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莺歌海盆地泥-流体底辟构造成因机制与天然气运聚

, PP. 118-125

Keywords: 莺歌海盆地,泥-流体底辟,不均衡压实,热作用,幕式充注

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Abstract:

莺歌海盆地的泥-流体底辟构造发育演化是区域构造应力场变化和超压体系形成演化的结果。与盆地构造类型密切相关的不均衡压实和热作用引起盆地超压体系的发育,而区域构造应力场变化则导致盆地中中新世以泥底辟作用为主,晚中新世―第四纪以流体底辟作用为主,其中,早期泥底辟阶段形成的构造形态对晚期流体底辟作用有显著的控制作用。在莺歌海组浅层底辟圈闭中,圈闭形成期与中新统气源岩生烃过程的匹配是造成含不同天然气组分的流体发生幕式充注的主要原因。

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