Archive for category Software

Supervised Neural Network Targeting and Classification Analysis for Mineral Exploration

Posted by on Tuesday, 29 April, 2014

Karl Kwan (Geotech LTD) presented at Canadian Exploration Geophysical Society meeting (8 April 2014) methodology and examples of using Neural Network Targeting and Classification at mineral exploration.

“Geophysical survey contractors routinely offer multi-parameter data to clients. For example, a helicopter-borne survey may acquire Time-domain electromagnetic (TDEM), magnetic gradiometer and even gamma-ray spectrometer data (i.e., VTEMplus, Geotech LTD). Exploration geophysicists can certainly take advantage some of the readily available multi-disciplinary (geology, geophysics and remote sensing) and multi-parameter (potential field, EM, gamma-ray spectrometry, and others) datasets for mineral exploration. However, the integration and interpretation of these datasets can be time-consuming and even challenging, especially for large-scale datasets covering large areas with diverse geological conditions. The Supervised Neural Network (NN) Targeting and Classification technique for mineral exploration described and demonstrated by Reford, Lipton and Ugalde, 2004, “Predictive Ore Deposit Targeting Using Neural Network Analysis” (http://www.pgw.on.ca/downloads.html), can be a useful and promising tool for the analysis of multi-disciplinary and multi-parameter data.

In this presentation, the properties or responses of the two feed-forward multilayer Neural Networks, Levenberg-Marquardt (NN with LM training) and Fast Classification (FCNN), as implemented in the current version by PGW, are studied in detail. The supervised NN simulations are performed on specially constructed synthetic data. Intended as a tutorial and the NNs treated as black boxes, the objectives of the exercise are twofold, to demonstrate the targeting as well as classification capabilities of the Neural Networks, and at the same time to show one of the known limitations and to suggest a way to get around it. The utility of the NN tool is demonstrated again with real cases from the Republic of Niger.”

Geosoft is delighted to host the online portion of the Canadian Exploration Geophysical Society meeting with keynote speaker Karl Kwan, Geotech LTD.

YouTube:  


Rio Tinto: “Geophysics playing an increasingly important role”

Posted by on Tuesday, 17 December, 2013

by VIRGINIA HEFFERNAN on DECEMBER 11, 2013 EXPERTISE

 

“Despite a steep appreciation in exploration spending over the past decade, the number of greenfield discoveries is falling every year. Narrowing this gap will require harnessing the power of big data and cloud computing, according to a presentation by Rio Tinto’s exploration chief Stephen McIntosh at the International Geophysical Conference in Melbourne.

“In a lot of cases, we have the data but we haven’t got the most out of it because of time constraints and our ability to find or “discover” this data,” Amanda Butt, McIntosh’s colleague and former manager of exploration and geophysics, said in a follow-up interview with Earth Explorer. “Now that we can do things more quickly, and efficiently we can get more effective information out of the data.”

Geophysics, in particular, has become an increasingly important exploration tool as the depth of the average discovery moves from close to surface in the 1950s to hundreds of metres deep. Indeed, geophysics contributed significantly to nine of the 16 greenfields discoveries Rio Tinto has made since 1996, including the Diavik diamond mine in Canada and more recently at the La Granja copper project in Peru.”

the original story


EMIT Maxwell Configuration File for VTEM system

Posted by on Sunday, 10 March, 2013

PDF file


visualization of geophysical data – tips for Surfer users

Posted by on Saturday, 12 January, 2013

MYCARTA blog:

“I have been thinking for a while about writing on visualization of geophysical data. I finally got to it, and I am now pleased  to show you a technique I use often.  This tutorial has shaped up into 2 independent posts: in the first post I will show how to implement the technique with Surfer, in the second one with Matlab (you will need access to a license of Surfer 8.08 or later, and Matlab 2007a or later to replicate the work done in the tutorial).

I will illustrate the technique using gravity data since it is the data I developed it for. In an upcoming series of gravity exploration tutorials I will discuss in depth the acquisition, processing, enhancement, and interpretation of gravity data (see [1] and [4]). For now, suffice it to say that gravity prospecting is useful in areas where rocks with different density are laterally in contact, either stratigraphic or tectonic, producing a measurable local variation of the gravitational field. This was the case for the study area (in the Monti Romani of Southern Tuscany) from my thesis in Geology at the University of Rome [2].

In this part of the Apennine belt, a Paleozoic metamorphic basement (density ~2.7 g/cm3) is overlain by a thick sequence of clastic near-shore units of the Triassic-Oligocene Tuscany Nappe (density ~2.3 g/cm3). The Tuscan Nappe is in turn covered by the Cretaceous-Eocene flish units of the Liguride Complex (density ~2.1 g/cm3).”

Details…


VOXI: The New Generation of 3D Mining Software

Posted by on Friday, 24 August, 2012

Geosoft VOXI Earth Modelling is among the 3D technologies cited in the Engineering and Mining Journal (E&MJ) article, New Generation of 3-D Mining Software Sets the Scene. The article looks at different technologies, 3D display systems, high-performance cloud computing and robust data management tools, that are contributing to greater understanding of what lies beneath the surface in exploration and mining.”

Read the full article in the Engineering & Mining Journal.

VOXI (Advanced 3D geophysical modelling) is a new geophysical software service that generates 3D voxel models from airborne or ground gravity and magnetic data. VOXI Earth Modelling is accessed through the Oasis montaj software and uses the power of cloud computing to rapidly create 3D models of large exploration datasets.


“Detecting vanadium and graphite deposits with EM methods”

Posted by on Monday, 23 July, 2012

CARMELA BURNS on JULY 19, 2012

“The recent rush to find graphite and vanadium deposits to satisfy potential demand in green energy applications is reigniting airborne electromagnetic (EM) methods as highly effective exploration tools.”

read more..


VOXI: Presentation.

Posted by on Thursday, 19 July, 2012


The Maxwell and CSIRO Workshop schedule and booking form for 2012 is now available

Posted by on Thursday, 21 June, 2012

______________________________________________________________

The 2012 Maxwell software training schedule and booking form is now available. Please see the PDF below.

Many hardware and software queries can be answered by EMIT staff over the phone. However, for more intensive personalised training, we can organise one-on-one training sessions either at your workplace or at our office in Midland. Alternatively, customised sessions for your acquisition or interpretation groups can be held at your organisation using your data.

EMIT Workshop Schedule and Booking Form 2012 (Maxwell and CSIRO)
EMIT Workshop Agenda – Maxwell
EMIT Workshop Agenda – CSIRO

Participants are encouraged to book four (4) weeks ahead to ensure their desired workshop dates. Each workshop will be confirmed only when the minimum of four (4) bookings have been received. Workshops are limited to ten (10) participants.


The Geosoft VOXI development story

Posted by on Wednesday, 30 May, 2012

Released in April, 2012, Geosoft’s VOXI Earth Modelling service gives exploration geophysicists the ability to convert magnetic and gravity data directly into useful 3D Earth models that can be integrated with other 3D exploration data.

Read more:


Geosoft 2012 update

Posted by on Friday, 4 May, 2012

The Geosoft 2012 Software Release includes updates to Oasis montaj, Target, Target for ArcGIS and GM-SYS Modelling software. New capabilities and workflow improvements help save time and provide greater flexibility when visualizing multidisciplinary geoscience data in 2D and 3D.

Improved 2D to 3D workflows in Target for ArcGIS: The 2D to 3D workflow enhancements, include new display capabilities, and new section import and export options. Layers, such as interpretation layers from sections or plans can now be easily displayed in their correct geospatial orientation within your 3D view. 2D section interpretations can be exported to a 3D georeferenced file, such as shapefiles or DXF files, to be shared with other 3D applications. 3D vector files, such as open pit outlines, and wire frames can now be easily imported to multiple section and plan maps.

3D Viewer improvements: Geosoft 3D gridding methods have been expanded to include IDW and direct gridding; these new methods better support the 3D gridding of a broad range of data types. Angled clipping of objects in 3D views provides the ability to clip parallel or perpendicular to dataset orientation or geological strike. Geoscientists can set a clipping plane that aligns with any direction chosen.

Expanded GM-SYS 3D density model support: Voxels can be used to define the 3D density variation within GM-SYS 3D model layers. This provides more direct integration with 3D seismic data as the generated density cubes may be used directly in the GM-SYS model.

Geosoft has released VOXI Earth Modelling, a cloud-based geophysical inversion software service that generates 3D voxel models from airborne or ground gravity and magnetic data. VOXI is available as part of the Geosoft 2012 Software Release.

Over the past decade, 3D geophysical modelling has become increasingly important to exploration around the world. The ability to convert geophysical measurements directly into 3D images of subsurface rock properties that can be integrated with other exploration information in three dimensions enables resource explorers to extract significantly more insight from geophysical data.

“One of the important benefits of converting gravity or magnetic data into a 3D earth model is that the visual end product allows explorers to see and understand the subsurface using now common 3D viewing platforms,“ said Ian MacLeod, Geosoft Chief Technologist. “VOXI produces a model of rock properties, which can be directly integrated with other surface and subsurface geologic observations. ”

Integration is important, says MacLeod, because no one technique provides all the answers. “Geophysical models often need to be constrained by geological and geochemical observations in three dimensions. Our aim as explorers is to develop the most complete subsurface picture of geology and mineral systems that we can.”

Geosoft experts and industry collaborators have presented on the topic of 3D modelling at a number of global conferences. Here are some highlights:

SBGf Forum paper on Non-Uniqueness in Potential Field Inversion With Application to the Potiguar Basin: by Robert Ellis
ASEG technical paper on Inversion of Magnetic Data from Remanent and Induced Sources: by Robert Ellis, Barry de Wet and Ian Macleod
EAGE presentation on 3D Gravity and Magnetic Model of a Triassic Large Igneous Province Vent in Central Alaska Range, Alaska: by Gerry Connard.
PDAC presentation on VOXI: A cloud approach to Earth Modelling: by Ian Macleod.

In the Community: Geosoft sponsorship supports CET geophysical image analysis research

Geosoft recently announced a Knowledge from Data© Sponsorship to support continuing collaboration between Geosoft and Australia-based Centre for Exploration Targeting (CET). This support will facilitate relevant image analysis research through short-term CET student projects and communication between CET academics and Geosoft.

“Geosoft’s collaboration with the Centre for Exploration Targeting has grown over the years, and we’re pleased to support CET research initiatives through sponsorship,” said Darin Bryce, Managing Director, Geosoft Australia. “We look forward to contributing to applied research and technology outcomes that progress our shared goal of improving the success of exploration targeting.”

The CET’s Geophysics and Image Analysis research initiatives are aimed at making significant and valued contributions to improve efficiency, accuracy and consistency in the use of data for the mining and exploration industry and other geoscientific communities.  The objective is to maximize human intuition and minimize human biases in geoscientific data analysis though computer aided interpretation and computer field technology.


VOXI Earth Modelling technology

Posted by on Saturday, 10 March, 2012

Geosoft introduced VOXI Earth Modelling, a geophysical inversion software service that generates 3D voxel models from airborne or ground gravity and magnetic data, at thePDAC 2012. Ian MacLeod, Geosoft Chief Technologist, also presented a talk entitled VOXI – A Cloud Approach to Earth Modelling for Exploration during the Geophysical Technical Session at the PDAC.

“One of the important benefits of converting gravity or magnetic data into a 3D earth model is that the visual end product allows explorers to see and understand the subsurface using now common 3D viewing platforms.“ said MacLeod. “VOXI produces a model of rock properties, which can be directly integrated with other surface and subsurface geologic observations.”

Integration is important, says MacLeod, because no one technique provides all the answers. “Geophysical models often need to be constrained by geological and geochemical observations in three dimensions. Our aim as explorers is to develop the most complete subsurface picture of geology and mineral systems that we can.”

The technique of modelling the earth through inversion has been used successfully within mineral exploration industry for well over a decade, and the benefits have been well documented.  The ability to convert geophysical measurements directly into 3D images of the subsurface that can be integrated with other exploration information in three dimensions has enabled resource explorers to extract significantly more insight from their geophysical data. Insights generated from these 3D earth models have helped mineral explorers to sharpen their prospecting and improve their drill targeting, particularly in challenging subsurface environments.

Video

more…

by CARMELA BURNS on MARCH 9, 2012


VOXI Earth Modelling at PDAC

Posted by on Tuesday, 28 February, 2012

4pm daily, booth 931

The next generation of advanced geophysical 3D modelling for deeper exploration targets.

VOXI harnesses the power of the cloud to make these advanced tools accessible to all geophysicists within the Oasis montaj environment, as a service, when they need them. Complex geophysical models can now be quickly processed by anyone, anywhere.

To learn more come to the Geosoft booth 931, 4pm on Sunday, Monday or Tuesday.

For more information please visit the Geosoft event details page.


A MATLAB program to invert the gravity anomaly

Posted by on Tuesday, 14 February, 2012

3DINVER.M: A MATLAB program to invert the gravity anomaly over a 3-D horizontal density interface by Parker-Oldenburg’s algorithm.

David Gómez Ortiz and Bhrigu N P Agarwal

A MATLAB source code 3DINVER.M is described to compute 3D geometry of a horizontal density interface from gridded gravity anomaly by Parker-Oldenburg iterative method. This procedure is based on a relationship between the Fourier transform of the gravity anomaly and the sum of the Fourier transform of the interface topography.  Given the mean depth of the density interface and the density contrast between the two media, the three-dimensional geometry of the interface is iteratively calculated. The iterative process is terminated when either the RMS error between two successive approximations is lower than a pre-assigned value- used as convergence criterion, or until a pre-assigned maximum number of iterations is reached. A high-cut filter in the frequency domain has been incorporated to enhance the convergence in the iterative process. The algorithm is capable of handling large data sets requiring direct and inverse Fourier transforms effectively. The inversion of a gravity anomaly over Brittany (France) is presented to compute the Moho depth as a practical example.

Download MATLAB code and data file examples


Visualization of geophysical data: Surfer

Posted by on Thursday, 9 February, 2012

“I have been thinking for a while about writing on visualization of geophysical data. I finally got to it, and I am now pleased  to show you a technique I use often.  This tutorial has shaped up into 2 independent posts: in the first post I will show how to implement the technique with Surfer, in the second one with Matlab (you will need access to a license of Surfer 8.08 or later, and Matlab 2007a or later to replicate the work done in the tutorial).

I will illustrate the technique using gravity data since it is the data I developed it for. In an upcoming series of gravity exploration tutorials I will discuss in depth the acquisition, processing, enhancement, and interpretation of gravity data (see [1] and [4]). For now, suffice it to say that gravity prospecting is useful in areas where rocks with different density are laterally in contact, either stratigraphic or tectonic, producing a measurable local variation of the gravitational field. This was the case for the study area (in the Monti Romani of Southern Tuscany) from my thesis in Geology at the University of Rome [2].

In this part of the Apennine belt, a Paleozoic metamorphic basement (density ~2.7 g/cm3) is overlain by a thick sequence of clastic near-shore units of the Triassic-Oligocene Tuscany Nappe (density ~2.3 g/cm3). The Tuscan Nappe is in turn covered by the Cretaceous-Eocene flish units of the Liguride Complex (density ~2.1 g/cm3).

During the deformation of the Apennines, NE verging compressive thrusts caused doubling of the basement. The tectonic setting was later complicated by tensional block faulting with formation of horst-graben structures generally extend along NW-SE and N-S trends which were further disrupted by later and still active NE-SW normal faulting (see [2], and reference therein, for example [3]).”

Read more…

1] If you would like to learn more about gravity prospecting please check these excellent course notes.

[2] Niccoli, M., 2000:  Gravity, magnetic, and geologic exploration in the Monti Romani of Southern Tuscany, unpublished field and research thesis, Department of Earth Science, University of Rome La Sapienza.

[3] Moretti A., Meletti C., Ottria G. (1990) – Studio stratigrafico e strutturale dei Monti Romani (GR-VT) – 1: dal Paleozoico all’Orogenesi Alpidica. Boll. Soc. Geol. It., 109, 557-581. In Italian.

[4] Typically reduction of the raw data is necessary before any interpretation can be attempted. The result of this process of reduction is a Bouguer anomaly map, which is conceptually equivalent to what we would measure if we stripped away everything above sea level, therefore observing the distribution of rock densities below a regular surface. It is standard practice to also detrend the Bouguer anomaly to separate the influence of basin or crustal scale effects, from local effects, as either one or the other is often the target of the survey. The result of this procedure is typically called Residuals anomaly and often shows subtler details that were not apparent due to the regional gradients. Reduction to rsiduals makes it easier to qualitatively separate mass excesses from mass deficits. For a more detailed review of gravity exploration method check agai nthe notes in [1] and refer to this article on the CSEG Recorder and reference therein.


Details about an Airborne Survey in the Yukon

Posted by on Monday, 30 January, 2012

Airborne geophysics in combination with geochemistry is helping to unveil more deposits in the Yukon’s White Gold district.

By Virginia Heffernan

in Earth Explorer Magazine



Seismic Interpretation Toolkits

Posted by on Thursday, 22 September, 2011

TerraSpark® Geosciences LLC has announced the launch of its first series of highly-anticipated seismic interpretation toolkits. The toolkits were unveiled on the first day of the SEG Annual Meeting in San Antonio. TerraSpark (Booth 3208) is featuring scheduled product demonstrations of each toolkit during the conference.

These toolkits are specifically designed to enable interpreters and explorationists to solve today’s most demanding and resource-intensive seismic interpretation problems. Each toolkit can be modified to accomplish any interpretation task, taking advantage of any or all capabilities of TerraSpark’s flagship software platform, Insight Earth®.

“For decades, seismic interpreters have struggled to find newer, better ways to engage the most pressing geophysical and geological interpretation problems,” notes TerraSpark CEO Geoffrey Dorn. “These toolkits represent a new trend in 3D seismic interpretation, one that lies with developing well targeted, specifically-designed interpretation platforms that address these uniquely difficult exploration challenges, with the end result being better interpretation outputs, more effective workflows, and superior business decision making.”

The toolkits include the following:
Shale Resource Play Toolkit™
Complex Structure Toolkit™
Salt Velocity Modeling Toolkit™

Shale Resource Play Toolkit
The Shale Resource Play Toolkit helps users locate areas of enhanced fracture density and optimize the well path for maximum production. By mapping micro-seismic data together with seismic and well data, the toolkit helps to identify facies-change boundaries and reduce drilling risk.

Complex Structure Toolkit
TerraSpark’s Complex Structure Toolkit helps users overcome inaccurate and incomplete fault interpretation, especially in complex, highly faulted regions. The toolkit helps to identify and accurately interpret complicated structural environments and ultimately avoid dry holes, missed opportunities and diminished revenue.

Salt Velocity Modeling Toolkit
The Salt Velocity Modeling Toolkit helps interpreters quickly create a closed three-dimensional (3D) geobody, even in the most poorly imaged areas. Users can also create a mask volume without having to export to a separate velocity modeling package, reducing interpretation and model building time.

The toolkits are powered by TerraSpark’s Insight Earth proprietary tools and technologies, including Domain Transformation™, Automated Fault Extraction™ and Surface Wrapping™. To learn more, visit www.terraspark.com/toolkits/.


The new MODELVISION release

Posted by on Wednesday, 24 August, 2011

Pitney Bowes Business Insight is pleased to announce the release of Encom ModelVision v11.0. This release includes a range of enhancements to the already powerful collection of tools available in the magnetic and gravity modelling package.

Major advances to the core software as well as the AutoMag module include new body types for joint inversion, direct inversion of the resultant magnetisation vector in both standard and joint inversion and a new magnetic moment remanence calculator tool. The AutoMag options have been upgraded to filter overlapping solutions which greatly enhances the interpretation speed. The user interface has also been improved to provide a more intuitive workflow.

Please click here for further information on the new features available in this release.