Multimodal geothermal exploration in the Lesser Antilles Arc at the Lamentin lowland (Martinique)

2nd International Geothermal Conference, GEOHEAT2018

Gadalia, A.^1 ; Bouchot, V.^2 ; Calcagno, P.^2 ; Caritg, S.^1 ; Courrioux, G.^2 ; Darnet, M.^2 ; Jacob, T.^2 ; Labeau, Y.^3 ; Taïlamé, A.L.^4 ; Terrier, M.^2 ; Thinon, I.^2 ; Vittecoq, B.^4

77 rue de Bourgogne, Orléans

45000, France^1

BRGM, 3 avenue C. Guillemin, Orléans, Cedex 2

45060, France^2

Université des Antilles Pô le Martinique, EA929 Groupe Biospheres, Campus Universitaire de Schcelcher, BP 7209, Schoelcher-Cedex

97257, Martinique^3

BRGMDirection Régionale de Martinique, Villa Bel Azur 4Lot. Miramar, Route Pointe des Negres, Fort-de-France-Martinique

97200, Martinique^4

关键词: 3-d geological models;    Annual precipitation;    Conceptual model;    Geothermal exploration;    Geothermal fluids;    Geothermal systems;    High temperature;    Hydrothermal deposits;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/249/1/012001/pdf
DOI  :  10.1088/1755-1315/249/1/012001

来源: IOP

【 摘 要 】

The aim of the last geothermal exploration campaign at the Lamentin lowland (Martinique) was to specify the characteristics and the extent of the local geothermal system. In this purpose, previous data were re-processed and new field data were acquired through geological, gravimetric, electromagnetic (CSEM and TEM) and fluids geochemical surveys. All the collected data were gathered in a 3D geological model leading to a new conceptual model. The Lamentin lowland is considered as an active graben controlled by major NW-SE faults and crossed by a NE-SW accommodating fault system. Recent, restricted and monogenic hydro-volcanism was highlighted, associated to large hydrothermal deposits from a first high temperature (HT) geothermal episode. Associated with thermal and soil gas anomalies and CO2-rich springs, they mark out the main faults. A shallow, thin and very conductive layer (