A5011596041- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Geophysical Methods and Applications
- High-pressure geophysics and materials
- Ultrasonics and Acoustic Wave Propagation
- Seismology and Earthquake Studies
- Geological Modeling and Analysis
- Rock Mechanics and Modeling
- 3D Surveying and Cultural Heritage
- Geophysics and Sensor Technology
- Geological and Geochemical Analysis
- Geophysical and Geoelectrical Methods
- Image Processing and 3D Reconstruction
- Geological and Geophysical Studies
- Atmospheric Ozone and Climate
- earthquake and tectonic studies
- Spectroscopy and Laser Applications
- Tunneling and Rock Mechanics
- NMR spectroscopy and applications
- Maritime and Coastal Archaeology
- BIM and Construction Integration
- Atmospheric and Environmental Gas Dynamics
- Flow Measurement and Analysis
BHP Laboratories
2019-2023
BHP (Australia)
2018-2021
University of Alberta
2009-2020
University of Antofagasta
2019
Novel laboratory equipment has been modified to allow both torsional and flexural oscillation measurements at sub-microstrain amplitudes, thereby providing seismic-frequency constraints on the shear compressional wave properties of cylindrical rock specimens within linear regime. The new mode capability tested experimental assemblies containing fused silica control specimens. Close consistency between data results numerical modelling with finite-difference finite-element methods demonstrates...
Seismic velocity anisotropy measurements are made of a fractured metamorphic formation from the 2.5-km-deep International Continental Scientific Drilling Programme (ICDP) borehole in Outokumpu, Finland. Three component walk-away vertical seismic profile (VSP) along two source-line azimuths at three receiver depths (1000, 1750 and 2500 m) incidence angle-dependent qP- qS-wave velocities extracted with τ-p method. The highest qP-wave anisotropy, 13.6 per cent (vfast = 6160 m s-1, vslow 5370...
ABSTRACT A traveltime inversion technique is applied to model the upper ∼40 m of subsurface a glaciated shield rock area in order calculate static corrections for multi‐azimuth multi‐depth walk‐away vertical seismic profile and surface reflection profile. First break information from refraction survey used conjunction with ray‐tracing program an iterative damped least‐squares algorithm create two‐dimensional subsurface. The layout required crooked lines substantial gaps source receiver...
In the field, seismic waves used for active-source imaging typically contain frequencies from 10 to about 100 Hz, with corresponding wavelengths of tens meters. This contrasts greatly ultrasonic (∼ 1-MHz) wave-speed measurements carried out in laboratory, millimeter wavelengths. The purpose laboratory is, course, provide insight into wave speeds situ. However, presence a pore fluid, velocity are sensitive frequency at which data collected. A study focuses on such fluid-flow-related...
Abstract The effect of pore fluids on acoustic wave dispersion in rocks with low aspect ratio crack porosity is important for the interpretation laboratory and field observations hard rock mineral exploration environments. Here we make measurements shear modulus at frequencies 0.01–1 Hz 1 MHz different saturating (dry, argon, water saturated) two thermally cracked quartzite samples ~2% total porosity. Measurements are made across a range effective pressures (10–150 MPa), resulting very...
Seismic is often inferred to be synonymous with high cost. In a mineral environment, it typically assumed viable only for mining operations or brownfield exploration. For greenfield exploration, other geophysical and geochemical/lithogeochemical methods are usually preferred, due in part their affordability. We show results of low-cost seismic survey over the Escondida porphyry copper deposit. The that 3D acquisition can improve structural understanding established deposits there potential...
Purple Crow Lidar (PCL) measurements of the vibrational Raman-shifted backscatter from water vapour and nitrogen molecules allows height profiles water-vapour mixing ratio to be measured 500 m up into lower stratosphere. In addition, Raman allow determination temperature about 10 40 km altitude. However, external calibration these is necessary compensate for instrumental effects, uncertainties in our knowledge relevant molecular cross sections, atmospheric transmission. A comparison...
PreviousNext No AccessThird International Meeting for Applied Geoscience & Energy Expanded AbstractsSparse 3D seismic survey over the Olympic Dam IOCG depositAuthors: Heather SchijnsJared TownsendDavid HaddowMax ShawcrossKathy EhrigHeather SchijnsBHP, Jared TownsendBHP, David HaddowBHP, Max ShawcrossBHP, and Kathy EhrigBHPhttps://doi.org/10.1190/image2023-3908343.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions...
Summary3D seismic is routinely used for structural characterisation underground coal operations, however the implementation of this technology shallow, open-cut resources has been limited. The perceived high cost shallow 3D one main factors holding it back. This paper will demonstrate that by adopting and adapting best practice technologies from petroleum industry, not only effective but also delivers higher confidence resource knowledge compared to traditional pattern grid surface drilling....
Reversible fluid flow within low aspect ratio cracks is expected to cause seismic velocities in hard rock be strongly frequency dependent. Experimental measurements are necessary constrain theoretical velocity dispersion models order allow comparisons between laboratory at megahertz frequencies, sonic logging kilohertz frequencies and in-situ exploration typically 10-300 Hz but rare due the complexity of on core samples. Quartzite samples from Cape Sorell, Australia Alberta, Canada thermally...
SummaryThe capability to perform laboratory measurements with both low-frequency forced-oscillation and high-frequency wave-propagation methods, under conditions of independently controlled confining pore-fluid pressure, offers the prospect new insight into frequency-dependent seismic properties expected cracked fluid-saturated rocks Earths upper crust. An important step in development such broad-band has been modification existing equipment newly allow flexural, as well torsional, testing...
Hood 10 is a small polymetallic (Cu - Zn) VHMS mineral deposit located in the Archean aged Slave Craton arctic Canada, and 100% owned by MMG Ltd. The hosted Napaktulik volcanic belt, bimodal greenstone belt of approximately 2.67 Ga age. was initially discovered early 1970’s Texas Gulf covered with airborne ground frequency domain EM (FDEM) magnetics. property has changed hands several times over intervening years, drill programs mid 1970’s, 1980’s 1990’s resulting non-JORC compliant resource...
In order to assist in determining detailed structure of bedrock nearby the Outokumpu deep drill hole and combine straight measurements done surface measurements, a zero‐offset vertical seismic profile was acquired near hole. this new survey, 2 m depth increment applied obtain high resolution information. Using first break picking, interval P‐wave velocities were determined that match sonics well. And from stack result, it showed information about sequence which also can be used for...
PreviousNext No AccessSEG Technical Program Expanded Abstracts 2010Anisotropy of fractured mica‐rich schist from Outokumpu, Finland: VSP measurements, laboratory measurements and theoretical modelAuthors: Heather SchijnsDouglas R. SchmittPekka HeikkinenIlmo T. KukkonenHeather SchijnsUniversity AlbertaSearch for more papers by this author, Douglas SchmittUniversity Pekka HeikkinenUniversity HelsinkiSearch Ilmo KukkonenGeological Survey FinlandSearch authorhttps://doi.org/10.1190/1.3513800...
SummaryIn mining areas with limited previous seismic acquisition, 2D lines are often acquired to determine viability of the method and optimal survey parameters in advance a more comprehensive 3D survey. Consideration design acquisition strategy can allow additional value be leveraged from nominally data. At Escondida, four were processed yield pseudo-3D volume over portion area, allowing improved structural interpretation above what could achieved imaging alone.
The glacio-fluvial sediments of the Whataroa Valley on west coast New Zealand's South Island contain a record environmental change since Last Glacial Maximum. valley is cut by Australia–Pacific plate-bounding Alpine Fault, position which obscured recent outwash deposits. Five seismic profiles collected across inferred surface trace Fault between 2011 and 2018, using variety source types, are presented here; these provide constraints fault's location in upper few hundred metres near surface....
Lattice and shape preferred orientation of minerals, along with aligned fractures microcracks, is expected to cause significant seismic velocity anisotropy in crystalline rocks. As surveys hard rock environments become more common, quantifying accounting for this processing becomes increasingly important.Outokumpu, Finland the site a historic base metal mine classical ore province known its Cu-Co- Zn sulphide deposits. The 2.5 km deep ICDP borehole shows lithology area Outokumpu 2006 2D...