China has very large amount of shale gas resources,the development of shale gas has become a hot spot and focus on the field of unconventional oil and gas resources in our country,although the hydraulic fracturing can achieve large-scale commercial exploitation of shale gas,but the clay swelling,water resource waste and environmental pollution can not be underestimated,and using supercritical CO_2 fracturing shale and flooding shale gas which can improve the shale gas production,but also can realize the geo...