Abstract
Zalecze and Żuchlow 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 Zalecze (ZA) gas field and the second for Żuchlow (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.
Highlights
Kalaydjian531 > SiteChar – Methodology for a Fit-for-Purpose Assessment of CO2 Storage Sites in Europe
This paper presents an outline of the methodology and workflow applied for the creation of three complementary 3D static geomodels, for testing the possibility of CO2 injection for underground storage (Carbon Capture and Storage, CCS) and Enhanced Gas Recovery (EGR), as well as for the security assessment of these processes by means of geomechanical modeling
Regarding the specific results for the ZZA, the following aspects of the work can be highlighted: – the models presented in this paper are based on a very extensive input database covering: very rich stratigraphic identification in wells; seismic identification based on low-quality 2D seismic data, and covering only part of the project area
Summary
531 > SiteChar – Methodology for a Fit-for-Purpose Assessment of CO2 Storage Sites in Europe. 635 > Structural and Parametric Models of the Załęcze and Żuchlów Gas Field Region, Fore-sSudetic Monocline, Poland – An Example of a General Static Modeling. Résumé — Modèles structurels et paramétriques de la région des gisements de gaz de Załęcze et Żuchlów, Région monoclinale des Sudètes, Pologne – un exemple du déroulement d’une modélisation statique générale dans des zones de pétrole matures dans un but de CCS, EGR ou d’EOR — Załęcze et Żuchlów sont des gisements de gaz naturel largement épuisés dans les sables éoliens du Rotliegend, situés au centre de la structure monoclinale des Sudètes. Oil & Gas Science and Technology – Rev. IFP Energies nouvelles, Vol 70 (2015), No 4 composé de 12 complexes stratigraphiques (zones) depuis la base du Rotliegend jusqu’à la surface du sol. La méthodologie présentée pourrait être utilisée moyennant quelques adaptations à la géomodélisation de nombreux gisements de gaz et de pétrole matures
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