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Contenu archivé le 2022-12-27

GEOPHYSICS INTERPRETATION OF SUBSIDENCE MEASUREMENTS [PHASE 2]

Objectif

This project consists in measuring subsidence movements induced by pressure changes associated to reservoir depletion in view of evaluating that depletion. These subsurface movements are then converted into reservoir pressure changes versus space and time using a F. E. model of all relevant layers i.e. overburden, reservoir and underburden. Finally this pore pressure map is converted into a permeability map in both reservoir and aquifer.
Severe discrepancies are observed between subsidence measurements and simulations. In fact the subsidence remains very small and it is not so easy to extract the influence of the depletion from the raw data. Because of this statement the project was not completely achieved : new levelling methods were not developped and the inverse methods to obtain pore pressure variations and permeability were not completed. However, the levelling survey seems to indicate a fault in the North of the Villeperdue field.
The general purpose of this study consists in detecting the closure type (fault, water drive, etc...) of the Villeperdue geological structure (Parisian Basin, France) on the east and north sides.
An other connected target is to monitor the injected water front.
Phase 1 : Technological studies
1. 1 Optical fiber tiltmeter development
1. 2 Feasibility study of a horizontal tilt log
1. 3 Development of a levelling method using laser interferometry
1. 4 Development of numerical inverse methods in order to derive :
- pore pressure variations from subsidence measurements
- permeability map pore pressure variation map
Phase 2 : Subsidence measurement survey around Villeperdue area
2. 1 Positioning of level beacons for IGN (Institut Geographique
National) levelling along a 60 km profile - IGN surveys
2. 2 Pilot subsidence measurements using new developments described
in Phase I
Phase 3 : Measurement interpretation
3. 1 Selection of geometricalparameters and mechanical properties
3. 2 3D numerical simulation of subsidence process
3. 3 Physical output interpretation.

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

GERTH
Contribution de l’UE
Aucune donnée
Adresse
232 AV. NAPOLEON BONAPARTE
92500 Rueil Malmaison
France

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Coût total
Aucune donnée