In the Southern Kanto Gas Field, formation water is pumped from a reservoir in order to produce the natural gas. The production of formation water is considered to be one of the causes of land subsidence. We plan the test injecting into shallow formations that are expected to be effective in mitigating land subsidence. If the land subsidence mitigation effect is confermed in this test, reservoir management and increase in production may be possible while considering land subsidence mitigation.

In Chiba prefecture in Japan, it has been reported land subsidence for many decades. One of the causes of land subsidence is considered gas production. To reduce and control land subsidence, we applied PDCA method in a certain new development area. As a result, we could maintain successfully the land subsidence less than the target value, 20 mm/year at the present moment.