Reservoir quality and sedimentology in shallow marine sandstones: interplay between sand accumulation and carbonate and clay minerals

Barshep, Dinfa Vincent and Worden, Richard ORCID: 0000-0002-4686-9428 (2022) Reservoir quality and sedimentology in shallow marine sandstones: interplay between sand accumulation and carbonate and clay minerals. Marine and Petroleum Geology, 135. p. 105398.

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Official URL: http://dx.doi.org/10.1016/j.marpetgeo.2021.105398

Abstract

Sedimentological studies are important in understanding and predicting reservoir quality, especially in shallow buried sandstones that are dominated by eogenetic processes. Understanding the sedimentological controls on siliciclastic depositional environments will enhance the knowledge and prediction of reservoir architecture and reservoir quality, both of which are essential to resource exploitation and future CCS and hydrogen storage projects. Here, we present a study of sedimentology and depositional mineralogy, as well as controls on the deposition of siliciclastic sandstones, from the shallow-buried, Upper Jurassic Corallian marine sandstones of the Weald Basin, UK. These sandstones host small oil accumulations and, being close to large centres of population, are possible gas storage or carbon capture and storage sites. We used wireline log analysis, high resolution core logging, optical petrography, and SEM-EDS imaging to investigate reservoir architecture and the relative importance of depositional versus secondary diagenetic controls on reservoir quality. Shallow marine conditions, adjacent to a continent experiencing a warm humid climate, are interpreted based on ichnofabrics and mineralogy. Tectonic processes influenced water depth which subsequently controlled both the quantity of detrital bioclastic material (and the resulting calcite cement), and the amount of detrital clay matrix. The eustatic influence on deposition led to the development of a relatively thin intra-Corallian mudstone which compartmentalises the reservoir into discrete upper and lower sand bodies. The results of this study underline the importance of integration of detailed sedimentological and wireline log analysis in improving the prediction of reservoir quality in tectonically active environments for shallow buried, eogenetic-dominated sandstones.

Item Type:	Article
Uncontrolled Keywords:	Weald basin, Corallian sandstone, Transgressive sandstones, Reservoir quality prediction, Eodiagenesis, Tectonism, Wireline log lithology
Divisions:	Faculty of Science and Engineering > School of Environmental Sciences
Depositing User:	Symplectic Admin
Date Deposited:	02 Nov 2021 09:03
Last Modified:	18 Jan 2023 21:25
DOI:	10.1016/j.marpetgeo.2021.105398
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3142475