The Anisian Carbonates of the Peri-Tethys Basin: From Reservoir Characterization to Subsurface Utilization
Gast, Sascha 1; Wirth, Holger 1; Götz,
(1)Federal Institute for Geosciences and Natural Resources, Berlin, Germany. (2) Applied Geosciences, TU Darmstadt, Darmstadt, Germany.
The sustainable subsurface utilization is focus of recent studies on Triassic sedimentary series in northeast Germany, aiming at geothermal energy and gas storage. Based on outcrop analogue studies on Anisian Peri-Tethys carbonate ramp deposits along a palaeogeographic transect from northwest Germany to south Poland (Götz and Lenhardt, 2011), well logs are analyzed with respect to the petrophysical rock properties and sequence interpretation. From outcrops, stratigraphic intervals of low, medium and high permeabilities are recognized, corresponding to transgressive, maximum flooding and highstand deposits in terms of sequence stratigraphy. Within large-scale, third-order depositional sequences, late highstand deposits represent the most permeable sediments.
In northeast Germany, the top of the up to 150 m thick Anisian carbonates is known to be at depths of 100 to 3300 m (Hoth et al., 1993). This wide range of the tops is due to regional salt tectonics characteristic of the Southern Permian Basin Area, documented in the Petroleum Geological Atlas (Doornenbal and Stevenson, 2010). Here, a research well (Luckenwalde E Lw 1/1980) southwest of Berlin was investigated to demonstrate the high degree of lateral facies and poroperm continuity, contributing to subsurface reservoir characterization. Once the lateral and stratal facies successions and sequence architecture of the sedimentary basin and its distinct ramp system is known, a reliable reservoir prognosis becomes feasible from well logs.
AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.