| 摘要 |
Provided is a method of recovering gaseous hydrocarbons and/or liquid hydrocarbons from underground, characterized by using a poly(lactic acid) resin comprising an a poly-L-lactic acid component and a poly-D-lactic acid component and having a heat of fusion at 190°C or higher, as measured by differential scanning calorimetry, of 20 J/g or more, wherein the underground is at a depth of 3,000 m or deeper. According to the recovery method of the present invention, shale gas, shale oil, and the like can be recovered efficiently. |
