PGS-RGE Limagnes-Vercors field course

Teachers: E. Deville, C. MagnierVideos: A. Torres

PGS-RGE 2020-21

Limagnes & VercorsField course

Sept. 28 - October 2, 2020

Please, report bugs - if any

Start

Limagnes and Northern Vercors uplandsField course outcrop stops summary

Objectives:This field course is a practical application of the concepts presented in the previous weeks:A focus on the Limagnes extensional features, and a complete section through the western French Alps foreland and thrust belt, with field exposures complemented with seismic and well data.Integration of these data with both geochemical & thermal data via numerical modelling will enable the participants to discuss the basin's potential via the evaluation of the petroleum system's elements.

Wrap up

Introduction

Day #1

Day #2

Day #3

Day #4

Day #5

Introduction to Limagnes & Vercors field course

Google Earth geological map of France

To download the geological map of France: 1. go to Google Earth 2. Download the kml file 3. Upload it into Google Earth "Projects" 4. Tick the file to visualize it as an overlay on the satellite base map

Download "InfoGeol" smartphone app from BRGMInfoTerre

D1

INTRO

D2

D3

D4

D5

WRAPUP

DAY #1 - Outcrop stops 1 & 2

DAY1 - page 1/2

Clermont-Ferrand :Chanteranne

Royat

D1

INTRO

D2

D3

D4

D5

WRAPUP

Day #1 LIMAGNE RIFTStops 1 & 2

Stop#1 - Clermont-Ferrand: Chanteranne

Field course introduction - Landscape viewGeological setting - Seismic section

Limagne border fault - Road cutsFacies analysis

Stop#2 - Royat

DAY1 - page 2/2

D1

INTRO

D2

D3

D4

D5

WRAPUP

DAY #2 - Outcrop stops 3 & 4 - 5 & 6

DAY2 - page 1/3

Grand Gandaillat:quarry

Puy de la poix:oil seeps

Lignat:CO2 seep (geyser)

Puy St André:quarry

D1

INTRO

D2

D3

D4

D5

WRAPUP

Day #2 LIMAGNE RIFTStops 3 & 4

Stop#3 - Puy de la poix: oil seeps

DAY2 - page 2/3

Natural oil and H2S seepageGas analysis

Lacustrine deposits - StromatolitesFacies analysis and fractures measurements

Stop#4 - Grand Gandaillat: carbonate quarry

D1

INTRO

D2

D3

D4

D5

WRAPUP

Day #2 LIMAGNE RIFTStops 5 & 6

Stop#5 - Puy St André: quarry

Stop#6 - Lignat: CO2 spring

DAY2 - page 3/3

Natural CO2 seepage (cold geyser)Gas analysis

Rift-associated volcanics (basalt "organs") Outcrop analysis

D1

INTRO

D2

D3

D4

D5

WRAPUP

DAY #3 - Outcrop stops 1, 2 , 3 & 4

DAY3 - page 1/2

Stop 1

Stop 2

Stop 3

Châteauneuf-sur-Isère

St Nazaire-en-Royans

Crussol

Stop 4

La Sône

______ Black line: seismic profile

D1

INTRO

D2

D3

D4

D5

WRAPUP

day #3 Vercors thrust beltStops 1, 2 , 3 & 4

Stop#1 - Valence: Crussol high

Stop#2 - Châteauneuf-sur-Isère

Stop#3 - Saint-Nazaire-en-Royans

Landscape view and outcropsStratigraphic sequence from tilted block

Anticline (Pliocene) and grabens (Eocene)

DAY3 - page 2/2

DAY #3 program moved to DAY #4due to weather conditions

Stop#4 - La Sône

Carbonate hot spring

D1

INTRO

D2

D3

D4

D5

WRAPUP

*

DAY #4 - Outcrop stops 5, 6 & 7

DAY4 - page 1/2

Pont-en-Royans: river

La Balme de Rencurel+ La Goule Blanche:thrust belt

Stop 8

Stop 9

VERCORS

Pont-en-Royans: belvedere, valley

D1

INTRO

D2

D3

D4

D5

WRAPUP

day #4vercors thrust beltStops 5, 6 & 7

7a: La Balme de RencurelThrust structures in Cretaceous

DAY4 - page 2/2

DAY #3 program moved to DAY #4due to weather conditions

7b: La Goule BlancheThrust structures in Cretaceous

Thrust front (Cretaceous)

Tidal shoreface sandstone

Stops#7 a&b - Thrust belt

Stop#6 - Pont-en-Royan (belvedere)

Stop#5 - Pont-en-Royan (river)

D1

INTRO

Ripples on a megaripple

D2

D3

D4

D5

WRAPUP

DAY #5 - Outcrop stops 8 & 9

DAY5 - page 1/2

Veurey-Voroize:Chartreuse range landscape view

Le Gua: "la fontaine ardente" gas seep

Stop 5

Stop 6

VERCORS

Stop 7

Stop 10

St-Georges-de-Commiers:Landscape viewand wrap up [CANCELLED]

D1

INTRO

D2

D3

D4

D5

WRAPUP

day #5Vercors trust beltStops 8 & 9

Stop#10 - St-Georges-de-Commiers

Stop#9 - Le Gua

DAY5 - page 2/2

"La fontaine ardente" gas seep

Landscape view of the Chartreuse massifStructural analysis and seismic section interpretation

Stop#8 - Veurey-Voroize (Grenoble)

Landscape viewCANCELLED DUE TO BAD WEATHER

D1

INTRO

D2

D3

D4

D5

WRAPUP

Rain...

field course wrap up

No wrap up in the field due to bad weather...Refer to field guide and videos

Report:Discuss tectonic structures potential of both the Limagnes rift system and the compressive Alpine front in the Vercors massif area in terms of:- Residual exploration of HC (oil or gas)- Possible gas storage (HC gas, H2 or CO2) - Medium-to-high temperature geothermal energyDiscussion shall be focused on technical aspects.Limitations related to economics, politics or legal aspects should not be considered.

Structural evolution - Extension / Rift / Inversion

Structural evolution - Compression / Alps

D1

INTRO

D2

D3

D4

D5

WRAPUP