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Seimsic attribute analysis facies architecture Emsgraben


The study focuses on the facies architecture of a Permian tight gas field in the Southern Permian
Basin, East Frisia, Germany. To improve field development, 3D seismic, wireline and core data
were compared with a reservoir analogue in the Panamint Valley, United States. Depositional
environments of the Permian Upper Rotliegend II include perennial saline lakes, coastal parallel
sand belts comprising wet, damp and dry sandflats and aeolian dunes with interdune deposits.
Polygonal patterns at different scales were observed on seismic horizon slices in the reservoir
intervals and the overlying Zechstein. Outlines of superordinate polygons coincide with interpreted
faults. Similar polygonal networks were identified on modern dry lakes in the western United
States. The kilometre long, metre deep fissures in the Panamint Valley, California, United States
are interpreted to originate from synaeresis and tectonics. Subsequently, the fissures were filled
with aeolian sediment. Vegetation along the lineaments indicates enhanced fluid circulation.
Such fissure systems may serve as fault grain and impact reservoir quality in terms of hydraulic
connectivity of reservoir compartments. For the Rotliegend reservoirs, porosity and permeability
were inverted/decreased by cementation along migration pathways during diagenesis. Permeability
barriers and compartmentalised reservoirs are a potential result of this development.