【摘要】 通过大量的岩心观察、野外剖面观测以及钻测井资料、分析化验数据的分析,对鄂尔多斯盆地延长组事件沉积进行研究。研究结果表明,研究区存在地震事件、火山事件、缺氧事件和重力流沉积事件;通过对各事件沉积物基本特征的认识以及这些事件沉积之间的时空组合关系的详细研究,发现这些事件沉积并非独立存在,彼此之间联系紧密:时间上,它们的高潮期均发生在长7早期,空间上,它们互相共生并与延长期湖盆的充填史有关;自湖盆边缘至湖盆中心,这些事件沉积被很好地记录下来,深湖区发育缺氧事件形成的优质烃源岩、因地震事件及火山事件而触发形成的重力流沉积事件砂体,它们形成了鄂尔多斯盆地延长组重要的岩性油气藏。结合盆地的构造史分析认为,这些事件沉积是秦岭造山事件的响应。更多还原

【Abstract】 Based on the observations of a great number of core, well log data, field investigation and analyzing the data of analysis assay, the event deposit of Yanchang Formation are researched in Ordos Basin. The results show that there are some event deposit in the basin, such as seismic event, volcanic event, anoxic event and gravity flow event. It is founded that these event deposit are independent of each other through the recognizing of seismic events sediment characteristics and careful studing on the spatial assemblage characteristics among the event deposit.These event doposits have close relationship between each other.In the time domain, the activity peak of all event deposit is appearance in early Chang 7. In the space domain, they have mutual paragenesis and relationship with the evolution of lake basin.These event deposits are recorded from margin to central of lake basin. The most important lithologic reservoir is formed by high quality source rocks because of the anoxic event and gravity flow sand body triggered by seismic event or volcanic event in deep water.This paper shows that these event deposits are the response on the Qinling orogenic event with the tectonic history analysis in Ordos Basin.更多还原