千米桥潜山构造特征及其在油气成藏中的作用

千米桥潜山是黄骅坳陷最典型的新生古储型油气藏，恢复潜山古构造是认识其油气藏特征的重点和难点之一，运用地质力学方法研究潜山内幕构造之后认为，该潜山的形成基础是古生界印支期宽缓复背斜，在燕山期挤压构造作用下形成由逆冲叠瓦扇和反冲断层构成的三角带内幕构造，抬升受侵蚀形成潜山主体，喜马拉雅的两次古旋拉张使潜山掀斜定型。晚第三纪以来发生整体热沉降，潜山两侧凹陷沙三段生成油气向潜山侧向运移成藏。

The structure feature of Qianmiqiao buried hill and its role in oil-gas accumulation

Qianmiqiao buried hill is the most typical Cenozoic generation and Paleozoic reserving pool in Huanghua depression. Restoring the buried hill is one of the key and difficuly points to penetrate into the buried hill oil gas pool. In this article, the inner buried hill structure was studied through tectonics geomechanics methods, which pointed out that on the background of Indosinian anticline, the buried hill was formed through compressional orogeny at Yanshan movement, which was twicely tilted at Himalayan epoch for dextral extension, and it occured mass heat subsidence after Neogene. The delta structure is the foundamental structure of the buried hill. The buried hill development is characterized mainly by two structural types of thrusting and imbricated fan and recoil fault. Tectonic movement was the key of oil gas accumulation in the buried hill.