Abstract: The invention is a method for the exploitation and/or monitoring of an underground formation having at least one reservoir comprising water, at least one gas species of interest and at least one atmospheric isotope of at least one rare gas present in dissolved form in the water of the reservoir. The method includes at least (1) taking at least one gas sample at the level of at least one collection of water from the reservoir, the collection being at the surface and the sampling being carried out to avoid any contamination with the air; (2) measuring at least the concentration of at least the gas species and the concentration of at least an atmospheric isotope of the rare gas in the gas sample; (3) determining the concentration of the gas species of interest dissolved in the water of the reservoir by a model.

Abstract: The invention is a method for the exploitation and/or monitoring of an underground formation having at least one reservoir comprising water, at least one gas species of interest and at least one atmospheric isotope of at least one rare gas present in dissolved form in the water of the reservoir. The method includes at least (1) taking at least one gas sample at the level of at least one collection of water from the reservoir, the collection being at the surface and the sampling being carried out to avoid any contamination with the air; (2) measuring at least the concentration of at least the gas species and the concentration of at least an atmospheric isotope of the rare gas in the gas sample; (3) determining the concentration of the gas species of interest dissolved in the water of the reservoir by a model which is a function at least of the concentrations of the gas species of interest and of the atmospheric isotope measured in the gas sample.

Abstract: This invention is a method of developing a sedimentary basin containing hydrocarbons, by using basin simulation. Starting with gridded representations representative of a basin for each time step of a simulation, for each time step and in each cell of the gridded representation the following steps are performed. First a determination of at least one amount of biogenic gas produced in the cell for the time step is preformed followed by determining at least one amount of biogenic gas dissolved in water present in the cell at the time step, and determining therefrom an amount of free biogenic gas in the cell at the time step; then, accounting for advective transport of the quantity of biogenic gas dissolved in the water of the cell at the time step.

Abstract: A facility for monitoring a geological storage site for storing a gas, such as CO2 or methane, comprises, in combination, at least one geochemical measurement device (DMG), comprising a plurality of gas sampling probes (SPG) connected to a gas analyzer (AG), an electrical measurement device (DME) comprising a plurality of electrodes (ELEC) and a resistivity meter (RES), and a meteorological station (SM). The geochemical and electrical measurement devices are controlled by a logic controller (AUT). The geochemical and electrical measurement devices and the meteorological station are connected to a data collector (COLL) that is itself connected to means for transmitting said data (MTD).

Abstract: A device for monitoring an formation below the ground G containing a fluid such as CO2 or methane comprising a measuring cell arranged in a cavity, can an F analyzer disposed on the surface and a sealed connection connecting measuring cell to the analyzer. The measuring cell comprises two chambers that can sealingly communicate with one another. The first chamber comprises a plurality of orifices allowing passage of the fluid into first chamber, at least two inner electrodes and fluid circulator. The second chamber is impervious to the fluid. Applications include monitoring of geological storages sites for gas such as CO2.

Abstract: A facility for monitoring a geological storage site for storing a gas, such as CO2 or methane, comprises, in combination, at least one geochemical measurement device (DMG), comprising a plurality of gas sampling probes (SPG) connected to a gas analyser (AG), an electrical measurement device (DME) comprising a plurality of electrodes (ELEC) and a resistivity metre (RES), and a meteorological station (SM). The geochemical and electrical measurement devices are controlled by a logic controller (AUT). The geochemical and electrical measurement devices and the meteorological station are connected to a data collector (COLL) that is itself connected to means for transmitting said data (MTD).

Abstract: The invention is a method for the exploitation and/or monitoring of an underground formation having at least one reservoir comprising water, at least one gas species of interest and at least one atmospheric isotope of at least one rare gas present in dissolved form in the water of the reservoir. The method includes at least (1) taking at least one gas sample at the level of at least one collection of water from the reservoir, the collection being at the surface and the sampling being carried out to avoid any contamination with the air; (2) measuring at least the concentration of at least the gas species and the concentration of at least an atmospheric isotope of the rare gas in the gas sample; (3) determining the concentration of the gas species of interest dissolved in the water of the reservoir by a model which is a function at least of the concentrations of the gas species of interest and of the atmospheric isotope measured in the gas sample.

Abstract: The invention relates to a method and a system for analyzing rare gases present in a gaseous fluid (1). According to the invention, initially, the rare gases are extracted from the gaseous fluid by trapping by means of a getterizing substrate (5), then superconcentration of the rare gases is produced before injection (8) into the measuring instruments (9). By virtue of the invention, it is possible to increase the partial pressure of the rare gases in the gases to be analyzed before their injection into the analysis instruments.

Abstract: The invention relates to a fluid sampling device comprising a sample chamber (01) including a lower piston (05), an upper piston (02) and an intermediate piston (28). Intermediate piston (28) is moved so as to guarantee a substantially constant volume for chamber (01) when closing the chamber.

Abstract: The invention is a device for sampling fluids under pressure from a well which comprises a chamber for retaining the fluid within a sample chamber (01). The chambers includes a first piston which allows or prevents fluid inflow into the lower part of the chamber. The first piston is displaced by means comprising an elastic element (20) disposed in a chamber filled with oil and connected to the piston by a rod (04). Sampled fluid transfer means allows control of the descent of a second piston (02) from the upper part to the lower part of the chamber so that the fluid remains at constant pressure in chamber during the transfer.

Abstract: A device for monitoring an underground formation containing a fluid such as CO2 or methane comprising a measuring cell (CM) arranged in a cavity, analysis means (MA) arranged on the surface and sealed connection means (ML) connecting measuring cell (CM) to analysis means (MA). The measuring cell comprises two chambers (CH1, CH2) that can sealingly communicate with one another. The First chamber (CH1) comprises a plurality of orifices (OR) allowing passage of the fluid into first chamber (CH1), at least two inner electrodes (EI) and fluid circulation means (MC). Second chamber (CH2) is impervious to the fluid.

Abstract: This invention is a method of developing a sedimentary basin containing hydrocarbons, by using basin simulation. Starting with gridded representations representative of a basin for each time step of a simulation, for each time step and in each cell of the gridded representation the following steps are performed. First a determination of at least one amount of biogenic gas produced in the cell for the time step is preformed followed by determining at least one amount of biogenic gas dissolved in water present in the cell at the time step, and determining therefrom an amount of free biogenic gas in the cell at the time step; then, accounting for advective transport of the quantity of biogenic gas dissolved in the water of the cell at the time step. Application: petroleum reservoir exploration and development for example.

Abstract: The invention is a device for sampling fluids under pressure from a well which comprises a chamber for retaining the fluid within a sample chamber (01). The chambers includes a first piston which allows or prevents fluid inflow into the lower part of the chamber. The first piston is displaced by means comprising an elastic element (20) disposed in a chamber filled with oil and connected to the piston by a rod (04). Sampled fluid transfer means allows control of the descent of a second piston (02) from the upper part to the lower part of the chamber so that the fluid remains at constant pressure in chamber during the transfer.

Abstract: The invention relates to a fluid sampling device comprising a sample chamber (01) including a lower piston (05), an upper piston (02) and an intermediate piston (28). Intermediate piston (28) is moved so as to guarantee a substantially constant volume for chamber (01) when closing the chamber.

Abstract: The invention relates to a method and a system for analyzing rare gases present in a gaseous fluid (1). According to the invention, initially, the rare gases are extracted from the gaseous fluid by trapping by means of a getterizing substrate (5), then superconcentration of the rare gases is produced before injection (8) into the measuring instruments (9). By virtue of the invention, it is possible to increase the partial pressure of the rare gases in the gases to be analyzed before their injection into the analysis instruments.