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@article{1580356,
author = {Šimíček, Daniel and Bábek, Ondřej},
article_location = {Oxford},
article_number = {FEB},
doi = {http://dx.doi.org/10.1016/j.marpetgeo.2014.10.010},
keywords = {Gamma-ray spectra; Sandstone petrography; Facies analysis; Sequence stratigraphy; Correlation},
language = {eng},
issn = {0264-8172},
journal = {Marine and Petroleum Geology},
title = {Spectral gamma-ray logging of the Gres d'Annot, SE France: An outcrop analogue to geophysical facies mapping and well-log correlation of sand-rich turbidite reservoirs},
url = {https://www.sciencedirect.com/science/article/pii/S0264817214003213},
volume = {60},
year = {2015}
}
TY - JOUR
ID - 1580356
AU - Šimíček, Daniel - Bábek, Ondřej
PY - 2015
TI - Spectral gamma-ray logging of the Gres d'Annot, SE France: An outcrop analogue to geophysical facies mapping and well-log correlation of sand-rich turbidite reservoirs
JF - Marine and Petroleum Geology
VL - 60
IS - FEB
SP - 1-17
EP - 1-17
PB - ELSEVIER SCI LTD
SN - 02648172
KW - Gamma-ray spectra
KW - Sandstone petrography
KW - Facies analysis
KW - Sequence stratigraphy
KW - Correlation
UR - https://www.sciencedirect.com/science/article/pii/S0264817214003213
L2 - https://www.sciencedirect.com/science/article/pii/S0264817214003213
N2 - Spectral gamma-ray (GRS) logging is a powerful tool in cyclo- and sequence stratigraphy of carbonate depositional systems. In siliciclastic systems with low chemical maturity, the multi-component character of sediment complicates the interpretation of such logs. This work focuses on understand better the relationships between GRS logs and siliciclastic facies stacking patterns, using GRS measurements combined with lithology, modal composition and geochemistry. This study is focused on outcrops in the St. Antonin-Annot-Grand Coyer-Chalufy areas of the Oligocene Gres d'Annot Formation (SE France). The studied siliciclastics reveal moderately high total radioactivity and mean concentrations of K: 3.8 %, U: 4.5 ppm and Th: 13 ppm. U and Th are predominantly contained within heavy minerals and so tend to be concentrated in mudstones and heterolithic sand-mud facies whereas sandstone and conglomerate fades have slightly higher levels of K due to higher contents of K-feldspars and micas. The abundance of minerals containing radioactive elements and the relatively low compositional contrast between different fades are considered the main reasons why the standard gamma-ray measurements provide only a limited proxy for lithology in this case. Two complete regressive-to-transgressive cycles were identified based on combined Th and Th/K logs and facies stacking patterns. The cycle boundaries are marked by shifts towards coarse-grained facies, abrupt increase of U and Th concentrations and Th/K ratio within the proximal deposits at the St. Antonin section. In the distal Chalufy section, the response of the gamma-ray proxies to fades shifts is reversed. These boundaries, interpreted as basal surfaces of forced regression, can be correlated with prominent erosional surfaces at the Annot section. GRS logging is a sensitive method capable of indicating changes of genetic depositional units in sand-rich turbidite systems. However, detailed facies analysis, mineralogy and geochemistry producing the radioactive signal are necessary to correctly interpret such logs.
ER -
ŠIMÍČEK, Daniel and Ondřej BÁBEK. Spectral gamma-ray logging of the Gres d'Annot, SE France: An outcrop analogue to geophysical facies mapping and well-log correlation of sand-rich turbidite reservoirs. \textit{Marine and Petroleum Geology}. Oxford: ELSEVIER SCI LTD, 2015, vol.~60, FEB, p.~1-17. ISSN~0264-8172. Available from: https://dx.doi.org/10.1016/j.marpetgeo.2014.10.010.
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