Impact of depositional facies and diagenetic alterations on reservoir quality tidal sandstones: Insights from the Lower Devonian Tadrart formation, the central Ghadamis basin, NW Libya
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73633885" target="_blank" >RIV/61989592:15310/25:73633885 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1464343X25003474" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1464343X25003474</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jafrearsci.2025.105880" target="_blank" >10.1016/j.jafrearsci.2025.105880</a>
Alternative languages
Result language
angličtina
Original language name
Impact of depositional facies and diagenetic alterations on reservoir quality tidal sandstones: Insights from the Lower Devonian Tadrart formation, the central Ghadamis basin, NW Libya
Original language description
This study integrates sedimentological, petrographic, geochemical, and fluid-inclusion data to assess the factors influencing reservoir quality in the Lower Devonian Tadrart Sandstone of the central Ghadamis Basin. The study reveals that reservoir quality is strongly governed by depositional facies, which exert primary control on subsequent diagenetic processes. Eogenetic alterations include mechanical compaction, the development of mixed-layer illite–smectite and kaolinite, and early precipitation of Mg-poor siderite, which is attributed to meteoric water influx during relative sea-level fall. Mesogenetic alterations are characterized by chemical compaction, pervasive quartz overgrowth cementation, dickite formation, illitization, chloritization, crystallization of euhedral pyrite and a later generation of Mg-rich siderite. The data indicate that coarse-grained tidal channel sandstones (FA4) exhibit the best reservoir quality, with an average porosity of 12 % and permeability up to 480 mD (av. 127 mD). In contrast, fine-grained intertidal sandstones (FA2–FA3) show similar porosity (12 %) but very low permeability (<1 mD), whereas the mixed mud–sand intertidal facies (FA1) have the poorest properties (porosity 6 %; permeability <0.1 mD) and are more strongly affected by diagenesis. Fluid-inclusion microthermometry reveals homogenization temperatures up to 205 °C and high-salinity brines, indicating a deep burial (>4 km) followed by uplift and dilution by meteoric waters. These results demonstrate how integrating depositional facies analysis with reconstructed diagenetic pathways clarifies the evolution of reservoir heterogeneity and provides a predictive framework for assessing sandstone reservoirs in intracratonic basins.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
N - Vyzkumna aktivita podporovana z neverejnych zdroju
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
JOURNAL OF AFRICAN EARTH SCIENCES
ISSN
1464-343X
e-ISSN
1879-1956
Volume of the periodical
233
Issue of the periodical within the volume
JAN
Country of publishing house
GB - UNITED KINGDOM
Number of pages
16
Pages from-to
"105880-1"-"105880-16"
UT code for WoS article
001594448900001
EID of the result in the Scopus database
2-s2.0-105018092939