CAJ | 학술논문

济阳坳陷高青-平南发育多个CO_2气藏,对气藏组分、同位素以及组分同位索相关组合进行分析,认为气藏中CO_2主要是幔源-岩浆成因.气藏同时具有高~(40)Ar/~(36)Ar和高~3He/~4He值表明:气藏中稀有气体主要来自幔源,同时有部分壳源混入;气藏中~4He/~(40)Ar~*平均值为2.15,说明该地区气藏形成主要以岩浆缓慢脱气为主,大规模CO_2及稀有气体是岩浆冷却结晶阶段所释放.其形成机理为:在随岩浆上升的过程中,随着压力和温度不断下降以及岩浆成分的变化,岩浆中CO_2及稀有气体溶解度也随之降低并析出,产生的大量CO_2及稀有气体沿着深大断裂及一些二、三级断裂交汇处输送至地层的各类圈闭中,并在适当的位置聚集成藏.
제양요함고청-평남발육다개CO_2기장,대기장조분、동위소이급조분동위색상관조합진행분석,인위기장중CO_2주요시만원-암장성인.기장동시구유고~(40)Ar/~(36)Ar화고~3He/~4He치표명:기장중희유기체주요래자만원,동시유부분각원혼입;기장중~4He/~(40)Ar~*평균치위2.15,설명해지구기장형성주요이암장완만탈기위주,대규모CO_2급희유기체시암장냉각결정계단소석방.기형성궤리위:재수암장상승적과정중,수착압력화온도불단하강이급암장성분적변화,암장중CO_2급희유기체용해도야수지강저병석출,산생적대량CO_2급희유기체연착심대단렬급일사이、삼급단렬교회처수송지지층적각류권폐중,병재괄당적위치취집성장.
In the surroundings of the Gaoqing-Pingnan fault zone five CO_2 gas reservoirs are developed.Based on the data on compositions,isotope geochemistry and CO_2/~3He of the reservoirs,it is shown that CO_2 distributed in the Caoqing area was mostly originated from the mantle-sourced inorganic material associated with magmatic rocks.The 3He/4He ratios range in 2.02 × 10~(-6)～8.34 × 10~(-6) and ~(40)Ar/~(36)Ar ratios range in 628.9～3178.The higher ~3He/~4He and ~(40)Ar/~(36)Ar ratios in CO_2 gas pools prove a major mantle-magmatic origin of the noble gases,with a part of crustal source gas mixed.The average ~4He/~(40)Ar~* of 2.15 shows a slow degassing rate of magma.Its formation mechanism can be interpreted as follows: During the magma rising,the pressure and temperature would decrease,the magma composition would change,and the solubility of CO_2 and noble gases in magma would also decrease.Consequently,the CO_2 and noble gases could be separated from the magma,and large amount of CO_2 and rare gases could be transported to the various stratigraphic traps along the deep faults and some second-and third-order faults.