天然气地球科学 ›› 2022, Vol. 33 ›› Issue (9): 14601475.doi: 10.11764/j.issn.1672-1926.2022.04.007
张喜龙1,2,3(),杨兴4,周飞5,鞠鹏飞6,陈永欣1,曹占元1,夏燕青1(),张晓宝1
Xilong ZHANG1,2,3(),Xing YANG4,Fei ZHOU5,Pengfei JU6,Yongxin CHEN1,Zhanyuan CAO1,Yanqing XIA1(),Xiaobao ZHANG1
摘要:
为探究深层环境“煤系”烃源岩生排烃潜力及生烃机理,利用WYMN?3型高温高压(HTHP)模拟仪对柴达木盆地北缘DMG1井中侏罗统烃源岩(Ⅲ型有机质,炭质泥岩和煤的RO值分别为0.67%和0.64%)进行了半开放体系温压共控条件下的生排烃模拟实验。结果显示:①炭质泥岩和煤的最大总油产率分别为79.38 mg/gTOC和37.30 mg/gTOC,且总油产率整体呈“双峰”型演化规律;②较低演化阶段(T≤300 ℃,P≤42.0 MPa),2类源岩的排出油产率均小于残留油产率,排烃效率较低,但在400 ℃(51.0 MPa)排油/烃率大幅增加,分别达到了76.84%和83.72%;③排出油族组分主要为非烃和沥青质,其族组分产率演化特征也与液态烃产率演化规律总体相似,炭质泥岩排出油族组分产率整体较煤的族组分产率高;④模拟气主要由烃类气和非烃气(CO2、N2)组成,气态烃产率随着热演化程度的增加而升高,2类源岩最大烃类气产率分别为116.46 mL/gTOC和36.85 mL/gTOC;⑤镜质体反射率(RO)均随温压条件的升高而增加,与温度呈良好的一致性变化规律。此次温压共控模拟实验结果表明,温度仍然是有机质热演化的主要因素,流体压力对Ⅲ型有机质烃产物的形成具有“双重”控制作用,“煤系”烃源岩在高过演化阶段仍具有较强生烃潜力。该研究为进一步认识柴达木盆地北缘侏罗系深层“煤系”烃源岩生排烃规律提供了一定的数据参考。
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