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砂岩侵入体的形成机制分析*

DOI: 10.7605/gdlxb.2012.06.004, PP. 727-732

Keywords: 砂岩侵入体,形成机制,超压,盖层破裂,差异压实

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Abstract:

砂岩侵入体是指深水沉积砂体受到外界的触发,并在一定条件下形成超压,致使上覆弱渗透性沉积物等围岩发生破裂,砂体以流化和液化的形式向周围沉积物产生侵入。砂岩侵入体的形成过程为形成超压、盖层破裂、产生液化和流化、发生侵入。差异压实、地震引发的液化、流体的加入和压力传递等多种因素都可以使砂岩中形成超压,当地层压力达到并超过破裂压力时,发生水力破裂,或地震引起上覆地层破裂,超压砂岩发生流化,侵入到低渗透围岩中。大量未固结的深水沉积砂岩、低—非渗透层的快速覆盖、形成超压的机制和触发事件是砂岩发生侵入的必备条件。

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