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VIC

ASEG Victoria – Technical Meeting Night

Thursday, April 22, 2021
1800
1900

ASEG Victoria is pleased to announce the restart of in-person branch events starting with the first technical meeting night of 2021. You are cordially invited to join us for a talk by Mr. Warren Gray from Seisintel on Thursday April 22nd at 6pm at The Kelvin Club.  Admission to this event is free for members only, so please ensure you have renewed your membership for 2021 before registering.

 

THREE YEARS IN THE MARINE SEISMIC EXPLORATION WORLD

The last three years have been a whirlwind for the offshore marine seismic survey industry. Through 2018-2019 Shearwater had bought WesternGeco’s fleet of 10 seismic vessels and then acquired 7 vessels from CGG. In 2018 Axxis Geo Solutions entered the Ocean Bottom Seismic market with the largest OBN survey conducted in the North Sea. Ocean Bottom Seismic companies Magseis and FairfieldNodal merged. Suriname and Guyana were the new hot spots and West Coast Africa was as busy as ever. Optimism was tentatively returning to discussion at the big exploration conferences. And then 2020 brought about the challenges of COVID-19 with plunging oil prices, slashed exploration budgets, halted projects and challenges in crew and vessel movements. A number of players entered bankruptcy protection or had their banks withdraw support of ongoing vessel operations right in the middle of projects. Using some tools from the Seisintel, we will discuss where the most recent proprietary and multiclient seismic survey activity has been, the latest technologies and acquisition methods being deployed by the industry and look forward to discussing some bright spots of the coming year.

BIO

Warren Gray completed a Bachelor of Surveying at Melbourne University in 1996. Offshore work was always of interest and after cold calling one company in Singapore and a brief ten-minute phone interview, Warren was on the plane one week later. Work was as a navigator and navigation data processor for Western Geophysical on their 3D seismic vessel M/V Western Legend. After three years and during the oil price downturn of 1999 where oil was US$12-barrel, Warren made another cold call from a ship off Angola in West Africa to Veritas (now CGG) in Singapore and was lucky to be offered another job straight away. After six years mostly on the 2D and 3D vessel Pacific Sword around the Asia-Pacific and being married during that period, onshore life was calling in order to start a family. Warren worked as a Survey Officer and later as Environmental Monitoring Manager for the Port of Melbourne during the channel deepening dredging project to deepen the shipping lanes into Melbourne. This brought about a steep learning curve into the GIS and desktop mapping world. The work in the GIS arena proved to be critical to his next role in 2009 where he was geodetic support for Fugro-Geoteam and then CGG. Tasked with design, mapping and planning of marine seismic surveys for tenders and operations, the insight into all facets of the industry were continually compounding. When the opportunity came up late in 2016, Warren jumped at the chance to work with Searcher Seismic and is now Technical Director of their Seisintel product range.

Please register your interest in attending this technical meeting night by using the following link:

https://www.eventbrite.com.au/e/aseg-victoria-technical-meeting-night-tickets-148513609203

Light refreshments will be provided on the evening.  The committee looks forward to this long overdue reunion with fellow members.  We hope to see you all there once again!

Joint annual PESA - ASEG - SPE Summer Social Event

Wednesday, February 24, 2021
1730
2100

Joint annual PESA - ASEG - SPE Summer Social Event

We have re-scheduled our summer social to next Wednesday, 24th February.  Please join us for a riverside evening at Common Man at South Wharf for drinks and nibbles to help kick off 2021. We will be in an outdoor area in our own section of the venue. This event is for members only so please ensure you renew your membership for 2021 before registering.

NOTE: Thank you to members that already booked for the original date.  May I ask that you please rebook this event again if you are still able to attend.  Thank you!

Date: Wednesday 24th February

Time: 5:30 pm onwards

Cost: $10, members only - please register your interest using the below link or reserve your ticket by emailing vicpresident@aseg.org.au directly to secure your booking. Please note, cash payment on the night will be required upon entry for ASEG members.

Bookings close: 5pm Monday 22nd February

https://www.eventbrite.com.au/e/joint-pesa-aseg-spe-summer-social-event-tickets-142036162987

The Victoria Gold Mining & Exploration Forum

Thursday, August 27, 2020
0800
1700

https://www.informa.com.au/event/conference/victoria-gold-mining-explora...

The Victoria Gold Mining & Exploration Forum will be a digitally delivered event on the 27 August 2020. This event will examine the latest developments in gold mining and exploration in Victoria.

The Victorian gold industry is currently experiencing a renaissance, with authorities estimating that there may be approximately AU$150 billion worth of gold still waiting to be discovered in the State. Exploration and investment is ramping up across Victoria as the sector looks towards a reinvigorated future.

Topics will include:

  • Investment in Victoria
  • Market outlook
  • Government perspective
  • Case studies
  • New tenders
  • Community engagement

ASEG Webinar - VIC Branch: How remote is remote sensing from Geophysics?

Wednesday, May 27, 2020
1800 (AEST)
1900 (AEST)

The VIC Branch of the ASEG invite you to join us on ZOOM for the next talk in the ASEG Webinar Series.

 

Please join us on Wednesday 27th May, 6:00 pm (AEST) for a talk by Dr Rob Hewson, University of Twente, NL.

 

How remote is remote sensing from Geophysics?

 

The question of remote sensing’s place in the exploration tool kit has often raised questions, if not eye brows for many geologists / geophysicists. This talk provides a brief overview of the new and available satellite/airborne sensors and archived imagery, to add to this discussion – the advantages, caveats and relevance of it in the tool box. Examples include the AEGC2019 presentation of the multi-sensor and airborne geophysics case study over the Haib Cu porphyry deposit, Namibia.

 

Register Now: https://us02web.zoom.us/webinar/register/WN_tUhOokagSAK9h-HhK7m5Gw

 

After registering, you will receive a confirmation email containing information about joining the webinar.

 

 

Please bring your own drinks and nibbles.

 

Contact secretary@aseg.org.au if you have any questions. 

 

Rob has also requested that the below link be attached which will be discussed during the webinar.

https://2019.aegc.com.au/programdirectory/docs/224.pdf

Vic Tech Night - A new Full Spectrum FALCONⓇ airborne gravity and aeromagnetic survey over the Otway Basin, Victoria

Tuesday, October 1, 2019
1800
1930

Dr Mark McLean, Geological Survey of Victoria presents a talk titled A new Full Spectrum FALCONⓇ airborne gravity and aeromagnetic survey over the Otway Basin, Victoria.

Tickets here

Our next meeting will be a joint event with the Young Professional Group and will happen on the 1st of October 2019. As usual it will be held at the Kelvin Club from 6 pm onward.

We will have the pleasure to welcome Dr Mark McLean from the Geological Survey of Victoria with a presentation about the Falcon survey that was acquired recently in the Otway Basin.

Please register before the 30/09/2019 noon time using the Eventbrite link.

In case of dietary requirement please email directly to vicpresident@aseg.org.au.

Abstract

Seismic surveying has been demonstrated to be the most effective technique to image sub-surface geological structure, particularly within sedimentary basins characterised by sub-horizontal stratigraphy where seismic energy is readily reflected back to the surface. However, there are some examples where seismic acquisition does not provide the most effective results: 1) where the area of interest lies along the coastal transition zone making acquisition problematic, 2) where there are sub-vertical geological structures (such as faults) which cause the seismic energy to be reflected away from the sensors and 3) where volcanic rocks attenuate the seismic signal.

Airborne Gravity Gradiometry (AGG) is a technique which measures very small changes in Earth’s acceleration. This approach is appropriate for the Otway Basin particularly in the transition zone where the geology is poorly understood. Qualitative interpretations can be made in map view, but data can also be quantitatively modelled using forward and inversion modelling processes. This approach makes airborne gravity gradiometry a complementary dataset for most of the seismic in the Otway which is dominated by 2D lines. Therefore, airborne methods provide an opportunity to not only ‘fill in the gap’ along the coast between seismic data collected off-shore and onshore, but there is also potential to add further detail to horizon geometries in between the more widely spaced (3-4km) seismic lines.

A new airborne Full Spectrum Gravity and magnetic survey has been undertaken as part of the Victorian Gas Program (VGP) using CGG’s FALCON® airborne data acquisition system. Flying commenced in August 2018 and was completed by early January 2019 (12 weeks). A total of 31042 line km of gravity, gravity gradiometry (Full Spectrum), magnetic and laser scanner data were acquired along 500 m spaced lines in a NW-SE orientation and 15000 m perpendicular tie lines. The surveyed region includes approximately 16000 km2 of the Otway Basin in Victoria, stretching from the edge of the Otway Ranges to the South Australian border, and from south of the Grampians to approximately 18 km offshore. Data were acquired at an altitude of 150 metres, increasing to 300 metres over built-up areas. A single engine Cessna Grand Caravan 208B was used to conduct the onshore portion of the survey and a DHC-6-100 (Twin Otter) aircraft was used for the offshore component. The survey has resulted in the largest airborne gravity dataset ever collected in Victoria and provides superior quality gravity imagery, compared with pre-existing data.

This presentation will visit a range of topics including the initial rationale for the survey, survey design, instrumentation and acquisition, but some emphasis will be placed on the new Full Spectrum product now being offered by CGG. This survey is the first publicly available Full Spectrum Falcon survey and is intended to capture the full spectrum of wavelengths by conforming the short wavelengths from the gravity gradiometry, with the longer wavelengths obtained from concurrently acquired conventional gravity.

Bio

Mark completed Arts/Science and Master of Science degrees at Monash University and then completed a PhD at The University of Melbourne in 2008 which involved acquisition, interpretation and modelling of an airborne geophysical survey over the Lambert Rift region in East Antarctica. Since then, Mark has worked at the Geological Survey of Victoria building regional 3D framework and rock property models using geological and geophysical datasets. Mark's time is now split between the GSV, and The University of Melbourne where he lectures in Applied Geophysics.

 

VIC:Winter Joint social evening with PESA and SPE

Wednesday, August 28, 2019
1700
2200

Dear VIC member,

 

Please join us for our Winter Joint social evening with PESA and SPE.

 

It will happen on the 28th of August 2019 from 5 pm at our usual venue, Henry & the Fox

 

Venue: Henry & the Fox, 525 Little Collins St, Melbourne VIC 3000

 

Fee:  $10, payable in cash at the venue.

 

RSVP: email directly to vicpresident@aseg.org.au before 23/08/2019 COB with dietary requirement.

VIC Technical night: QGIS for Geoscience – Drill holes & more.

Wednesday, July 31, 2019
1800
2000

Registration: https://www.eventbrite.com.au/e/aseg-technical-night-qgis-for-geoscience-drill-holes-more-tickets-65611958133

Please join us on the 31st of July at 6 pm, at the Kelvin Club.

We will have the pleasure to listen to Roland Hill from MMG Ltd who will be presenting about: QGIS for Geoscience – Drill holes & more.

Please RSVP on Eventbrite by the 30/07/2019 noon.

Any dietary requirement please email directly to vicpresident@aseg.org.au

Abstract:

Earlier this year MMG's Group Manager for Innovation & Geophysics, Roland Hill, made a small but influential splash amongst the Geoscience community with the release of his QGIS plug-in. QGIS is an open-source, cross-platform Geographic Information System. It's small CPU footprint and low RAM requirements makes it well suited to academic and professional applications alike, while it's availability in 48 languages makes QGIS ubiquitous amongst geoscientists world-wide. In short, it's a useful, versatile piece of software which MMG, and many companies like it, use daily. And that is exactly what makes Roland's contribution so important – it’s extremely useful. His plug-in already extended the use of the standard package and with this update, Geoscience for QGIS v1.0, user functionality is extended even further to allow creation and display of drill hole sections

Bio:

Roland Hill is a geophysicist with 28 years’ experience exploring for gold, copper and zinc throughout Australia, Africa, SE Asia and South America. He is currently Group Manager Innovation & Geophysics for MMG based in Melbourne. An accomplished software developer, he specialises in integration of open source libraries for geospatial processing and visualisation.

SEG DISC 2019: Physics and Mechanics of Rocks: A Practical Approach

Thursday, August 22, 2019
09:00
17:00

 See here for more details adn registration: https://seg.org/Education/Courses/DISC/2019-DISC-Manika-Prasad

Intended Audience

  • Seismic imagers and interpreters who want to learn how fluids, stress, and other environmental effects change seismic signatures
  • Geophysicists who wish to derive rock properties and constrain well-to-seismic ties
  • Geologists and sedimentologists looking to develop predictive models of sedimentary environments and stratigraphic events
  • Reservoir engineers to build porosity, permeability, and fluid coverage models for reservoir simulations using 3D and 4D seismic data
  • Basin modelers and completions engineers to evaluate stresses from well log and seismic data
  • Geoscientists doing formation evaluation and well logging interpretations
  • Basin managers and team leaders who wish to evaluate the accuracy of predictions and understand risk and errors in models

Prerequisites (Knowledge/Experience/Education Required)

Attendees should have an understanding of basic rock properties such as porosity, permeability, sediment compositions and depositions, and structural geology. It will be helpful to have familiarity, but not necessarily expertise, in seismic properties. The accompanying textbook will include mathematical details, data and problem solutions for mineral modulus calculations, rock stiffness calculations for textural symmetries, velocity binning in flow zones, pore stiffness, and Gassmann fluid substitution. The lecture will focus on fundamental rock physics principles, applications, and analysis of results.

Course Outline

The course is organized into two main sections: Section I. Rock Physics Fundamentals (introductory section) and II. Advanced Topics in Rock Physics (application section):

Rock physics fundamentals

In this section, I will:

  • Review fundamental principles underlying rock physics, and rock properties
  • Investigate the effects of fluids on rock properties
  • Derive basic rock physics correlations and explain why and how they work
  • Review rock properties that can be mapped with remote sensing

Advanced Topics in Rock Physics

In this section, the student is introduced to:

  • Poroelasticity
  • Attenuation and dispersion
  • Geomechanics
  • Complex electrical conductivity and permeability
  • Investigate the causes for complications and deviations from basic correlations
  • Examine existing empirical and theoretical models
  • Discuss selected case studies in rock physics

Learner Outcomes

On completion of the course, the learner should be able to

  • Describe and explain the applications of rock physics for reservoir characterization, formation evaluation, and field monitoring
  • Identify and evaluate existing and potential technologies applicable to rocks physics and rock mechanics for reservoir/formation studies
  • Identify, list, and describe the physical properties of rock, and relate these properties to the mechanical behavior of rocks
  • interpret and predict the effect of mineral properties (e.g. clay minerals) on the load-bearing capacity and strength of rocks
  • Integrate and model elastic wave propagation, electrical conductivity, and fluid flow in rocks
  • Evaluate and assess errors in experimental data, uncertainty, and the value of theoretical models
  • Develop expertise in rock physics interpretations of seismic and electrical conductivity to identify fluids and quantify saturations
  • Gather key strengths in rock physics interpretations by developing a broad understanding of existing or potential technology transfers between engineering and earth science fields that relate rock physics to reservoir geophysics and reservoir engineering
  • Gain knowledge and expertise to understand physical and mechanical behavior of rocks through examples of stress-dependent changes in strains, seismic velocity, electrical conductivity, and pore structure
  • Interpret rock physics and rock mechanics data and model elastic wave propagation, electrical conductivity, and fluid flow in rocks
  • Assess errors in experimental data, assess the uncertainty and the value of rock physics models
  • These learning objectives will allow geoscientists and engineers to:
  • Distinguish major trends in and control factors for velocity and impedance changes in the subsurface
  • Describe and evaluate velocity and impedance data for changes in fluids and stresses
  • Apply basic rock physics techniques to evaluate reservoirs
  • Identify and select the best practice workflows when using rock physics for seismic interpretations
  • Analyze complex conductivity data to interpret reservoir properties

 

Abstract

Rock physics is an interdisciplinary branch of geophysics that explains geophysical remote sensing data, such as seismic wave velocities and electrical conductivity, in the context of mineralogy, fluid content, and environmental conditions. Thus, rock physics interpretations often require inputs from physics, geology, chemistry, chemical engineering, and other fields. For example, seismic waves travel faster in cemented rocks than in loose sediments. Since the physical behavior of rocks controls their seismic response, rock physics brings key knowledge that helps with the interpretation of rock properties such as porosity, permeability, texture, and pressure. Rock physics combines indirect geophysical data (such as seismic impedance, sonic log velocities, and laboratory measurements) with petrophysical information about porosity, fluid type, and saturation for use in reservoir characterization, evaluation, and monitoring. Typically, rock physics is used by petroleum engineers doing reservoir simulations, geologists evaluating over-pressures and making basin models, and anyone doing a monitoring survey to map fluids from 4D seismic. For all such purposes, an understanding of wave propagation is required to relate seismic properties (e.g. velocity and attenuation) to the physical properties of rocks and to evaluate seismic data in terms of subsurface petrophysical parameters.  For example, an application of rock physics is seen in 4D seismic data (i.e. repeated seismic data acquired from the same field), where fluid saturation changes are evaluated from changes in velocity using fluid substitution models. Another rock physics application is to understand and predict the effect of clay minerals on the load-bearing capacity and strength of rocks using fundamental knowledge about the properties of clay minerals (e.g. CEC, surface area, dispersability, charge, sorption, plasticity, etc.), the clay water content, as well as the effects of their distribution within the rock. Thus, an effective prediction of rock properties from indirect measurements requires a solid understanding of the physical behavior of rocks under in situ conditions of pore and confining pressures and fluid saturations.

During this one-day short course, I will provide the earth scientist and engineer with a foundation in rock physics to describe the physical processes that govern the response of rocks to the external stresses essential for reservoir characterization. The course will also offer practical guidance to help better analyze existing data. A major goal of this course is to offer practical instruction and provide working knowledge in the areas of rock physics and rock mechanics for rock characterization.

VIC Technical Lunch - Muon GeoTomography

Wednesday, April 17, 2019
12:00
14:00

AMIRA International, the ASEG and AusIMM have teamed up to arrange a special lunchtime meeting on the 17th of April 2019, at which the exciting new geophysical technique of Muon GeoTomography will be presented by Don Furseth, the CEO of CRM.

 

Lunch will be held at the Kelvin Club from noon and is a paying event.

 

You will find event details as well as an abstract and a speaker bio on the Evenbrite link below.

 

https://www.eventbrite.com.au/e/aseg-amira-ausimm-technical-lunch-tickets-59748190446

 

Please RSVP on Eventbrite before the 12/04/2019 COB.

 

Abstract

Muon GeoTomography is a new geophysical technique providing 3D density imaging and monitoring using naturally-occurring cosmic ray muons. Unlike other geophysical techniques, muon geotomography provides straight line imaging (enabling accurate 3D localization), is passive (using naturally-occurring cosmic ray muons), is impervious to mechanical or electrical noise, and can see through conductive cover.

CRM GeoTomography Technologies (CRM) based in Canada, is commercialising the technology and has detectors in the field:

• Large (for brownfield applications)

• Compact (for submerged/other locations)

• Borehole - Detectors for HQ boreholes are in development, with field trials expected in early 2020.

CRM has published successful results for:

• A VMS deposit (zinc/lead/copper/silver) under rugged terrain (Myra Falls, BC, Canada / Nyrstar),

• A MVT deposit ( zinc/lead/other) at 450 m depth (Pend Oreille, Washington, USA / Teck), and

• A high-grade Uranium deposit at 600 m depth (McArthur River, Canada / Orano & Cameco).

Other applications include:

• Brownfield and greenfield mineral exploration;

• Block cave (air gap) monitoring; detection of voids and old workings;

• Other 3D density imaging and monitoring applications for resources/industrial, safety and security.

 

Bio

Don is an engineering physicist and entrepreneur with 30+ years of experience commercializing advanced, multi-disciplinary technology, with an emphasis on imaging and remote sensing. With engineering degrees from the University of British Columbia and Simon Fraser University, Don has worked in a variety of roles ranging from applied research, to product development, product management, operations and executive roles. Technologies have spanned photonics, satellite remote sensing, synthetic aperture radar, other imaging technologies, systems engineering and most recently muon geotomography. In recent years, Don has led a team to commercialise muon geotomography - a 3D density imaging and monitoring technology that can help exploration geologist discover, and deliver other new 3D insights.

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