墨西哥Burgos盆地Perdido构造带深浅双层盐分布特征及南北差异构造形变  

Distribution characteristics of deep/shallow bi-layered salt and the North-South differential structural deformation in the Perdido structural belt of Burgos basin,Mexico

作　　者：朱钇同 李爱山 陈亮 蔺频 ZHU Yitong;LI Aishan;CHEN Liang;LIN Pin(CNOOC International Limited,Beijing 100028,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028

出　　处：《中国海上油气》2021年第6期62-70,共9页China Offshore Oil and Gas

摘　　要：墨西哥湾油气资源丰富、资源潜力巨大,复杂的盐构造变形是油气成藏的重要影响因素。为了研究复杂盐构造的变形规律,本文利用区域地质、重力和地震资料,对Burgos盆地Perdido构造带的双层盐构造开展研究,探讨了深浅双层盐的特征,从盐岩变形机制的角度说明盐构造样式的不同。研究表明,深层母盐受控于基底古构造格局,边缘隆起带控制了母盐底辟的分布;浅层盐蓬受控于母盐的重力滑脱再变形,母盐的剪切撕裂作用控制了浅层盐蓬的分布。深浅两套盐不同的空间配置关系最终决定了Perdido带南北不同的盐构造变形机制与构造样式。北段深浅双层盐构造整体变形,形成以盐底辟和冲断背斜为主的构样式;而南段深浅双层盐构造分层变形,形成了以盐核背斜和盐前滑脱逆冲为主的构造样式。Gulf of Mexico is prolific hydrocarbon area with great exploration potential,the complex salt structure deformation is critical to hydrocarbon accumulation.In this paper,based on the regional geological,gravity and seismic data,the bi-layered salt structures in the Perdido structural belt of Burgos basin are studied and the characteristics of deep/shallow bi-layered salt are discussed,which reveals the difference in salt structural styles from the perspective of salt deformation mechanism.Studies suggest that the deep parent salt is controlled by the paleo-tectonic pattern of basement,and the marginal uplift zone controls the distribution of parent salt diapirs;the shallow salt canopy is controlled by the parent salt’s gravitational slippage and re-deformation,and the distribution of shallow salt canopy is controlled by the shear and tearing of parent salt.The different spatial configurations of those two sets of salt in deep and shallow strata ultimately determine the different salt structural deformation mechanisms and structural styles in the northern and southern sections of the Perdido belt.The deep/shallow bi-layered salt structure in the northern section underwent the deformation as a whole,forming a structural style dominated by salt diapirs and thrust anticlines;while the deep/shallow bi-layered salt structure in the southern section underwent a zonal deformation,forming the structural style that is dominated by salt-core anticline and pre-salt detachment thrust.

关 键 词：Perdido构造带 双层盐分布特征 差异构造形变 构造样式 

分 类 号：TE121.2[石油与天然气工程—油气勘探]