Geochemical Assessment of the Injection of CO2 into Rousse Depleted Gas Reservoir. Part I: Initial Mineralogical and Geochemical Conditions in the Mano Reservoir

AbstractGeochemical modeling of the CO2 injection into the Rousse depleted gas reservoir (Lacq CO2 injection pilot, France) requires an accurate knowledge of initial mineralogical and geochemical conditions in the formation.Therefore, the primary objective of this work was to provide a detailed mineralogical and chemical composition of the Rousse reservoir (Mano dolomite), and accurate relative mineral proportions. This was achieved by use of a combination of techniques including in-house developed methodology for bulk rock quantitative mineralogy and complementary approaches such as optical microscopy, SEM-Quantax (chemical mapping) and Electron Miroprobe Analysis (mineral chemical composition).Particular attention was paid the minute amounts of chlorite occurring in the reservoir, in order to obtain its exact chemical composition and textural habitus. The chlorite revealed to be Mg-rich and of a sudoite-like nature. As a consequence the initial geochemical model, which assumed the chlorite to be Fe-rich was corrected, so as to ensure more accurate reactive geochemical modeling.A refined quantitative mineralogy and chemical composition of the Rousse reservoir (Mano dolomite), fulfilling thermodynamic equilibrium at initial conditions (150°C, 480bar), is provided

The Géocarbone-Monitoring Project: Main results and recommendations for monitoring deep geological CO2 storage in the Paris Basin

International audienceThe aim of the Géocarbone-Monitoring research project was the evaluation and testing, as far as possible, of the different monitoring methods that might be applied in the specific context of the Paris Basin. Their main objectives are to: detect and map CO2 in the reservoir rocks;detect and quantify possible leaks between the reservoir and the surface. The partners developed several thoughts and research concerning the various monitoring methods. This enabled drawing up a critical overview of existing methods and proposing leads for further work. At the end of the project, recommendations were made for the stakeholders of CO2 storage, i.e. the government departments regulating storage, decision-makers, and future site operators. In addition, a proposal was made for the general design and implementation of a monitoring programme of an injection test in the Paris Basin, within a depleted reservoir or a deep aquifer

A site selection methodology for CO2 underground storage in deep saline aquifers: case of the Paris Basin

International audienceSite selection is a fundamental step, which can condition the success of a CO2 geological storage. A CO2 storage has to gather several targets, which can be expressed through a list of criteria. In the proposed site selection methodology, these criteria can be classified into “killer criteria” and “site-qualification criteria”, whose combinations allow identifying potential sites and the most appropriate one(s). This multicriteria methodology is applied on the PICOREF study area, located in the Paris Basin, on which potential site(s) in deep saline aquifers are investigated

Evaluating sealing efficiency of caprocks for CO2 storage: an overview of the Geocarbone Integrity program and results

8 pagesInternational audienceThe objectives of the Geocarbone-Integrity program are to develop techniques, methodologies and knowledge concerning the long term confinement of CO2 in geological storage. Linked to other French programs such as Geocarbone Injectivity or Picoref, it is an integrated approach involving geochemistry, petrophysics, geology and geomechanics. Different scales must be considered in order to describe caprocks: from the pore or grain scale in petrophysics and geochemistry, to regional scale in geology and geomechanics. The program focused on a specific site of the Paris basin but the methodologies developed are general and can be applied elsewhere

Central Gulf of Aden conjugate margins (Yemen-Somalia): Tectono-sedimentary and magmatism evolution in hybrid-type margins

International audience6 7 Magma-rich and magma-poor passive margins are generally studied separately. Yet, the spatial evolution from 8 one type to another is not well understood. Central Gulf of Aden margins are at the transition between these 9 two types of margins. Based on new seismic data, published wells and gravity data, we determine seismic 10 stratigraphy and structural patterns. We map the distinct crustal domains (continental, Ocean-Continent 11 Transition (OCT), oceanic domains) and propose a tectonic evolution of the Yemeni and Somalian conjugate 12 margins in an oblique rifting context. The most striking results are the significant segmentation, narrowness 13 and asymmetry of conjugate margins, as well as the gradual eastward decrease in the intensity of magmatic 14 activity of these hybrid-type margins. West of Bosaso-Hami Fracture Zone (BHFZ), the Hami-Ahl Medo segment 15 presents magmatic-type margin features in the distal Yemeni margin related to the strong influence from the 16 Afar plume: Seaward dipping reflectors develop since the late syn-rift stage (~21-18 Ma) near the Xiis-Al 17 Mukalla Fracture Zone. Conversely, east of BHFZ, the Bosaso-Sayhut margins segment is characterized by 18 magma-poor margins for which the exhumation stage is characterized by the unroofing of mantle along 19 multiple detachment faults in the OCT and shortly followed by diachronous volcanism (~18 Ma). The central 20 Gulf of Aden is affected by a major uplift during the final syn-rift stage and up to OCT formation. This event is 21 associated with the formation of erosional surfaces in the east and with gravitational deformation taking place 22 on decoupling surfaces at the base of the syn-rift sequence (lower Ghaydah Fm) that lead to the sliding of syn-23 rift units on top of the exhumed mantle rocks in the OCT. 24 2

The site monitoring of the Lacq industrial CCS reference project

AbstractTOTAL conducts the first French pilot to demonstrate the technical feasibility and reliability of an integrated CO2 capture, transportation, injection and storage scheme from a boiler at a 1/10th reduced scale of an industrial project.This pilot entails the conversion of an existing steam boiler into an oxy-fuel combustion unit, oxygen being used for combustion rather than air to obtain a more concentrated CO2 stream easier to capture. Then, CO2 stream is compressed and conveyed via pipeline to the Rousse depleted gas field, 30 kilometers away, where it is injected into a deep carbonate reservoir. CO2 injection has started early 2010 as all the proper official authorizations have been given. Those authorizations concern two years of injection and three years of post injection observation.An appropriate monitoring plan was designed to check the integrity of the site, to compare the CO2 behavior as it is planned and to get information to calibrate tools and models.This paper details the monitoring program: continuous measurements through permanent sensors, such as microseismicity or reservoir behavior with pressure and temperature data, and periodic surveys mainly for environmental purposes such as the groundwater quality and the surface water quality within the injection site catchment area and the fauna and the flora biodiversity