陈世加,王力,姚宜同,黄囿霖,路俊刚,刘超威,张焕旭,张潇文
CHEN Shi-jia,WANG Li,YAO Yi-tong,HUANG You-lin,LU Jun-gang,LIU Chao-wei,ZHANG Huan-xu,ZHANG Xiao-wen
摘要:
川中西部侏罗系大安寨段高气油比油井广泛分布,大安寨段油井也主要分布在高气油比井较多的地区,研究天然气成因对认识川中大安寨段油气富集规律具有重要的意义。通过川中西部侏罗系大安寨段天然气与其下伏上三叠统须家河组天然气组分和碳同位素对比分析,并结合大安寨段凝析油轻烃特征研究表明:川中西部大安寨段高气油比井的天然气呈现腐殖型或偏腐殖型天然气特征,与下伏须家河组天然气特征相似,认为川中西部大安寨段高气油比井形成原因是大安寨段烃源岩生成的腐泥型天然气与须家河组腐殖型天然气混合的结果。在存在断穿大安寨段地层的断裂区域内,下伏须家河组天然气沿断裂侵入:一方面溶解了大安寨段原始油藏中的轻组分,并沿断裂运移到大安寨段以上地层散失|另一方面引起脱沥青作用充填靠近断裂处的大安寨段储层孔隙及裂缝,从而使得紧邻断裂处大安寨段储层勘探效果较差。
中图分类号:
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