The Chevry area was drilled several times with main objective the “Grès de Chaunoy”. In “Trois Fontaines” and “Forcelles” fields (East Paris Basin), minor gas reserves were discovered that derived from Late Carboniferous coal layers. Southeast from the study area, additional oil discoveries are tracing the same reservoir pattern (Chamottes, Saint-Germain and Chaunoy, Coulommes - Vaucourtois, Chailly en Brie and Chartrettes fields). Both N-S and E-W direction affect the sedimentary pile. Among 8 drilled wells (1700-2900 m TD), 1 had oil shows. Several 2D seismic crews were shot between 1962 and 1998 totalizing more than 500 km. Fourteen prospects and leads have been identified with potential OIP between 15 and 21 MMBO.

Reservoirs : Upper Dogger oolithic limestones are good reservoir rocks in the Villevaude area with portosities up to 11%. Both the Grès de Chaunoy and the Grès de Donnemarie (Upper Trias) are well represented, however with low porosities of around 6%.
Source-rocks : The main source rock is the Liassic shales. Migration begins in Late Cretaceous with hydrocarbons moving upward in the oolitic limestones of Upper Dogger (Callovian - Bathonian). Minor source rock is considered to be Pre-Triasic shales providing oil that migrated at a later time in the Chaunoy and Donnemarie sandstones.
Seals : Callovian and Keuper shales.
Traps : They are structural, developing mostly in grabens. Some stratigraphic traps appear to be Pre-Triasic channel infills.