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地质论评  2006 

嫩江组二段底部标志层岩石矿物学特征与成片套损因素新认识

Keywords: 成片套损嫩江组二段底部标志层岩石矿物学力学薄弱面大庆油田

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Abstract:

大庆油田嫩江组二段底部与嫩江组一段顶部成片套损严重,从前一直认为泥岩吸水膨胀、蠕变是导致成片套损的主要因素。成片套损位置研究发现,嫩江组二段底部与嫩江组一段顶部成片套损实际集中于嫩江组二段底部标志层内,而嫩江组二段底部标志层岩石矿物学特征综合研究结果表明,其不含遇水膨胀的蒙脱石,且粘土矿物含量也低于其上下相邻岩石,表明其遇水膨胀与蠕变较弱,岩石遇水膨胀与蠕变不会构成成片套损的主要原因。嫩江组二段底部标志层岩石岩心观察描述、镜下鉴定、矿物成分综合测试和岩石强度性质研究发现,嫩江组二段底部标志层泥岩为富含长英质的质地坚硬岩石,含粘土矿物较少,不含蒙脱石,岩石吸水能力差、膨胀与蠕变能力弱;标志层中存在多个化石富集带,化石沿岩石层理分布形成沿层理方向的区域性力学薄弱面;沿化石层层理的抗张强度与抗剪强度远低于其他层位和垂直于层理方向的强度性质。因此,一旦注入水进入嫩江组二段底部标志层,富含化石的岩石沿岩石层理优先发生破坏,并迅速扩展,形成成片套损现象。

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