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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 (&lt;1 mD), whereas the mixed mud–sand intertidal facies (FA1) have the poorest properties (porosity 6 %; permeability &lt;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 (&gt;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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 (&lt;1 mD), whereas the mixed mud–sand intertidal facies (FA1) have the poorest properties (porosity 6 %; permeability &lt;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 (&gt;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF AFRICAN EARTH SCIENCES

ISSN

1464-343X

e-ISSN

1879-1956

Svazek periodika

233

Číslo periodika v rámci svazku

JAN

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

"105880-1"-"105880-16"

Kód UT WoS článku

001594448900001

EID výsledku v databázi Scopus

2-s2.0-105018092939