Injection well
（重定向自Water injection well）
![Deep injection well for disposal of hazardous, industrial and municipal wastewater; a](/Images/godic/202502/20/Deep_injection_well1700.jpg")
![Cumulative number of earthquakes in the central U.S. The red cluster at the center of the map shows an area near Oklahoma which experienced the largest increase in activity since 2009.](/Images/godic/202502/20/Cumulative_induced_seismicity1700.png")
An injection well is a device that places fluid deep underground into porous rock formations, such as sandstone or limestone, or into or below the shallow soil layer. The fluid may be water, wastewater, brine (salt water), or water mixed with chemicals.