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我国五大莲池、云南腾冲、吉林长白等火山活动区温泉释放的幔源气体CO2/3He 比率受到幔源气体释放机制的控制,在深切岩浆房的断裂活动作用下,以断裂为通道直接自岩浆房中释放的幔源气体,以低于幔源气体脱离岩浆时的CO2/3He 比率为特征,其比率为107 ~109 。同时,我国东部含油气盆地中受活动断裂控制的新生代形成的黄骅、济阳、苏北、三水等地的幔源CO2 气藏,均以107 ~109 的低CO2/3He 比率为特征,与火山区通过断裂通道释放的幔源气体的CO2/3He 特征完全一致。这表明,幔源气体以断裂为通道自岩浆房中直接释放的机制对于含油气盆地中幔源CO2 气藏的形成、气源的补给和气体地球化学特征的塑造起着控制作用,同时也为CO2 气藏的幔源成因提供了进一步的证据。
The CO2 / 3He ratio of mantle source gas released by the hot springs of the five major Lotus Ponds in China, Tengchong, Jilin and Changbai in Jilin Province is controlled by the mechanism of mantle-derived gas release. Under the action of fault activity in the deep magma chamber, The mantle source gases released from the room are characterized by a CO2 / 3He ratio lower than that of the mantle source gases leaving the magma at a rate of 107-109. Meanwhile, the mantle-derived CO2 gas reservoirs of Huanghua, Jiyang, North Jiangsu and Sanshui of the Cenozoic controlled by active faults in the eastern petroliferous basins are characterized by a low CO2 / 3He ratio of 107 to 109, The CO2 / 3He characteristics of the mantle-derived gas released from the volcanic area through the fault channel are exactly the same. This indicates that the mechanism by which the mantle source gas is directly released from the magma chamber by fracture as a channel plays a role in controlling the formation of the mantle-derived CO2 gas reservoir, the gas source recharge, and the gas geochemical characteristics in the petroliferous basins, The mantle origin of the CO2 gas reservoir provides further evidence.