Experimental Study on Microbial-Induced Calcium Carbonate Precipitation Repairing Fractured Rock under Different Temperatures

Microbial-induced calcium carbonate precipitation (MICP) technology mainly uses carbonates produced by the reaction of microbial activities to repair rocks and soils. Temperature influences metabolism kinetics chemical reactions. In this study, experiments on fractured sandstone under different temperatures are carried out. The effects tested with nuclear magnetic resonance (NMR), an X-ray automatic diffractometer (XRD), uniaxial compressive strength (UCS), a scanning electron microscope (SEM) test. influence temperature restorative MICP was discussed. results show that effect Sporosarcina pasteurii is significantly better as increases. When reaches 33 °C, porosity permeability can be reduced 55.174% 98.761%, respectively. average restored 6.24 MPa. gradually weakens increase in temperature. However, still maintain relatively good biological activity at from °C 39 °C. main form CaCO3 process calcite. It fill rock pores, result reducing size number large pores improving impermeability yellow sandstone.