This software package includes crosshole survey design, model building. General crosshole procedures environmental geophysics. The following projects have unknown licensing, licenses or other conditions which place some restriction on use or redistribution, or which depend on nonopensource software like matlab or xvt and therefore do not meet the open. A couple of years ago i set about trying to collect geoscience floss into a couple of wikipedia pages. The survey will identify the depth and extent of highly conductive brine layers as. There is no better way to collect high resolution subsurface data than with groundbased sensors or boots on the ground. Contact us to find out more about our volterra acquisition system and how we can contribute to your project. We use stateoftheart geophysical equipment and processing software and utilize 2d and 3d data visualization, gis, and modeling techniques to provide useful solutions.
Geotomographie, founded in 1999 in germany, provides complete solutions for borehole and nearsurface seismic surveys to geophysical, engineering and mining companies. Sj geophysics has experience working with geophysical data. Energy generated at the source propagates to the geophone in the form of compression or shear waves which are recorded and stored. 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. This is a list of free and opensource software for geophysical data processing and interpretation. Crosshole ipresistivity surveys for gold geophysics. Seismic methods can provide detailed information about rock properties and geological structure between boreholes. Boreholeip cross hole, surface to borehole, combined borehole and surface 3dip surveys unique to sj geophysics. From regional exploration to reservoir development and production optimization, geophysics is a critical tool to solve the most complex structural and stratigraphic challengesincluding advanced seismic processing, depth imaging, and 3d, 2d, and prestack seismic interpretation as. Moreover, the crosshole resistivity tomography method can detect the target with great accuracy. The main difference between them is the location of the geophones and the seismic source. However, crosshole geophysical testing may show that the ground has been suitably improved in some cases where cone penetration tests are unable to demonstrate an equivalent level of improvement. Borehole seismic methods largely fall into two categories, namely, crosshole seismics and seismic tomography.
Sensitivity analysis of cross hole electrode arrays. Crosshole geophysical testing is generally conducted in the near. Crosshole seismic surveys measure the time for horizontally traveling compressional p and shear s waves to travel from a source hole to a receiver hole. Cross hole ipresistivity surveys for gold geophysics. This limitation has encouraged the use of cross hole geophysical techniques such as cross hole. With technology today many companies offer free geology software and freeware alternatives to specialized software packages.
The flow of reservoir fluids from one zone to another. Nov 18, 2014 downhole, or borehole, geophysical surveys measure the physical properties of rocks along a subsurface drill hole. Borehole seismic surveys can be carried out in several different ways. Application of cross hole seismic tomography in characterization of heterogeneous aquifers. The source and geophone are always at the same elevation, and the energy from each shot is measured at a single depth in each receiver hole. A page by mark hounslow with software for palaeomagnetic directional analysis and statistics, tectonic plate reconstruction, rock and environmental magnetic stereo and 2d data plotting, solid earth geophysics teaching, and more. There is no better way to collect high resolution subsurface data than with groundbased sensors or. List of free geology software and list of free geophysics software, following the format of other similar pages. Cross hole seismic profiling cross hole seismic methods measure the oneway travel time of seismic energy transmitted between boreholes to determine the bulk material properties of the intervening materials. Aggregates and quarry archaeological investigation civil engineering communication construction. General crosshole procedures environmental geophysics us epa. They describe the concept of crosshole and downhole geophysics for the measurement of shear wave velocity in the field.
Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source and receiver. Manufacturer of seismic borehole equipment for tomography, crosshole and downhole applications. Crosshole seismic testing, however, should never be. For example, the license may rule out use by certain people or for certain purposes, e.
Synchrotronbased porenetwork modeling of twophase flow in nubian sandstone and implications for capillary trapping of carbon dioxide. Crossflow can occur when a lost returns event is followed by a well control event. Highlights laboratory study of cross hole ert in wellknown and controlled conditions. Overview historical data and geologic maps surface geophysics borehole geophysics crosshole testing hydraulic measurements hydraulic testing, water levels, sampling, pumping tests.
Director of the ntua applied geophysics laboratory and g. Seismic and nonseismic interpretation, from basin to reservoir scale. The downhole technique consists of measuring the arrival of seismic waves emitted from the surface in increments down the borehole. Fewer boreholes are needed to achieve a continuous picture of the subsurface thereby reducing overall costs and the risk of missing target features. It is then clamped at intervals, commonly five feet, and at each interval the board is hammered. The list is split into broad categories, depending on the intended use of the software and its scope of functionality. Standard test methods for crosshole seismic testing. Zondst2d is designed for twodimensional interpretation of seismic tomography data on refracted and reflected waves land, crossborehole and water variants. Utilizing our unique volterra borehole acquisition system, all data is logged within the acquisition unit downhole eliminating the. Wirelineconveyed tools and systems for highresolution seismic images in and beyond the borehole. Borehole geophysics is the science of recording and analyzing measurements of physical properties made in wells or test holes. This is a list of free and opensource software for geological data handling and interpretation.
This website beta version contains information on geophysical methods, references to geophysical citations, and a glossary of geophysical terms related to environmental applications. Fullagar geophysics provides interpretational expertise, software solutions, research, and training to the mining industry, worldwide. Seismic tomography, crosshole, downhole geotomographie gmbh. Exploring the shallow subsurface, by burger, sheehan, and jones. Realizing geophysical investigations in a wide range of projects e. The crosshole technique uses a seismic source located in an adjacent borehole. Active standard astm d4428 d4428m developed by subcommittee. Seismic data processing software geotomographie gmbh.
I thought you and others might be interested in those. Geophysics expertise, seismic data, and digital capabilities. Once entered the information for the project, the depth reached and the travel times, we can get. The following projects have unknown licensing, licenses which place some restriction on use or redistribution, or depend on nonopensource software like matlab, and therefore do not meet the open source definition from the open source initiative. Crosshole seismic profiling crosshole seismic methods measure the oneway travel time of seismic energy transmitted between boreholes to determine the bulk material properties of the intervening materials. Software for processing of seismic tests using downhole method. Model stacking technique to improve the quality of resistivity models. Owing to the high cost of this test, the cone penetration test method is generally used. Tomoxpro is the only commercial crosshole software package in the seismic industry. Downhole geophysics in mineral exporation geology for. Seismic software to process and analyze seismic data gathered from tomography, crosshole, downhole, refraction, reflection and masw measurements.
Crosshole seismic overview a threeaxis geophone is lowered into a speciallyprepared, cased borehole and excited with a hammer source in a similar borehole nearby. 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. Probes that measure different properties are lowered into the borehole to collect continuous or point data that is graphically displayed as a geophysical log. View the help topics for the software includes some faqs. Contact us with respect to your geophysical program. We have over 40 years of experience, and you can rent. Collier geophysics provides a full range of geophysical services to meet your project needs, including. Update home for field geophysical software suite that accompanies introduction to applied geophysics. Downloads are available as either unix gzipped tar files or windows zip files. Weve pioneered depth migration technologies and broadband processing and continue to heavily invest in improving algorithms such as reflection fullwaveform inversion, reverse time migration, and leastsquares migration. Multihole seismic modeling in 3d space and crosshole. Following picking the raw traveltime data is input into the modeling software and the ray coverage between displayed as a ray density profile right. The cross hole technique uses a seismic source located in an adjacent borehole.
Here are the guidelines for geophysical software and algorithms papers. Multi hole seismic modeling in 3d space and cross hole seismic tomography analysis for boulder detection. Travel times are used to determine p and s wave velocities, which can be used to compute poissons ratio, as well as the other elastic moduli. Mayne, school of civil and environmental engineering in georgia tech. Prior to 1998, the company was named as geophysics gprtojo limited, a joint venture company having equal equity participation of canadian and indian. An external seismic energy source is used within one borehole, and arrays of receiving geophones are lowered into nearby boreholes. The 27th annual symposium on the application of geophysics to engineering and environmental problems 2014, pp. Sales, rentals of seismic sources, receivers and processing software, training and support. Gas hydrate production research well program, mackenzie delta, northwest territories, canada. Multihole seismic modeling in 3d space and crosshole seismic tomography analysis for boulder detection. Application of crosshole seismic tomography in characterization of heterogeneous aquifers. This becomes uniquely critical when only two drill holes are used i.
Cross hole ipresistivity surveys for gold exploration. Downhole survey a sturdy hardwood board is laid beside the wellhead, and a downhole seismic, three component, clamping geophone is lowered into the hole. This page includes two powerpoint pages created by professor paul w. In this discussion i would like to ask what sort of free or low cost software alternatives are being used in the mineral exploration and mining industry. Notice that free and opensource requires that the source code is available. If the address matches an existing account you will receive an email with instructions to reset your password.
Westerngeco has continuously led the industry in innovation and technical improvements that meet your subsurface imaging challenges. Our specialities include integrated interpretation of electromagnetic, gravity, magnetic, and borehole data for both exploration and mining applications. Crosshole seismic tomography geophysics geoscienceworld. 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. The cross hole technique is part with the down hole technique of the borehole seismic surveys. Our aim is to extract maximum value from our clients data. Pdf the potential of seismic crosshole tomography for. Solutions for borehole and nearsurface seismic surveys. These surveys employ the use of down hole geophones and either down hole or surface hammers, depending on the application. Access to all relevant crossdomain data to accelerate hydrocarbon discovery. The crosshole tomography results are extracted from the first arrival travel time wave field shown in. Iconic announces expansion of nevada lithium claims, geophysics contract zonge international has been contracted to conduct a magnetotellurics mt geophysical survey over the gravity low. Pdf application of crosshole seismic tomography in. Nov 24, 2011 a couple of years ago i set about trying to collect geoscience floss into a couple of wikipedia pages.
Our software reflexw is one of the worlds most popular geophysical near surface. Invariant are requirements to measure both p and s waves and to use a reversible source to aid in. Geographic information systems gis this important class of tools is already listed in the article list of gis software not true free and opensource projects. The list is split into broad categories, depending on the intended use of the software and its scope of functions. Pdf seismic crosshole tomography has been commonly used in oil and gas. Laboratory study of the crosshole resistivity tomography. The down hole technique consists of measuring the arrival of seismic waves emitted from the surface in increments down the borehole. Methods borehole geophysics borehole seismic methods. This procedure is covered by an astm guideline but has several variants. This includes land and marine seismic systems, land, marine, and airborne magnetometers, as well as our full line of electromagnetic equipment. D4428 d4428m14 standard test methods for crosshole seismic testing precision cross hole seismic test seismic crosshole method. Geophysical tomography imagewingenerates tomographic images from cross hole and cross gallery radio, radar, and seismic data. Qualitative and quantitative analysis of certain electrode arrays.
Astm d4428 d4428m 14 standard test methods for crosshole seismic testing. The higher pressured reservoir fluid flows out of the formation, travels along the wellbore to a lower pressured formation, and then flows into the lower pressure formation. Crosshole ipresistivity surveys for gold exploration. Explorers use drill holes to collect core or rock chips, to map the rock types down the hole and often send rock chip samples for geochemical analysis. Geophysics at the borehole and crossborehole scale carole johnson, john lane and john williams ogwbranch of geophysics. Pdf crosshole seismic testingprocedures and pitfalls. This limitation has encouraged the use of crosshole geophysical techniques such as crosshole. 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. Global geophysics provides a full range of marine, terrestrial and borehole geophysical services to the following communities.
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