松辽盆地富氢天然气地质调查与研究OA北大核心CSTPCD

Hydrogen energy is an important carrier for global energy transition and development.Compared to artifi-cially producing hydrogen,the exploitation of natural hydrogen not only has advantage of low cost,but also is the key in realizing complete decarbonization of energy.As a large intracontinental rift basin,Songliao Basin has poten-tial for exploring natural hydrogen.Natural hydrogen content of middle and lower oil-and gas-bearing assemblages and deep gas-bearing assemblages in northern Songliao Basin is systematically summarized for the first time to pre-liminarily analyze spatial distribution characteristics,source,genesis mechanism and controlling factors of natural hydrogen.The results show that hydrogen-bearing natural gas(φ(H2)>1.0%)widely develops in Central Depression of Songliao Basin,with hydrogen content of 1.00%～85.54%,of which hydrogen-rich gas(φ(H2)>10.0%)are main-ly in deep gas-bearing assemblages,with gas production ranging from trace to 1 444 m3/d and distribution near rift-controlling faults.Natural hydrogen in Songliao Basin is mainly generated by water-rock reaction in deep iron-rich rocks,with sustainable hydrogen generation and supply,providing material basis for natural hydrogen accumula-tion.The formation of hydrogen-rich gas reservoirs above basement is controlled by rift-controlling faults and deep large faults connecting to the mantle.Oil and natural gas reservoirs have dilution and destructive impact on hydro-gen-rich gas.Future exploration of natural hydrogen gas reservoirs should avoid favorable areas with oil and gas charge.Deepening the understanding of deep crust-mantle structure and inorganic geochemical processes in the ba-sin is an important scientific subject for future natural hydrogen exploration in Songliao Basin.The research pro-vides theoretical guidance for exploration of natural hydrogen in Songliao Basin.