蒋婵1,谷一凡2,张洁伟3,蒋裕强2,徐昌海4,廖义沙5
Jiang Chan1,Gu Yi-fan2,Zhang Jie-wei3,Jiang Yu-qiang2,Xu Chang-hai4,Liao Yi-sha5
摘要: 基于四川盆地龙岗东地区长兴组礁滩储层的充注序列、流体包裹体、激光拉曼分析,对比潜在烃源岩生物标志化合物,认为长兴组储层存在多期流体充注,充填序列包括:第一期次方解石→沥青→第二期次方解石;沥青→萤石→石英→第二期次方解石等。第一期次方解石代表浅埋藏环境中正常地层流体充注;储层沥青来源于龙潭组烃源岩;萤石、石英具有异常高温,代表热液流体充注,含沥青包裹体(含油包裹体的裂解产物)富集表明热液流体充注与龙潭组生烃时期匹配;第二期次方解石代表中—深埋藏中正常地层流体充注,表明总体具有3期油气充注阶段:第一期为早侏罗世中—晚期(约190~175Ma)的少量龙马溪组天然气充注,对应长兴组地层温度约为110~130℃。第二期为中侏罗世到晚侏罗世早期(约175~160Ma)的龙潭组生油高峰期充注,形成大量含油包裹体,伴生大量含甲烷气—液两相包裹体,地层温度为130~140℃。第三期为早白垩世中晚期—晚白垩世中期(约120~90Ma)的原油裂解成气过程(地温超过160℃),伴生大量储层沥青。关键充注时期的逆断层活动是后期保存条件被破坏的主要原因。
中图分类号:
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