Structural and Parametric Models of the Załezcze and Zuchlów Gas Field Region, Fore-Sudetic Monocline, Poland – An Example of a General Static Modeling Workflow in Mature Petroleum Areas for CCS, EGR or EOR Purposes
Résumé
Załęcze and Żuchlów are strongly depleted natural gas fields in aeolian sandstones of the
Rotliegend, located in the central part of the Fore-Sudetic Monocline. A set of three static 3D models
was generated to check the possibility of CO2 injection for Enhanced Gas Recovery (EGR) and to check
the safety of storage by means of geomechanical modeling: one regional model (ZZA) and two local
models – the first for Załęcze (ZA) gas field and the second for Żuchlów (ZU) gas field. The regional
model is composed of 12 stratigraphic complexes (zones) from the base of the Rotliegend to the
ground surface. The local models comprise only the three lowermost complexes: fluvial deposits of
the Rotliegend, aeolian sandstones of the Rotliegend (Reservoir I) and basal Zechstein limestone,
Ca1. The key elements of the modeling procedure include: Quality Control (QC) of the data,
interpretation of missing parameters necessary for static modeling and their integration within a
geomodel. The processing workflow was elaborated to produce convergent regional and local
models. The regional static model is a framework for a regional geomechanical model. The local
models are the basis for dynamic simulations and local geomechanical modeling. The presented
workflow could be used with some changes for geomodeling of many mature gas and oil fields.
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