Mobilisation of organic compounds from reservoir rocks through the injection of CO2 —Comparison of baseline characterization and laboratory experiments

Comparison of the microbial community composition of pristine rock cores and technical influenced well fluids from the Ketzin pilot site for CO2 storage

“…The microbial community predominantly comprised fermentative halophilic anaerobic bacteria and especially SRB. The interaction between SRB, reservoir rock-fluid system and injected CO2 might induce changes in structure and chemical composition of the formations, provoking corrosion at the well casing, favored by organic carbon, which is mobilized through supercritical CO2 (Scherf et al 2011), affecting the well integrity on a longterm basis.…”

“…In the Stuttgart Formation rock samples, the TOC was between 74 and 3316 mg/kg Scherf et al 2011). The TOC in the well fluid of the SOW samples obtained during the pump test showed an average of 7 mg L -1 , whereas after the N2 lift, in the DOW fluids, the TOC was 18 mg L -1 .…”

“…Because it is the target reservoir for CO2 storage, the Stuttgart Formation was largely investigated in recent years Fischer et al 2010;Scherf et al 2011). The drilling of deep well in the Ketzin area offered numerous opportunities to obtain Stuttgart Formation samples, which together with the lower part of the caprock, were the only formations consistently cored (Prevedel et al 2009).…”

Mineralogical and geochemical analysis of Fe-phases in drill-cores from the Triassic Stuttgart Formation at Ketzin CO2 storage site before CO2 arrival

“…Also, bio-available organic compounds could be leached from unreactive solid-phase organic matter by supercritical CO 2 . For example, Scherf et al (2011) showed a mobilization of up to 39% of sedimentary organic matter by the flow of supercritical CO 2 in laboratory flow-through experiments with undisturbed inner cores of Ketzin sandstone samples, obtained after the removal of drill mud contaminations. In addition, low molecular weight organic acids such as formate, acetate and propionate as well as butanoic, pentanoic, lactic, pyruvic, glycolic and gluconic acid were extracted to a sum of up to 538 lg/kg reservoir rock due to exposure to supercritical CO 2 .…”

Borehole seismic monitoring of CO2 storage within a saline aquifer at Ketzin, Germany

“…• Analyses of rock samples, gases and fluids from the subsurface (Muller et al (2009);Fischer et al (2010Fischer et al ( , 2011; Myrttinen et al (2010); Zemke et al (2010); Kummerow and Spangenberg (2011);Rempel et al (2011);Scherf et al (2011);Zimmer et al (2009Zimmer et al ( , 2011a). …”