天然气地球科学 ›› 2021, Vol. 32 ›› Issue (2): 164173.doi: 10.11764/j.issn.1672-1926.2020.11.007
韦腾强1(),吴长江1,黄亚浩2(),洪海涛1,王小娟1,唐友军2,潘珂1
Teng-qiang WEI1(),Chang-jiang WU1,Ya-hao HUANG2(),Hai-tao HONG1,Xiao-juan WANG1,You-jun TANG2,Ke PAN1
摘要:
致密气勘探是中国非常规能源战略的重要组成部分,四川盆地中部金秋气田侏罗系沙溪庙组致密气多期河道立体勘探连续取得上产突破,致密气藏烃类流体演化过程分析是致密气成藏机理研究的关键。以四川盆地中部秋林、金华气田侏罗系沙溪庙组储层砂岩岩心为研究对象,基于岩石学观察和原位显微拉曼光谱观测,发现储层成岩矿物赋存有纯CH4气包裹体、纯CO2气包裹体、混合CH4—CO2气包裹体和富N2气包裹体4类。通过流体包裹体定量拉曼分析和热力学模型得到了含CH4和CO2包裹体的压力—温度—时间—组成(PVT—x)性质,利用CO2费米双峰的间距计算出纯CO2包裹体的密度,并发现2期CO2流体成藏阶段:原生CO2成藏期(高密度:0.874~1.020 g/cm3; 高均一温度:>210 oC)和次生CO2成藏期(高密度:0.514~0.715 g/cm3; 低均一温度:约180~200 oC)。异常高均一温度的CO2流体推测深部热液流体活动产生,并对储层产生侵位作用。通过甲烷拉曼v1伸缩振动峰计算的甲烷包裹体捕获时古流体压力为44.0~58.5 MPa,平均古压力系数为1.29,提供了恢复压力演化的重要证据。油气成藏于白垩纪晚期(约75~65 Ma),此时期接近于早喜马拉雅隆升早期(地层埋藏最深阶段),晚期有机气驱替早期无机CO2成藏。流体包裹体古压力恢复表明储层是从弱超压到常压状态的演化过程,抬升早期弱超压指示气藏具有较好的保存条件。
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