The lava tubes on the Moon, Mars, and other extraterrestrial bodies have the advantages of radiation resistance, meteorite impact resistance, lunar/Martian dust protection, and great thermal insulation. Constructing a habitat base in the lunar or Martian lava tube is one of the feasible options for humans to stay in extraterrestrial bodies for a long time in the future. This paper investigates the feasibility of the lava tube sealing technology, which is one of the most basic technical problems in the construction of lava bases. The space seal structures and the rapid leak detection technique are discussed. Two lava tube sealing schemes are proposed. One is based on the independent and flexible gasbag, and the other is based on the coating treatment for the inner lava tube surface. The key technical problems that need to be solved are described. The development trend of the sealing technology is discussed, and future research in this field is suggested. This study will provide technical support the future deep space exploration and base construction in extraterrestrial objects.’

Oil and gas seepage theory is the basis of oil and gas field development, and development technology is the key to efficient development of oil and gas field. With the continuous discovery of complex oil and gas reservoirs such as unconventional and fracture-vuggy reservoirs, it brings new challenges to the theory and development technology of oil and gas seepage. In this paper, the research status and key theoretical methods of percolation theory of oil and gas reservoirs were summarized. The development directions of extreme and intelligent hydrocarbon percolation mechanics, such as the nonlinear coupling of heat-fluid-solid strength and the change of multi-scale hydrocarbon phase state, were proposed. The present status of hydrocarbon reservoir development technology system and key technologies of hydrocarbon reservoir development in our country were reviewed. The development directions of unconventional oil and gas were put forward, such as the in-situ modification “well factory”, the integration of CO₂ storage, extraction and production, and intelligent development of oil and gas fields.