Print Email Facebook Twitter The role of detrital anhydrite in diagenesis of aeolian sandstones (Upper Rotliegend, The Netherlands): Implications for reservoir-quality prediction Title The role of detrital anhydrite in diagenesis of aeolian sandstones (Upper Rotliegend, The Netherlands): Implications for reservoir-quality prediction Author Henares, S. Bloemsma, M.R. Donselaar, M.E. Mijnlieff, H.F. Redjosentono, A.E. Veldkamp, H.G. Weltje, G.J. Publication year 2014 Abstract The Rotliegend (Upper Permian) reservoir interval in the Southern Permian Basin (SPB) contains low-permeability streaks corresponding to anhydrite-cemented intervals. An integrated study was conducted using core, cuttings, thin sections and well-log data from a gas exploration well and two geothermal wells that target the zone of interest. This study aims at understanding the origin and nature of these low-permeability streaks, as well as their impact on reservoir properties, and to establish a predictive model of their spatial distribution. High-resolution XRF core-scanning analysis allowed to extrapolate spot observations in thin sections to the entire core. Diagenetic history includes grain rearrangement and anhydrite, haematitic clay coatings, dolomite rims, quartz overgrowths, kaolinite and second-generation carbonates as cementing phases. Coupling of all data reveals the detrital origin of the anhydrite/gypsum grains which were deposited together with the coarse-grained sand fraction in an aeolian sandflat environment. Such partially or completely dissolved grains acted as local sources of anhydrite cement and as nuclei for precipitation, explaining its preferential occurrence in coarsegrained laminae. Thick gypscretes in the vicinity likely supplied the anhydrite/gypsum grains. A conceptual model is proposed, including the location of nearby gypscretes and the prevailing west-southwest aeolian transport direction on the southern rim of the SPB Subject Earth / EnvironmentalAGEA - Advisory Group for Economic Affairs SGE - Sustainable Geo EnergyELSS - Earth, Life and Social SciencesGeological Survey NetherlandsGeosciencesEnergy / Geological Survey NetherlandsRotliegendGeothermal wellsDetrital anhydrite/gypsumLow-permeability streaksPalaeogeography To reference this document use: http://resolver.tudelft.nl/uuid:6e71e7eb-f0f6-4a37-9994-3e81ed72dbba TNO identifier 519725 Source Sedimentary Geology, 314, 60-74 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.