Mapping of alteration zones with seismic-amplitude data and well logs in the hard-rock environment of the Keefe Lake area, Athabasca Basin, Canada

Erno Takacs, Z. Hajnal, Bhaskar Pandit, Irvine R. Annesley

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Abstract Optical televiewer (OTV) and full-wave sonic (FWS) data sets acquired in two boreholes from the Keefe Lake property of Atom Energy Inc. (AEI) provided a unique opportunity to study the lithologic units through analysis of P-and S-wave velocities and elastic rock properties derived from them (Poisson's ratio, lambda, and mu). This approach is a first attempt to describe petrophysical properties for the sandstone sediments and underlying crystalline Proterozoic rocks of the eastern Athabasca Basin. Wireline measurements penetrated through the entire (180-m) thickness of the basin fill and deep into the basement (357 m and 552 m), intersecting several fracture and alteration zones. Such zones are considered possible locations of uranium mineralization in the Athabasca Basin. Seismic attributes (amplitude envelope and cosine instantaneous phase) can be used in the hard-rock environment. The characteristic values of fracture and alteration zones can by analyzed by crossplotting the elastic properties derived from the FWS data. After insertion of the elastic-property logs into the closest seismic section, the probable spatial extents of three anomalous zones revealed in the vicinity of the boreholes are investigated. The results of amplitude-variation-with-offset (AVO) modeling carried out based on petrophysical properties obtained from the basement show that clay-filled fracture zones in the hard-rock environment of the study area are associated with increasing, anomalous AVO responses.

Original languageEnglish
Pages (from-to)530-538
Number of pages9
JournalLeading Edge (Tulsa, OK)
Volume34
Issue number5
DOIs
Publication statusPublished - 2015

Fingerprint

hard rock
Canada
lakes
rocks
well
elastic property
lake
basin
boreholes
basements
borehole
elastic properties
basin fill
Poisson ratio
rock property
fracture zone
P-wave
wave velocity
S-wave
sandstones

ASJC Scopus subject areas

  • Geology

Cite this

Mapping of alteration zones with seismic-amplitude data and well logs in the hard-rock environment of the Keefe Lake area, Athabasca Basin, Canada. / Takacs, Erno; Hajnal, Z.; Pandit, Bhaskar; Annesley, Irvine R.

In: Leading Edge (Tulsa, OK), Vol. 34, No. 5, 2015, p. 530-538.

Research output: Contribution to journalArticle

@article{b4ba4098d10f4e219974b04945d0f769,
title = "Mapping of alteration zones with seismic-amplitude data and well logs in the hard-rock environment of the Keefe Lake area, Athabasca Basin, Canada",
abstract = "Abstract Optical televiewer (OTV) and full-wave sonic (FWS) data sets acquired in two boreholes from the Keefe Lake property of Atom Energy Inc. (AEI) provided a unique opportunity to study the lithologic units through analysis of P-and S-wave velocities and elastic rock properties derived from them (Poisson's ratio, lambda, and mu). This approach is a first attempt to describe petrophysical properties for the sandstone sediments and underlying crystalline Proterozoic rocks of the eastern Athabasca Basin. Wireline measurements penetrated through the entire (180-m) thickness of the basin fill and deep into the basement (357 m and 552 m), intersecting several fracture and alteration zones. Such zones are considered possible locations of uranium mineralization in the Athabasca Basin. Seismic attributes (amplitude envelope and cosine instantaneous phase) can be used in the hard-rock environment. The characteristic values of fracture and alteration zones can by analyzed by crossplotting the elastic properties derived from the FWS data. After insertion of the elastic-property logs into the closest seismic section, the probable spatial extents of three anomalous zones revealed in the vicinity of the boreholes are investigated. The results of amplitude-variation-with-offset (AVO) modeling carried out based on petrophysical properties obtained from the basement show that clay-filled fracture zones in the hard-rock environment of the study area are associated with increasing, anomalous AVO responses.",
author = "Erno Takacs and Z. Hajnal and Bhaskar Pandit and Annesley, {Irvine R.}",
year = "2015",
doi = "10.1190/tle34050530.1",
language = "English",
volume = "34",
pages = "530--538",
journal = "Leading Edge",
issn = "1070-485X",
publisher = "Society of Exploration Geophysicists",
number = "5",

}

TY - JOUR

T1 - Mapping of alteration zones with seismic-amplitude data and well logs in the hard-rock environment of the Keefe Lake area, Athabasca Basin, Canada

AU - Takacs, Erno

AU - Hajnal, Z.

AU - Pandit, Bhaskar

AU - Annesley, Irvine R.

PY - 2015

Y1 - 2015

N2 - Abstract Optical televiewer (OTV) and full-wave sonic (FWS) data sets acquired in two boreholes from the Keefe Lake property of Atom Energy Inc. (AEI) provided a unique opportunity to study the lithologic units through analysis of P-and S-wave velocities and elastic rock properties derived from them (Poisson's ratio, lambda, and mu). This approach is a first attempt to describe petrophysical properties for the sandstone sediments and underlying crystalline Proterozoic rocks of the eastern Athabasca Basin. Wireline measurements penetrated through the entire (180-m) thickness of the basin fill and deep into the basement (357 m and 552 m), intersecting several fracture and alteration zones. Such zones are considered possible locations of uranium mineralization in the Athabasca Basin. Seismic attributes (amplitude envelope and cosine instantaneous phase) can be used in the hard-rock environment. The characteristic values of fracture and alteration zones can by analyzed by crossplotting the elastic properties derived from the FWS data. After insertion of the elastic-property logs into the closest seismic section, the probable spatial extents of three anomalous zones revealed in the vicinity of the boreholes are investigated. The results of amplitude-variation-with-offset (AVO) modeling carried out based on petrophysical properties obtained from the basement show that clay-filled fracture zones in the hard-rock environment of the study area are associated with increasing, anomalous AVO responses.

AB - Abstract Optical televiewer (OTV) and full-wave sonic (FWS) data sets acquired in two boreholes from the Keefe Lake property of Atom Energy Inc. (AEI) provided a unique opportunity to study the lithologic units through analysis of P-and S-wave velocities and elastic rock properties derived from them (Poisson's ratio, lambda, and mu). This approach is a first attempt to describe petrophysical properties for the sandstone sediments and underlying crystalline Proterozoic rocks of the eastern Athabasca Basin. Wireline measurements penetrated through the entire (180-m) thickness of the basin fill and deep into the basement (357 m and 552 m), intersecting several fracture and alteration zones. Such zones are considered possible locations of uranium mineralization in the Athabasca Basin. Seismic attributes (amplitude envelope and cosine instantaneous phase) can be used in the hard-rock environment. The characteristic values of fracture and alteration zones can by analyzed by crossplotting the elastic properties derived from the FWS data. After insertion of the elastic-property logs into the closest seismic section, the probable spatial extents of three anomalous zones revealed in the vicinity of the boreholes are investigated. The results of amplitude-variation-with-offset (AVO) modeling carried out based on petrophysical properties obtained from the basement show that clay-filled fracture zones in the hard-rock environment of the study area are associated with increasing, anomalous AVO responses.

UR - http://www.scopus.com/inward/record.url?scp=84928940202&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928940202&partnerID=8YFLogxK

U2 - 10.1190/tle34050530.1

DO - 10.1190/tle34050530.1

M3 - Article

VL - 34

SP - 530

EP - 538

JO - Leading Edge

JF - Leading Edge

SN - 1070-485X

IS - 5

ER -