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    冀中坳陷深县凹陷的生长断层特点及其对沉积的控制作用

    Growth faults in Shenxian depression and their control over the sedimentation

    • 摘要: 提要:众所周知,构造控制沉积,沉积控制储层,但多数沉积相图的编制并没有系统考虑构造对沉积的控制作用,因而造成沉积相或古地理图与同生构造格局不匹配的严重缺陷。这里所指的构造主要是生长断层,而活动方式会对沉积地层有明显的控制作用。深县凹陷的生长断层可以划分为4种模式:晚期活动模式、持续活动模式、间歇活动模式及深部扩展模式。在此基础上,本文根据断层的活动变化特点并结合区域物源分析,系统地讨论了深县地区的生长断层对该区沉积格局的控制作用,在总体沉积格局表现为“南部水下扇、北部三角洲”的基础上,两大沉积体系前缘的同生断层分布控制砂体的进一步展布,呈现出平面顺断朵状分布、剖面垂向楔形叠加的沉积特点。

       

      Abstract: Abstract:As we all know, structure controls sedimentation, while sedimentation controls the reservoir. Lots of sedimentary facies maps, however, were compiled without considering the control of structural factors over the depositional system, which has led to the severe defect that sedimentary facies or/and palaeogeographic maps do not match with contemporaneous structural configuration. Growth faults are the main structural factors, whose activity would control the forming process of sedimentary strata. There were four types of growth faults developed in Shenxian depression in Cenozoic, constituting models of late activity, continuous activity, periodic activity and deep extension. In addiction, based on regional sediments provenance analysis, the authors probed into the control of growth faults over depositional systems, and found that subaqueous fans were developed in the south while deltas were developed in the north. The spread of the fronts of these two depositional systems were further controlled by growth faults, presenting characteristics that lobes spread along faults on the map while wedges overlap in the cross section.

       

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