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Rock typing of diagenetically induced heterogeneities – A case study from a deeply-buried clastic Rotliegend reservoir of the Northern German Basin

Monsees, Alexander C.; Busch, Benjamin; Schöner, Nadine; Hilgers, Christoph

Abstract:
Reservoir quality of sandstones is mainly derived from their permeability and porosity. As a result, porosity-reducing processes need to be understood in order to evaluate and model reservoir quality in sandstones. This case study from a Rotliegend gas reservoir in the Northern German Basin utilizes petrophysical measurements in conjunction with petrography in order to assess reservoir qualities and define rock types. The most significant diagenetic factors influencing the development of the IGV (intergranular volume) are quartz cementation due to low illite grain coating coverages on grain to IGV interfaces and chemical compaction due to pronounced illite grain coating coverages on grain to grain interfaces. Where large proportions of the interface between adjacent grains are coated by illite, stronger chemical compaction (pressure dissolution) was observed to occur. This chemical compaction reduces the IGV, and thus open pore space.

Permeabilities measured under decreasing confining pressures from 50 to 2 MPa were used to determine the pressure sensitivities of permeability (David et al., 1994), which ranged from 0.005 to 0.22 MPa−1. ... mehr


Postprint §
DOI: 10.5445/IR/1000104723
Veröffentlicht am 01.06.2021
Originalveröffentlichung
DOI: 10.1016/j.marpetgeo.2019.104163
Scopus
Zitationen: 6
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2020
Sprache Englisch
Identifikator ISSN: 0264-8172
KITopen-ID: 1000104723
Erschienen in Marine and petroleum geology
Verlag Elsevier
Band 113
Seiten Art.-Nr.: 104163
Vorab online veröffentlicht am 06.12.2019
Nachgewiesen in Dimensions
Web of Science
Scopus
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