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Reservoir Stress Path for Underground Gas Storage

Niederhuber, Thomas; Müller, Birgit; Rudolph, Tobias; Schilling, Frank; Schmitt, Douglas R.

Abstract:
Injection or production from porous reservoirs respectively increases or decreases reservoir pore pressure that correspondingly lower or raise the effective stresses. The pore pressures vary with fluid volumes displaced depending on permeability, flow rates, and time. During fluid injection or retrieval, the magnitude and spatial distribution of pore pressures will depend critically on the formation permeability. This consequent changing of effective stresses is of particular concern to underground gas storage (UGS) projects subject to seasonal variations of fluid pressures with the modern demands may result in higher frequencies of filling and discharge. Already, a number of publications have attempted to predict the reservoir’s stress path which is normally presented as changes to the horizontal stresses. In general, for the stress path the total stresses (not the effective stresses) are considered. Here, using a generic numerical model we first investigate the influence of well locations on the reversibility of storage pressures and stresses within the reservoir. The generic model was then adapted to study more specifically using the actual depth, reservoir thickness, and material properties of an existing UGS site in the Bavarian Molasse Basin, Germany. ... mehr



Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Poster
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator KITopen-ID: 1000105228
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung Fall Meeting (AGU 100 2019), San Francisco, CA, USA, 09.12.2019 – 13.12.2019
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