Seismic interpretation software, refraction analysis. A tomogram is a series of 2d images, called slices which stack together to form a 3d image. 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. This direction is used for detailed studies of rocks velocity structure in the. The most popular in engineering geophysics was crosshole seismotomography. Application of crosshole tomography for assessment of.
It will start with introduction to sgrat software for staggered grid seismic data. Geotomographie, founded in 1999 in germany, provides complete solutions for borehole and nearsurface seismic surveys to geophysical. Training of joint inversion seismicgravity for exploration and development at pertamina utc jakarta with dr. The fourth chapter is an attempt to apply staggered grid inversion in a seismic crosshole tomography to increase its resolution. Our systems support additional features such as automated robotic scanning. Crosshole ultrasonic tomography is referred to ray tracing by griding method and image reconstruction by combining the successively linearized iteration with damping leastsquares qr. First, the crosshole seismic tomography method eliminates. Crosshole sonic logging eval uates the integrity of the con crete of drilled shafts and other. Seismic data can be sorted and edited and traveltimes can be determined. High resolution crosshole 2d seismic tomography youtube. Our software reflexw is one of the worlds most popular geophysical near surface. Computed tomography ct is a powerful nondestructive evaluation nde technique for producing 2d and 3d crosssectional images of an object from flat xray images. The only data files that the demo version can read are the data files included with the.
Additional modules are currently under development. Crosshole seismic tomography which involves measuring travel times. Fewer boreholes are needed to achieve a continuous picture of the subsurface. Pditomo pile dynamics has released the new pdltomo software for analysis of crosshole sonic log ging csi 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. Ahsin farid geophysicist fugro middle east linkedin. The program replaces an older tomography program, with significant advantages. 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. Fullagar et al2000, tronicke et al2001, becht et al2004, was used to produce images. Examination of a new crosshole sonic logging system for. The geotom tomography software consists of to mtim e for measuring traveltimes and geotomcg for tomographic inversions. Crosshole ultrasonic tomography and its application to.
The quality of the tomography results obtained from crosshole data is enhanced by use of the latest software at each stage of processing, from data collection in the field with a champ device. Processing crosshole boreholeradar tomography data as part of the usgs office of ground water, branch of geophysics ogw bg applied geophysical research through the usgs. Experienced user of geophysical and general business software including microsoft office, adobe. Laboratory study of the crosshole resistivity tomography. The commercial inversion code geotomcg geotom 1998, which is widely used in crosshole radar tomography e. One of the newer applications to develop for ct imaging is as a screening tool for lung cancer and other lung diseases. 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. The software is used to process seismic crosshole testing data obtained after astm4428 and to output results. Specially designed for smallscale crosshole surveys, this compact hammer can be used to generate both p and s waves. Pditomo crosshole sonic logging evaluates the integrity of the concrete of drilled shafts and other bored or castinplace deep. It is possible to implement the deviation of the boreholes. Below are just a few of the ways ct applications have expanded in the last 12. Crosshole seismic tomography geophysics seg library. Following picking the raw traveltime data is input into the modeling software and the ray coverage between displayed as a ray density profile right.
Tomography software analyses provide 2d and 3d display of internal concrete conditions, including animation of defects. New tomography software for cross hole sonic logging. Computed tomography ct continues to be a workhorse modality for radiology departments and its utility keeps expanding. Plant roots are complex, threedimensional structures that play a central role in anchorage, water and nutrient acquisition, storage and interaction with rhizosphere microbes. We design seismic borehole sources and receivers and develop specifically tailored software.
Web conference about mivu software and its application at pertamina utc jakarta. Fbm is one of the best software solution for marine problem to improve. To develop an automated method to identify the normal macula and three macular pathologies macular hole mh, macular edema me, and agerelated macular degeneration amd from the fovea. Sales, rentals of seismic sources, receivers and processing software, training and support. Solutions for borehole and nearsurface seismic surveys. The astra tomography toolbox is a matlab toolbox based on highperformance gpu primitives for 2d and 3d tomography, developed jointly by the astravision lab research group at the university of.
Our reconstruction processing engine is optimized for multicore processors, efficient memory access and low cost graphics processing card. The application of vertical seismic profiling and cross. A workshop held at the woods hole oceanographic institution in april 1988 outlined the steps required to determine the feasibility of an ocean seismographic network osn. Both programs are the result of many years of program development, guided by the developer processing data for clients and by users suggestions. Pdf application of crosshole seismic tomography in. Expanding applications for computed tomography imaging. Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source. Seismic tomography, crosshole, downhole geotomographie gmbh. The program re places an older tomography program, with sgnificant advan tages. 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. There are many types of tomography, and i work with one called electron tomography. Equipment and evaluation software for this method is already at hand. In crossborehole resistivity tomography standard electrode configurations do not exist yet.
Seismic tomography is a technique for imaging the subsurface of the earth with seismic waves produced by earthquakes or explosions. Demonstration of joint inversion velocity and anisotropy parameter for 3 boreholes and surface data in zondst2d. Thus, preliminary field tests were performed to determine a suitable combination of arrays and to estimate. The information obtained from crossborehole tomography, when. Seismic data processing software geotomographie gmbh. Sis offers inhouse 2d and 3d computed tomography software. The purpose of this part of the project was therefore to. Electrical impedance tomography as a tool for phenotyping. Computerized macular pathology diagnosis in spectral. In order to understand the behavior of borehole arrays and design better the crossborehole survey, the 2d sensitivity values for a homogeneous halfspace are calculated by the.
Crosshole methods involve measurements made between two boreholes e. 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. This method has also been used as a borehole logging tool 33,34,20,24,14 and as a crosshole logging tool 1,35 in laboratory experiments. This software package includes crosshole survey design, model building and modeling, data preprocessing, cdp transformation, tomography, waveequation. Geophysical methods for characterization and monitoring. Crosshole radar velocity tomography with the ray theory model is an established method for characterizing nearsurface aquifers, in particular for imaging the aquifer water content or porosity. Crossborehole tomography can be thought of as an extension of sonic logging to the reservoir cross section between two boreholes. P, s, and surface waves can be used for tomographic models of. Below are just a few of the ways ct applications have expanded in the last 12 months. Seismic methods can provide detailed information about rock properties and geological structure between boreholes. In fy2004, the usgs office of ground water, branch of geophysics ogw bg continued development of advanced geophysical data processing methods. Electrical resistivity tomography ert is a popular geophysical subsurfaceimaging technique and widely applied to mineral prospecting, hydrological exploration, environmental investigation and civil. Transmission electron tomography fills the gap between high resolution structural methods xray diffraction or nuclear magnetic resonance and optical microscopy.
489 949 483 550 27 555 362 949 970 403 1370 988 600 1349 84 4 359 1492 1444 15 1115 584 1478 921 845 244 346 968 1267 702 1306 531 1001 1168 281 1070 1239 249 173 1129 48 321 950 1248