The invention discloses a method for sealing and storing
carbon dioxide in
basalt by adopting a
butt joint well, and belongs to the technical field of carbon emission reduction. The method comprises the steps that firstly, a horizontal well is constructed, a horizontal well section is drilled by 1000-1500 m in the upper portion of
basalt, and a screen
pipe is put down for well completion; secondly, 3-5 vertical wells are constructed along the drilling track of the horizontal well section, and segmented perforation and fracturing construction are sequentially carried out in the middle of
basalt, so that an artificial crack formed by fracturing is communicated with the horizontal well section; then, mine water generated by a
coal mine is continuously injected into basalt from the
wellhead of the horizontal well; and finally, CO2 is captured from a
coal-fired power
plant and the like and is conveyed to a vertical well site through a
pipe, then the CO2 is cooled and pressurized into liquid CO2, the liquid CO2 is continuously injected from a vertical well mouth, and mineralization and storage of CO2 in the basalt layer are achieved. According to the method, efficient and
safe storage of CO2 in basalt is achieved on the premise of low
water consumption, comprehensive utilization of
coal mine water is achieved, and remarkable economic, environmental and
social benefits can be generated.