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在四川盆地东部宣汉向斜的亭子铺鞍部地带,地震反射时间剖面上出现了浅层凹弧与中深层凸弧紧接的“反背”现象。经多个模型的正演分析,证实了该处中深层确为与浅层相背的“反背”背斜。文中还就“反背”的形成机制进行了探讨。
In the saddle zone of pavilion in the Xuanhan syncline in the eastern Sichuan Basin, the “anti-back” phenomenon of shallow concave arc and mid-deep convex arc occurs in the seismic reflection time profile. The forward analysis of multiple models confirms that there is a “reverse” anticline in the middle of this area. The article also discusses the formation mechanism of “anti-back”.