Archive for category Publications

From Latest Geoscience Australia News

Posted by on Friday, 7 March, 2014

New geophysical data helps identify suitable CO2 storage sites

 

“New geophysical data collected in the Browse Basin off the northwest coast of Western Australia has been released today by Geoscience Australia. The new data will be used to map the location of faults and volcanic rocks that can influence the suitably of particular areas for the geological storage of carbon dioxide (CO2).” More…

 

 

 

Potential-field data as an aid to identifying the elements of a petroleum system

“Potential-field (gravity and magnetic) data are a valuable addition to geological studies of the systems within the Earth’s crust that host mineral, petroleum and groundwater resources. They provide constraints on density and magnetic susceptibility, both key rock properties that are intricately linked with geology.” More..


Online Geophysics Lectures and Videos

Posted by on Thursday, 23 January, 2014

Geophysics Lectures in University of South Alabama:

Introduction to Geophysics; Seismic Stratigraphy; Wave Theory Refraction and Reflection; Petroleum Generation and Migration; The porosity Logs; Gamma ray logs; Electric SP and Resistivity Logs and many other are on KHURRAM TANVIR Official Page

 


Geology Films

Posted by on Tuesday, 21 January, 2014

During mineral exploration programs using geophysical methods it is highly important to know exploration models and mineralization controlling factors for proper choice of geophysical interpretation methods and approaches.

Clive Willman, geologist and film-maker, has created a series of short films covering Orogenic Gold Deposits, their formation, fluids and faults, illustrating with examples such as the Morning Star and Stawell Gold Mines in Victoria (Australia); The Metamorphic Gold Model; Gold, Faults and Fluids.

Clive presents his subject by way of interviews with leading workers in the field. Clive has worked as a geologist in both Industry and for the Geological Survey of Victoria, and brings a degree of authority to his film-making in this discipline.

Geology Films youtube.com


Multi-image blending for geophysical data visualisation and interpretation

Posted by on Thursday, 9 January, 2014

Interactive multi-image blending for data visualisation and interpretation

P Kovesi, E-J Holden and J Wong

ASEG Extended Abstracts 2013(1) 1 – 5
Published: 2013

Abstract

The ability to integrate data from a range of different images is often a crucial requirement for successful interpretation. Interactive multi-image blending is presented as a tool for facilitating the interpretation of complex information from multiple data sources. Traditionally, image blending has only been considered for cross-dissolving effects between two images. However, it is common for there to be more than just two images of interest in an interpretation task. We have developed a family of different multi-image blending tools to fill this need. These have been designed to support a number of different interpretation tasks and image types. For image blending to be a useful tool for multiple image interpretation it is important that the association between features and individual input images remain identifiable and distinct within the blend. We argue that interactivity of the blend is an important component for achieving this. Blending can also be usefully employed to interactively explore parameter variations for enhancement techniques. Often the best parameter values to use cannot be known beforehand, and it is common for different regions of an image to require different parameter values for best enhancement. By preparing a set of images processed over a sequence of scales and parameter values, and then interactively blending between these images, the interpretation of a data set can be greatly facilitated.

Geophysics researchers win innovation award

A team of researchers at The University of Western Australia has been recognised for its work to develop the most innovative use of a geophysical technique.

Research Professor Peter Kovesi, Associate Professor Eun-Jung Holden and Assistant Professor Jason Wong, won the Laric Hawkins Memorial Innovation Award at the International Geophysics Conference and Exhibition 2013 in Melbourne for their paper “Interactive multi-image blending for data visualisation and interpretation”.

The award is given for the most innovative use of a geophysical technique from a paper presented at the conference. The paper was delivered by Peter Kovesi.

Geoscientific data interpretation aims to understand complex geology in Earth’s subsurface by using a range of information including different types of geophysical, geological and geochemical data.

The ability to integrate a range of different sets of data is often a crucial requirement for successful interpretation, but this is a challenging task which often results in interpretations that are subjective and unreliable.

Nevertheless, these interpretations form the basis of significant economic, social and environmental decisions by resource industry and government agencies.

 


Exploration Geophysics Info on Flipboard

Posted by on Wednesday, 18 December, 2013

Magazine App for iOS and Andriod

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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


Deep Crustal Seismic Reflection Profiling in Australia

Posted by on Wednesday, 11 September, 2013

Deep Crustal Seismic Reflection Profiling Australia 1978–2011 (B.L.N. Kennett, E. Saygin, T. Fomin and R. Blewett) presents the full suite of reflection profiles penetrating the whole crust carried out in Australia from 1978-2011 by Geoscience Australia and various partners. The set of reflection data comprises over 12,000 km of coverage across the whole continent, and provides an insight into the variations in crustal architecture in the varied geological domains. Each reflection profile is presented at approximately true scale with up to 220 km of profile per page and overlap between pages. Each reflection section is accompanied by a geological strip map showing the configuration of the line superimposed on 1:1M geology. The compilation includes a number of large scale reflection transects groups of 1,000 km or more that link across major geological provinces, and an extensive bibliography of reports and relevant publications.

Details and downloading..


Greenland and the Nickel Market

Posted by on Friday, 23 August, 2013

North American Nickel Talks Greenland and the Nickel Market

This week, Nickel Investing News (NIN) had the chance to speak with Neil Richardson, COO of VMS Ventures (TSXV:VMS) and North American Nickel (TSXV:NAN), a Canada-based mineral exploration and development company.

In the interview below, Richardson discusses recent developments at North American Nickel’s Greenland-based Maniitsoq project, including news from the company’s latest press release. He also touches on the company’s plans for its projects in Ontario and Manitoba and shares his thoughts on where nickel prices are headed in the short and long term.

Image courtesy of North American Nickel.

Maniitsoq 2013 field program

NIN: Can you start off by giving a quick rundown of the key things investors should know about North American Nickel?

Neil Richardson: North American Nickel is a junior exploration company focused on nickel and platinum-group elements (PGE) mineralization in North America, mainly in Sudbury, Canada, as well as the Thompson Nickel Belt area in Manitoba. We have completed some exploration work at those projects, but our main project, which is near the community of Maniitsoq in Greenland, is the focus of our current exploration work.

NIN: What is the relationship between North American Nickel and VMS Ventures?

NR: VMS owns a 27.5-percent interest in North American Nickel. North American Nickel was formed back a few years ago by spinning out the nickel assets that we had in VMS; the team that runs VMS is the same team that runs North American Nickel.

Along with our strategic partner, the Sentient Group, VMS holds a large percentage of the shares. Sentient has upped its share to 30 percent, so the two teams, VMS and Sentient, control over 57 percent of the corporation.

NIN: Earlier this month you acquired additional ground at Maniitsoq. How will that benefit the company?

NR: These exploration licenses were just granted recently by the Bureau of Mines and Petroleum, the BMP. We have the documentation in our office now for signing. That includes about 123 square kilometers of additional ground, putting the total up to 5,106 square kilometers of property.

Where we feel this is beneficial to us — we’re flying this ground as we speak — is that it adds more areas into our norite belt that we felt we were missing. Previous landowners in the area have lapsed their licenses and we have taken on about five different new licenses to complete our land package.

NIN: You also recently began drilling at Maniitsoq. What is the status of that program? I saw you put out an update today [July 30].

NR: Right now at Maniitsoq we’re on a two-week break. We were there for six weeks and completed the first phase of our two-phase program, 10 holes for just over 1,500 meters of drilling.

Today’s update is really on that first phase. During the first six-week phase at Maniitsoq we checked over 100 electromagnetic anomalies that we’ve assembled up over the last two years of flying over the belt. With this drilling, to date we’ve collected 567 core samples. We did an extensive channel sampling on some of these areas and submitted 249 channel and surface grab samples. All that data now has been submitted to ALS Chemex and I anticipate results coming back in five to six weeks.

During the two-week break we’re flying an additional 700 line-kilometers of Geotech versatile time domain EM survey (VTEM), our main EM system that we use over there and in our projects for VMS as well. We’ll be following up these targets as well in the second phase.

We’ll be starting the second phase on August 2 and going for another six or seven weeks, wrapping up the program with another 10 holes, or 1,500 to 1,600 meters of drilling.

Image courtesy of North American Nickel.Maniitsoq 2013 field program.

NIN: How have you found Greenland as an operating environment?

NR: Good. The Greenland government is very open to exploration companies. The BMP has guidelines and all you do is follow those guidelines. We have a very good rapport with a company called Xploration Services Greenland ApS. They take care of all our logistical requirements over there, so camp set up and everything like that, organizing sample shipments, is through them as well. They’re a very good exploration logistics company and they make sure we follow the guidelines that BMP stipulates.

Just like Canada, as long as you follow the rules and regulations, you’ll be fine. We’ve done above and beyond what the regulations require and have hired as many people from Greenland as possible — and of course our air support over there is from Air Greenland.

NIN: You mentioned that you’re focusing on Greenland right now, but you also have projects in Ontario and Manitoba. Could you talk a little about your plans there?

NR: We have two projects in Sudbury, Post Creek and Halcyon, they’re side by side. We’ve completed quite a bit of work such as trenching and surface mapping, diamond drilling and some surface geophysics. The one in Sudbury is on care and hold for now, we’re still looking for a strategic partner for this project.

The projects up in Thompson, Manitoba, we’ve completed the airborne surveys, have the interpretation in. We are looking into possibly drilling these targets this upcoming winter season, which would be the winter of 2014. We have somewhere in the neighborhood of four to six holes outlined to date. So that’s our plan. It’ll be VTEM follow-up diamond drill holes for our North Thompson project this winter. We’re looking forward to getting that work underway.

NIN: Your website notes that you’re open to seeking strategic partnerships to advance your properties. Are you currently doing so?

NR: We do have a strategic partner already in Maniitsoq. Our strategic partner there is the Sentient Group. We’re still looking for a partner for our Sudbury project. We are in talks with a few companies, but so far we’re just in discussions.

Image courtesy of North American Nickel.Maniitsoq 2013 field program.

NIN: The International Nickel Study Group has said nickel could record a 90,000-MT surplus this year. When you start producing, will there be demand for your product?

NR: Obviously demand is a big concern. And you’re correct, although I didn’t see 90,000, I have 70,000 to 80,000, which is not that far off. So short term, there will be a very strong surplus of nickel in the market. A report put out by Wood Mackenzie that looks at nickel supply says that for 2013, 2014, 2015 and even 2016, we’re going to have a surplus in nickel supply, but after there should be a shortcoming in nickel supply.

Now, this is from one group. It’s just like trying to predict the gold price. Some guys were saying $2,000 gold, but we’ve seen the gold price crash before we even got there. I think the supply of nickel is the same. It’s very country dependent, as in who’s consuming it. The big ones are China and Europe. If we are starting to see a rebound in European demand, maybe this will come through. But obviously we do anticipate a little bit of a slowdown in China, although their GDP is still pretty impressive at 7 percent, 8 percent. The next place we’re seeing a strong rebound in the market is Japan, and with auto sales doing well in North America, that might help with nickel consumption, but really it comes down to China playing a large role. It’s a big consumer of a lot of base metals.

NIN: Thank you very much for speaking with me.


Does “geophysics” mean only “seismic” in oil exploration?

Posted by on Friday, 23 August, 2013

Magnetic and Gravity Methods in Mineral Exploration: the Value of Well-Rounded Geophysical Skills.

Henry Lyatsky

Geoscience Research & Consulting Ltd., Calgary, Alberta, Canada

The word “geophysics” in oil exploration is often used synonymously with “seismic”, overlooking many other fruitful techniques. In mineral exploration and engineering projects, applicability of seismic imaging is often limited and other geophysical methods take the front seat.

Gravity and magnetic methods, which are discussed in this article, are extremely useful in both mineral and oil exploration. Unfortunately, among oil-industry geophysicists and managers the knowledge and appreciation of these techniques tend to be comparatively thin. Rooted in over-specialized college training, a too-narrow focus on only some geophysical methods impoverishes oil exploration if potential- field surveys are underutilized. By limiting geophysicists’ ability to switch between oil and mining industries, it restricts their employment flexibility and career choices.

The multi-faceted exploration market calls for many different types of geophysical work. Professional associations and alumni groups need to put pressure on academic institutions to diversify and round out their curricula. Fluctuating economic conditions, and future well-being of new graduates, demand nothing less.

Continuing and Details..


“Gravity and Magnetic Exploration Principles, Practices, and Applications”

Posted by on Thursday, 13 June, 2013

the new book

• End-of-chapter exercises, as well as overview and key concepts sections, help to engage students, encapsulate important concepts and consolidate the focus of study
• Online exercises utilising industry-standard software enable readers to develop practical experience
• Ancillary online case studies describe examples of gravity and magnetic methods in diverse successful applications, providing insight into their possibilities and limitations

“Near-Surface Applied Geophysics”

Posted by on Thursday, 13 June, 2013

the new book

• Presents emergent techniques and the newest developments in more traditional techniques, providing a fully up-to-date picture of the field

• Illustrated with insightful case studies selected from the current scientific literature, providing a powerful perspective on each technique’s capabilities
• Provides information on data analysis and inverse theory, essential to giving the reader full exposure to data acquisition, processing and interpretation

Advances in Airborne and Ground Geophysical Methods for Uranium Exploration

Posted by on Tuesday, 30 April, 2013

IAEA (International Atomic Energy Agency) has published a book “Advances in Airborne and Ground Geophysical Methods for Uranium Exploration”.

“Due to growing global energy demand, many countries have seen a rise in uranium exploration activities in the past few years, and newly designed geophysical instruments and their application in uranium exploration are contributing to an increased probability of successful discoveries. This publication highlights advances in airborne and ground geophysical techniques and methods for uranium exploration, succinctly describing modern geophysical methods and demonstrating their application with examples.”

Download..


New Geophysical Articles on Earth Explorer

Posted by on Monday, 11 March, 2013

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The new gravity books

Posted by on Sunday, 3 March, 2013

Acquisition and Analysis of Terrestrial Gravity Data

  • Leland Timothy Long, Georgia Institute of Technology
  • Ronald Douglas Kaufmann, Spotlight Geophysical Services

Gravity surveys have a huge range of applications, indicating density variations in the subsurface and identifying man-made structures, local changes of rock type or even deep-seated structures at the crust/mantle boundary. This important one-stop book combines an introductory manual of practical procedures with a full explanation of analysis techniques, enabling students, geophysicists, geologists and engineers to understand the methodology, applications and limitations of a gravity survey. Filled with examples from a wide variety of acquisition problems, the book instructs students in avoiding common mistakes and misconceptions. It explores the increasing near-surface geophysical applications being opened up by improvements in instrumentation and provides more advance-level material as a useful introduction to potential theory. This is a key text for graduate students of geophysics and for professionals using gravity surveys, from civil engineers and archaeologists to oil and mineral prospectors and geophysicists seeking to learn more about the Earth’s deep interior.

Author(s)/Editor(s):Thomas R. LaFehr and Misac N. Nabighian

Fundamentals of Gravity Exploration (Geophysical Monograph Series No. 17) covers a full range of gravity-exploration topics, including first principles, field instrumentation and operations, rock densities and density contrasts, data reduction, methods of interpretation, and geologic examples.  The subject matter includes inversion and an appendix on the Fourier transform.  This book will help students to efficiently gain knowledge and appreciation for the method, and it will provide experienced earth scientists with a valuable addition to their exploration libraries, both for reference and understanding of this important method.


Potential fields for basement investigations

Posted by on Wednesday, 30 January, 2013

Often not given its due in oil and gas geophysics, knowledge of basement geology can be critical to exploiting reservoirs including the unconventional.

by GRAHAM CHANDLER on JANUARY 24, 2013

There is an article in the last Earth Explorer issue:

New Approach to Basement Studies for Oil and Gas Explorers



The New Near-surface Resistivity Method

Posted by on Monday, 22 October, 2012

“The Leading Edge” has published in October 2012 issue the article of  Roy K. Warren, Warren Geophysical Service (Houston, TX), “Near-surface resistivity for hydrocarbon detection”. The article consists of many case studies which demonstrate the accuracy of the results.

Abstract

Roy K. Warren
Warren Geophysical Service
A new method called the “grid resistivity system” (GRS) is described which measures relative changes in subsurface resistivity using the low-frequency harmonics (either 50 or 60 Hz) generated by electric power lines. The electromagnetic waves emanate from the power grid, and some of this energy interacts with the air-Earth interface to be absorbed by the Earth. The lowest frequency penetrates to the greatest depth. The power from the grid causes current to flow in the rocks and soil. The Earth material with higher conductivity offers a path for the current to follow. The method can help locate geophysical signatures associated with the geochemical response of hydrocarbon chimney leakage. Data collection is fast and low cost. Processing results in cross sections of resistivity. Interpretation focuses on the identification of the larger conductors related to clay alteration caused by chimney leakage from a reservoir. ©2012 Society of Exploration Geophysicists

Seismoelectric & Microgravity in the last FastTIMES issue

Posted by on Tuesday, 9 October, 2012

The EEGS has published the latest issue of FastTIMES, news for the near-surface geophysical sciences. It is available as a pdf document optimized for screen viewing or printing.

Seismoelectric & Microgravity

Volume 17, Number 2, June 2012