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ASEG SA/NT Branch Industry Night

Tuesday, October 25, 2016
Drinks and food from 5.30pm, Presentation from 6.15pm
TBD

The upcoming ASEG SA/NT Branch Technical Evening will be the 2016 Industry Night with presentations from our valued sponsors. This is a fantastic opportunity to hear about some of the projects our sponsors have undertaken over the previous year, and what they might have in store. 

Title: 2016 Industry Night

When: Tuesday, October 25th , 2016
Time: Drinks and food from 5:30 pm, presentation from 6:15 pm
Where: Coopers Alehouse, 316 Pulteney St, Adelaide

Cost: Members free, Non-members $10, Students $2 (No bookings required)

Please don’t miss out on this great educational and networking opportunity for student, industry, consultant, research and government geophysicists alike. 

Please click here for the event flier. No registration is required.

ASEG SA/NT - Melbourne Cup Luncheon 2016

Tuesday, November 1, 2016
12:00
17:00

Click on the flier to register online

2016 SEG/AAPG Distinguished Lecturer

Tuesday, September 27, 2016
17:30
19:00

Title: Mapping Gas Hydrates using Electromagnetic Methods
Presenter: Prof. Steven Constable
When: Tuesday 27th of September, 2016
Time: Drinks and food from 5:30 pm, presentation from 6:15 pm
Where: Coopers Alehouse, 316 Pulteney St, Adelaide

About the talk:

Gas hydrate is found globally on the continental shelves and is important as an unconventional hydrocarbon source, a hazard to drilling and seafloor infrastructure, a potential source of potent greenhouse gas, and a confounding resistor in the interpretation of conventional marine EM data. Yet, estimates of global hydrate volume vary by three orders of magnitude and identified recoverable reserves are rare, the reason being that it is difficult to image hydrate using seismic methods alone. However, gas hydrate is highly resistive and presents a good EM target at high saturations. Conventional controlled-source EM (CSEM) methods can be used to image hydrate, but are inefficient because seafloor receivers need to be closely spaced to achieve the appropriate resolution in the upper hundreds of meters of the seafloor. Several groups, including Scripps Institution of Oceanography, have developed towed CSEM systems designed to map hydrate in deep water, and such equipment is now being used commercially to image hydrate with a potential for methane production. In this lecture I will describe marine gas hydrate, laboratory studies of its electrical properties, and the equipment that we use to image it, with case studies from offshore California and the Gulf of Mexico.

About the presenter:

Steven Constable studied geology at the University of Western Australia, graduating with first class honours in 1979. In 1983 he received a Ph.D. in geophysics from the Australian National University for a thesis titled “Deep Resistivity Studies of the Australian Crust” and later that year took a postdoc position at the Scripps Institution of Oceanography, University of California San Diego, where he is currently Professor of Geophysics. Steven is interested in all aspects of electrical conductivity, and has made contributions to inverse theory, electrical properties of rocks, mantle conductivity, magnetic satellite induction studies, global lightning, and instrumentation. However, his main focus is marine electromagnetism; he played a significant role in the commercialization of marine EM for hydrocarbon exploration, work that was recognized by the G.W. Hohmann Award in 2003, the 2007 SEG Distinguished Achievement Award, and now the SEG 2016 Reginald Fessenden Award. He also received the R&D 100 Award in 2010, and the AGU Bullard Lecture in 2015. More recent efforts have involved the development of equipment to map gas hydrate and permafrost. Steven has served as an associate editor for the journal Geophysics, as a section secretary and corresponding editor for the American Geophysical Union, and on the MARELEC steering committee.

Please click here for the event flier.

SEG DISC: SA 2016

Sunday, August 21, 2016
7:00 am
7:00 pm

3C Seismic and VSP: Converted Waves and Vector Wavefield Applications

http://shop.seg.org/Default.aspx?TabId=177&ProductId=7454116

Abstract

3C seismic applications provide enhanced rock property characterization of the reservoir that can complement P-wave methods. The continued interest in converted P- to S-waves (PS-waves) and vertical seismic profiles (VSPs) has resulted in the steady development of advanced vector wavefield techniques. Shear waves are coupled with P-waves, and although they do not respond to fluid properties of the medium they are nevertheless very sensitive to anisotropy and provide direct estimates of shear moduli (rigidities).  When the full elastic response is recorded in a VSP survey, vertical components of the wavefield are obtained to calibrate surface 3C seismic data in depth. PS-wave images along with VSP data can be used to help P-wave interpretation of structure in gas obscured zones, of S-wave impedance and density characterization in unconventional reservoirs for lithology and elastic property discrimination, and of fracture characterization and stress monitoring from S-wave birefringence analysis. The course will give an overview of 3C seismic theory and practical application: from fundamentals of PS-waves and VSPs, through to acquisition and processing including interpretation techniques. The emphasis will be on unique aspects of vector wavefields, anisotropy, and the important relationships that unify S-waves and P-waves. Various applications and case studies will demonstrate image benefits from PS-waves, elastic properties from joint inversion of amplitude variations with offset/angle (AVO/A), and VSP seismic methods for improved reservoir characterization.

Course Objectives

Students will obtain an understanding of theoretical and practical aspects of 3C seismic and VSP, including how to use PS-wave and vector wavefield data to improve rock property applications, as well as:

  • Basics of PS-wave registration, velocities and birefringence (S-wave splitting).
  • Elastodynamic processes that generate converted waves and how they relate to elastic rock properties
  • Issues of PS-wave asymmetry and illumination, and how 3C surface and VSP wavefields are related
  • Unique characteristics of PS-wave processing: time registration with P-waves, S-wave splitting,VP/VS analyses, velocities, and conversion-point gathering.
  • Identifying and accounting for potential vector infidelity effects
  • Interpretation of converted-wave and VSP wavefields
  • Applications of 3C seismic and VSP data for migration and elastic impedance inversion, imaging through gas, fracture/stress characterization, and time-lapse.
Who Should Attend

The course is intended for geophysicists, geologists and engineers. The emphasis is on practical understanding and application of vector wavefields, thus a basic prerequisite knowledge of P-waves is assumed. The course would be most relevant to those currently involved with, or considering the use of AVO/A inversion, fracture/stress characterization analyses, or interpretation in gas-obscured reservoirs.

Summary

The following topics will be addressed in the course:

Introduction:

Definitions and wavefield properties of 3C seismic and VSP data are covered, including anisotropy, coordinate systems, vector wavefields, and S-wave applications.  Challenges our industry has faced in the development of S-wave technology are reviewed to obtain a perspective of the current PS-wave emphasis. 

S-waves and VSP in the 20th century:

An overview of the history and development of S-wave and VSP technology in the 20th century is discussed, including S-wave source development, the influence from P-wave AVO, and the emphasis on vertical transverse isotropy (VTI) and azimuthal anisotropy. Also, the early development of PS-wave and VSP technology is reviewed.

Fundamentals:

A tutorial of the elastodynamic theory of PS-wave generation is described, along with reflection and transmission coefficients, coordinate systems, and polarity standards.  Conversion-point illumination, modeling and interpretation of 3C seismic and VSP, NMO velocity in anisotropic media, and the resolution of PS-waves are also reviewed.

Acquisition:

Basic source radiation patterns, free surface and seabed responses to P- and S-wave arrivals are described as well as source, receiver, and VSP systems. Various 3C acquisition configurations are examined in terms of PS-wave illumination, minimal datasets, and common-offset vector (COV) gathers, including VSP geometries.

Processing and Analysis:

Unique 3C processing steps such as rotation, S-wave statics and splitting analyses are emphasized in addition to noise attenuation, vector infidelity corrections, elastic-wavefield decomposition, common conversion-point gathering, and VP/VS analyses.  Essentials of VSP wavefield separation, anisotropic velocity analyses, and conventional processing are described along with interferometry application.

Imaging and Inversion Applications:

Applications of PS-wave seismic demonstrating anisotropic imaging, velocity model building, and tomography are presented in addition to case studies imaging through gas, and imaging with VSP. Also, various inversion applications are presented: layer stripping for fracture/stress properties and joint AVO/A for rock properties, including unconventional reservoir, microseismic imaging, and time-lapse applications. Current research directions of 3C seismic and VSP include investigations using reverse-time migration, AVAz and full-waveform inversion, near surface velocity model building, distributed acoustic sensing, and rotational sensors.  Business model considerations are discussed along with improving the economic viability of 3C seismic and VSP to increase productivity, and to reduce processing costs and turnaround times.

EAGE Education Tour - Gravity and Magnetic Methods for Oil & Gas and Mineral Exploration and Production

Thursday, August 25, 2016
7:00am
7:00pm

EAGE EDUCATION TOUR - GRAVITY AND MAGNETIC METHODS FOR OIL & GAS AND MINERAL EXPLORATION AND PRODUCTION

 

ASEG-PESA-AIG 2016 conference Workshop

http://www.conference.as

Presenter

Dr. Yaoguo Li, Colorado School of Mines - Denver, USA

Venue

Grosvenor Hotel Adelaide

Target Audience

We anticipate the geoscientists in the following areas will benefit from the course:

  • Potential-field methods
  • Mineral exploration interpretation
  • Integrate
  • Reservoir monitoring
  • Groundwater hydrology

Cost

EAGE member $120, non-member $240

Gravity and magnetic data are among the oldest geophysical data acquired for the purpose of resource exploration and exploitation. They currently also have the widest areal coverage on the Earth, span a great range of scales, and play important roles in mineral, energy, and groundwater arenas. The interpretation methods have evolved from data map-based visual inspection, various map enhancements, and depth estimation, to quantitative interpretations based on inversions and integrated modeling. In particular, 3D inversion techniques have emerged as a major component in this evolution. The availability of 3D inversion techniques has advanced potential-field interpretation from 'anomaly bump hunting' to 3D imaging of the subsurface by reconstructing the distribution of density or magnetic properties in various geological units and, thereby, have shifted interpretations from the data domain to the model domain. Similarly, inversion techniques are also poised to make major contributions to integrated modeling and interpretation, as well as to differentiating and characterizing geology, geological processes, and reservoir dynamics. This course will focus on the methodology, numerical computation, solution strategy, and applications of 3D physical property inversions of gravity and magnetic data sets. The course is designed to have two tracks in order to meet the different needs of EAGE community in mineral exploration and in oil & gas exploration and production. We achieve this by dividing the course into two parts, and cover the methodologies common in potential-field methods in Part-I and discuss tools and applications specific to mineral exploration or oil & gas reservoir monitoring in Part-II.

Read full course details here http://lg.eage.org/index.php?evp=16250

ASEG-PESA-AIG 2016: 25th Geophysical Conference and Exhibition

Saturday, August 20, 2016
7:00 am
7:00 pm

On behalf of the Organising Committee, we would like to invite you to attend the ASEG-PESA-AIG 2016: 25th Geophysical Conference and Exhibition in Adelaide, South Australia, to be held from August 21-24, 2016.

The conference’s mixture of international and local speakers, in-depth educational offerings, and important delegate opportunities for contribution and discussion make it a “must attend” event for all in the geophysical and geological community.
http://www.conference.aseg.org.au

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