李剑1,2,郝爱胜1,2,齐雪宁1,2,陈旋3,国建英1,2,冉启贵1,2, 李志生1,2,谢增业1,2,曾旭1,2,李谨1,2,王瑀1,2,4,刘如红1,2,4
Li Jian1,2,Hao Ai-sheng1,2,Qi Xue-ning1,2,Chen Xuan3,Guo Jian-ying1,2,Ran Qi-gui1,2,Li Zhi-sheng1,2,Xie Zeng-ye1,2,Zeng Xu1,2, Li Jin1,2, Wang Yu1,2,4, Liu Ru-hong1,2,4
摘要: 中国西北地区侏罗系煤系地层广泛发育,主要分布于塔里木、准噶尔、柴达木和吐哈等盆地,煤成气资源非常丰富。中国西北地区侏罗系虽然具有相似的构造及沉积背景,但其形成的煤成气地球化学特征既有相似性,又有差别,因此,分析总结不同盆地侏罗系含油气系统的煤成气地球化学特征和勘探潜力,对寻找不同类型的煤成气藏具有重要的借鉴意义。通过综合对比分析认为中国西北地区侏罗系煤成气的干燥系数呈现“湿气单峰型”、“湿气—干气双峰型”和“干气单峰型”3种类型;δ13C1值分布范围大,对应烃源岩从低熟到过成熟完整的序列;出现的部分C2和C3的同位素倒转主要是混源作用和生物作用造成的;烃源岩成熟度是造成不同地区天然气地球化学差异的主要原因。西北地区侏罗系煤成气勘探潜力大,构造气藏的勘探程度相对较高,构造—岩性、岩性气藏是西北地区侏罗系煤成气未来的主要勘探类型;塔里木盆地库车坳陷的侏罗系、准噶尔盆地南缘的白垩系—侏罗系、吐哈盆地侏罗系高成熟煤成气和柴达木盆地侏罗系高—过成熟煤成气勘探潜力大,是未来西北侏罗系煤成气勘探的重要领域。
中图分类号:
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