四川盆地古隆起特征及对天然气的控制作用

CHARACTERISTICS OF PALEO-UPLIFTS IN SICHUAN BASIN AND THEIR CONTROL ACTION ON NATURAL GASES

四川盆地在不同地质历史时期 ,形成了不同规模及不同控气作用的古隆起。加里东期的古隆起因受后期多期改造 ,分布复杂 ;海西 -印支期主要发育开江古隆起 ,为继承性发育的古隆起 ;印支期泸洲古隆起是川西前陆盆地的前隆 ;燕山期的江油 -绵竹和大兴两个古隆起明显向坳陷扩展。上述古隆起不仅改造了储层性能 ,其古圈闭为油气早期聚集提供了场所 ,而且延缓了生烃时间 ,有利于油气晚期成藏。因此 ,四川盆地的古隆起是油气勘探的重要领域。

Different paleo uplifts in Sichuan Basin formed in differnt geological ages.The uplifts formed in Caledonian period are complicated in distribution;the one formed in Hercynian Indosinian period is Kaijiang inherited paleo uplift;Luzhou paleo uplift formed in Indo sinian is the front zone of west Sichuan foreland basin;the Jiangyou Mianzhu and Daxing Uplifts extened towards depression.These uplifts did not only reformed reservoir property,their traps also provided the site for hydrocarbon accumulation in the early stage,and favourable for oil and gas pool forming.So it is suggested that the paleo uplifts in Sichuan Basin are important realms for oil and gas exploration.