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Organic - inorganic interactions between shale and sandstone and its effect on reservoir properties: a case study from the Campine basin (NE-Belgium)

Organic-inorganic interactions, which refer to the reactions that participate in alteration processes in sandstone reservoirs, have been studied in sedimentary basins for many years. These organic-inorganic interactions create or destroy the porosity and permeability of sandstone reservoirs. In this project, we will sample comparable sedimentary successions with sandstone/shale and sandstone/coal relationships that have been buried at different depth and by looking to inorganic and organic parameters to deduce which diagenetical processes that played a role in these tight sandstones. The aims of this project are (1) to investigate inorganic-organic interactions in Westphalian A & B sandstone systems and related clay/coal interlayers with sandstones that underwent different burial depths and that consist of different mineralogies, (2) to evaluate their consequences on reservoir alteration. Conducting this study has far-reaching implications for successful reservoir prediction and engineering. Formation of pore-filling minerals, such as kaolinite, dickite and/or calcite, ankerite could significantly deteriorate reservoir quality by both reducing porosity and permeability of rocks for oil/gas recovery, or for the use of these reservoirs for geothermy or CCS. In contrast, dissolution of feldspar and carbonate may produce secondary porosity that could greatly improve reservoir quality.

Date:6 Feb 2019  →  Today
Keywords:Organic-inorganic interaction, Reservoir properties, shale, Sandstone
Disciplines:Petroleum and coal geology, Inorganic geochemistry, Organic geochemistry, Sedimentology
Project type:PhD project