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Controls on compactional behavior and reservoir quality in a Triassic Buntsandstein reservoir, Upper Rhine Graben, SW Germany

Busch, Benjamin; Adelmann, Dirk; Herrmann, Rolf; Hilgers, Christoph

Abstract (englisch):
The main reservoir quality controls in Triassic Buntsandstein deposits in the Upper Rhine Graben and surrounding outcrops in Germany and France are discussed to be authigenic mineral precipitates and the vicinity to structural elements (faults and fractures). To better understand reservoir quality controls in this lithology, a detailed diagenetic study based on petrographic methods (optical and SEM) in combination with petrophysical measurements (porosity and permeability) on core material (1133–1591 m TVD) was initiated. This case study highlights that large detrital grain sizes and low compactional porosity loss in association with blocky authigenic cements such as quartz and dolomite are beneficial to reservoir quality, whereas variable illite textures have a dual, but opposite effect on reservoir qualities. Grain coating illite (tangential and radial) may preserve intergranular porosity by inhibition of syntaxial quartz precipitation, while at the same time, if present at grain contacts, tangential illite enhances chemical compaction and reduces the available intergranular volume. The presence of early diagenetic carbonate cemented nodules is also beneficial for reservoir quality in stabilizing the grain framework against compactive porosity loss. ... mehr

DOI: 10.1016/j.marpetgeo.2021.105437
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 0264-8172
KITopen-ID: 1000140307
Erschienen in Marine and petroleum geology
Verlag Elsevier
Seiten Art.-Nr.: 105437
Vorab online veröffentlicht am 13.11.2021
Schlagwörter Buntsandstein; Reservoir quality; Compaction; Quartz cements; Diagenesis; Illite grain-coatings; Dolomite-siderite nodules; Upper Rhine Graben
Nachgewiesen in Scopus
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