Norway Grants J. Francu1, V. Hladik1, F. Buzek1, O. Prokop1, L. Jurenka1, V. Kolejka1, M. Pereszlenyi 1, and E. Ford2 1 Czech Geological Survey (CGS), 2 International Research Institute of Stavanger (IRIS) Preparation for a pilot project of CO2 geological storage in the Czech Republic Baseline monitoring of CO2 and methane for risk assessment of a future pilot CCS site LBr-1: relationship to the residual oil and gas field saturation Trondheim CCS, 13 June, 2017 Principle steps in Soil Gas Baseline Monitoring 1.Screening soil gas measurements 2.Finding elevated CO2 and CH4 3.Instalation of automatic stations 4. Meteo data 5. Soil and subsoil clay/sand content 6. Old wells and abandoned oil/gas field 7. Ground water level 8. Isotopes 9. Background values and Anomalies LBr-1 CO2-Storage Complex Well locations and 3D seismics D:\A BRODSKE\Brodske vstupne udaje\1 Data\02 Mapy obrazky\Topo Brodske.jpg Three state borderlines Czech R. – Slovakia - Austria Field screening measurements Sniffing Portable Instrument Early Spring flooding Soil probe makes a hole Soil profile description Gas sampling & measurements Soil profiles & Gs sampling Automatic stations CO2 & Methane monitoring Automatic CO2 / methane IGS station Instalation of the IGS station Continuous CO2 measurements Clay dominated soil profile Less permeable clay-rich soil and subsoil Gas inflow limited - Shalow measurements air contaminated Deeper measurements – higher CO2 , further pumping brings air contamination Sandy-silty soil profile Permeable sandy soil and subsoil Gas inflow sufficient - the steeper incipient part of the curve indicates the gas flux 4 Vrtane sondy VRA Lithology Lithological profiles Of the Soil / Subsoil Drilled 2 – 3 m holes Ground Water Level measurements Effect of ground water level fluctuation Winter Winter Summer Summer Winter Effect of soil type At least once a year Controled flooding Gley rich soils form Quaternary sedim. are poor in CaCO3 Oxbows meanders - Sandy channels - Overbank sed. enriched in clay Br profile Effect of clay/ sand content 2D Soil Profiles help to understand the regional trends Profil%20AA Profil%20BB%20+%20co2 Effect of Oil and Gas accumulation and wells 55 Deep exploration wells, oil and gas field at depth of 1080-1110 m Mid. Badenian reservoir 3D Model in Petrel of the CO2 Storage Complex Base of the Lab reservoir L1 L2 L3 L4 Fault 1 4 tops of the partial layers of the Lab reservoir 3D view of the Lab reservoir Attribute: Average Absolute Amplitude Seismic Attributes Analysis C:\Users\user\Desktop\LAUSANE\att.jpg Reveals residual Oil & Gas saturation Risk of Methane/ CO2 Leakage Abandoned BR Wells Well design Mud and Cement Plugs In spite of plugging The old wells Make potential conduits for minor gas migration and often show increased values of methane and CO2 Maps of CO2 in Soil Gas Oil and Gas zones Warm Season Cold Season CO2 in Soil Gas – 2D Profiles SW Warm Season NE Cold Season SW NE Relative Distance (m) Relative Distance (m) Relative Distance (m) SSE NNW Cold Season Gas zone Oil zone Isotopes – Evidence of Methane – to – CO2 oxidation Soil gas has a surprisingly elevated amount of CO2 when compared to normal forest soil CO2 is isotopically very light Isotopes delta13C CO2 We can distinguish three types of CO2 : 1.Normal 2.Mixed 3. CO2 from microbial oxidation of methane Principle steps in Soil Gas Baseline Monitoring 1.Screening data - > very dependent on p,T, time, daily/ seasonal variations 2.Maps of CO2 and CH4 3.Every hour sampling - > details 4. Drop in Atm. Pressure - > more gas 5. Soil clay = seal / sand permeable zone 6. Old wells – migration avenues 7. Ground water level rise - > more CO2 met 8. Isotopes - > Microbial methane oxidation 9. Background 0.5-1% Anomalies 1-8% CO2 F:\Foto\15\150705 Soutok na kole\IMG_8799.JPG Thank you for your attention REPP-CO2 team Acknowledgements: The REPP-CO2 project benefited from the Norway Grants, Proj. No. NF-CZ08-OV-1-006-2015