同沉积断裂构造对沉积相展布的控制——以黄河口凹陷沙三中亚段沉积相研究为例

研究表明,黄河口凹陷沙河街组三段中亚段发育的沉积相类型有辫状河三角洲相、扇三角洲相、湖底扇相和湖泊相。同沉积断裂特征对沉积具有控制作用,陡坡带活动盆缘断裂控制扇三角洲的分布,缓坡带活动盆缘断裂控制辫状河三角洲分布;二级断裂对湖底扇和深水沉积区有明显的控制作用,东部断阶带中部发育的F20东西向同沉积断裂,控制了物源的主要注入通道——沟谷,对东部物源的注入具有长期影响。

Syndepositional fault controls on the distribution of sedimentary facies: An example from the sedimentary facies in the middle submember of the third member of the Shahejie Formation in the Huanghekou depression,Shandong

Sedimentary facies developed in the middle submember of the third member of the Shahejie Formation in the Huanghekou depression consist of the braided delta, fan delta, sublacustrine fan and lacustrine facies. The controls of the syndepositional faults are manifested in： （ 1 ） the controls of the active basin-margin faults in the steep slope zone on the distribution of the fan delta facies ; （2） the controls of the active basin-margin faults in the ramp zone on the distribution of the braided delta facies ; （3） the controls of the second-order faults on the sublacustrine fan facies and deep-water depositional areas, and （4） the controls of the F20 E-W trending syndepositional faults in the middle part of the eastern fault terraces on gullies and valleys as the main channels for sediment supply.