractorsproviding a conscientious and reliable services through highlyqualified staff and modern equipment serving consulting engineers, government departments, industrial developers, oil companies, etc. Jeol usa offers tomography support that consists of three software packages. Ct combines xray equipment with computers to produce multiple crosssectional images of the body. Experienced user of geophysical and general business software including microsoft office, adobe acrobat, autocad 2007, surf seis, geosoft oasis montaj. Seismic data processing software geotomographie gmbh. 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. Crosshole sonicultrasonic logging csl system for pile and deep foundation testing using astm d6760. Seismic data can be sorted and edited and traveltimes can be determined. Pdf crosshole sonic logging and frequency tomography.
The geophysical tomography team crosshole resistivity. Optimized arrays for 2d crossborehole electrical tomography. 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. 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. Apr 05, 2020 the tomviz project is developing a cross platform, open source application for the processing, visualization, and analysis of 3d tomographic data. The toolbox apps generally take a set of projections xray intensity measurements and filter and back project them in order to recreate the image or volume that the projections represent. The casing of drill holes should not be conductive. Ahsin farid geophysicist fugro middle east linkedin.
Recently, i study joint inversion of cross hole ert and cross hole srtseismic traveltime tomography. A tomogram is a series of 2d images, called slices which stack together to form a 3d image. Qualitative and quantitative analysis of certain electrode arrays. Crosshole ultrasonic tomography and its application to karst. Tomoj is a plugin for the now standard image analysis and processing software for optical microscopy, imagej. Hence, the tomography analysis may help eliminate uncertainty that may otherwise lead to increased construction or remediation costs. In this software, we used travel time of seismic waves from source to receiver by using pseudo bending ray tracing method as input for tomography inversion.
Solutions for borehole and nearsurface seismic surveys. Sales, rentals of seismic sources, receivers and processing software, training and support. We developed new software for transmission electron tomography, tomoj. I want try some filed data of cross hole traveltime tomography and ert. Optimized arrays for 2d crossborehole electrical tomography surveys. Mar 24, 2019 demonstration of joint inversion velocity and anisotropy parameter for 3 boreholes and surface data in zondst2d. New tomography software for cross hole sonic logging. They were drilled on either side of the roman wall as it is evident from the plan view of concealed antiquities shown in fig. It analyzes wave speeds derived from arrival time data from the scans of all pairs of tubes to yield a wave speed map. Crossborehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two 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. It is possible to implement the deviation of the boreholes. Seismic methods can provide detailed information about rock properties and geological structure between boreholes. Below are just a few of the ways ct applications have expanded in the last 12 months.
Highlights laboratory study of cross hole ert in wellknown and controlled conditions. Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source. Ct testing is often performed after the csl testing has been performed to obtain more information about the size, shape, location, and severity of a suspected defect in a shaft. The images created allow engineers and contractors to determine if repairs are. Cross hole sonic logging and frequency tomography analysis of drilled shaft foundations to better evaluate anomalies locations april 2014 doi. 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. We design seismic borehole sources and receivers and develop specifically tailored software. Using surface and crosshole resistivity tomography in an. 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 crosshole tomography method is used to create a 2d or 3d image of the interior of the foundation element in the area of the defect to determine defect size, shape, and location. Demonstration of joint inversion velocity and anisotropy parameter for 3 boreholes and surface data in zondst2d. Zondgm3d software for 3d gravity and magnetic inversion duration. Crosshole sonic logging eval uates the integrity of the con crete of drilled shafts and other.
675 668 190 497 1105 1617 797 873 219 1241 1292 635 843 488 464 351 376 1399 821 937 246 876 35 136 1476 1416 706 191 379 603 1083 1547 125 800 1290 452 1186 4 490 939 841 469 612 566 755 548