Advances in Earth Science ›› 2007, Vol. 22 ›› Issue (7): 698-707. doi: 10.11867/j.issn.1001-8166.2007.07.0698

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Geological Storage of CO 2 and Commercial Utilization

XU Zhi-gang, CHEN Dai-zhao, ZENG Rong-shu   

  1. Institute of Geology and Geophysics,CAS,Beijing 100029,China

  • Received:2007-03-12 Revised:2007-05-18 Online:2007-07-10 Published:2007-07-10

XU Zhi-gang, CHEN Dai-zhao, ZENG Rong-shu. Geological Storage of CO 2 and Commercial Utilization[J]. Advances in Earth Science, 2007, 22(7): 698-707.

Injecting  CO2 into the subsurface oil and gas reservoirs and coalbeds, at the moment, is the most realistic choice in reducing the  CO2  emission into the atmosphere, which can not only enhance the recoveries of the oil and gas, and coal bed methane, but also can sequestrate partial CO2 within the subsurface reservoirs and coal beds permanently.  CO2  enhanced oil recovery ( CO2 -EOR) is generally performed in the late stage of oil exploration and development, by which  CO2  is injected into the oil reservoirs to enhance the oil recoveries, in general, up to 10-15% by volume. Similarly,  CO2  enhanced gas recovery ( CO2 -EGR) is to inject the  CO2  into the gas reservoirs to enhance the gas recoveries. The extracted gas reservoirs can provide voluminous pore spaces for CO2  storage prior to flooding by formation waters. In this case, Injecting  CO2  into the subsurface gas reservoirs would increase the reservoir pressure and maintain the primary formation pressure, which can keep the integrity and reduce the damage of reservoirs. In the meantime, the traps of oil and gas pools are also good compartments from which leakage of injected  CO2  is prevented, such that the  CO2  is sequestrate in the subsurface permanently. In addition, the  CO2  can also be used to enhance the recovery of coalbed methane by injecting  CO2  into the coalbeds ( CO2 -ECBM), due to the differences in coal adsorption for  CO2  and CH4. Higher absorption of  CO2  related to CH4 by coals would result in the displacement of CH4 by  CO2  in place, thereby enhancing the recovery of coalbed methane when the  CO2  is injected into the CH4-bearing coalbeds.

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