大型浅水扇三角洲发育的沉积物理模拟实验研究

发布时间：2018-02-11 04:47

本文关键词： 准噶尔盆地玛湖凹陷百口泉组扇三角洲沉积体系物理模拟实验　出处：《新疆石油地质》2017年03期 　论文类型：期刊论文

【摘要】：新疆油田环玛湖地区勘探成果显著,发现了数亿吨的地质储量,揭示了这一地区良好的油气潜力。勘探实践表明,这一地区的沉积体系不同于早年发现的冲积扇沉积体系,而是一种具有浅水、缓坡的扇三角洲沉积体系。为深入认识这种沉积体系的沉积特点及其形成机制,采用长江大学水槽模拟实验装置,对其形成过程进行了模拟实验研究。模拟实验设计了3级坡折和3期主要的湖平面变化,分别对应于百一段、百二段和百三段3个沉积时期,采用重力流和牵引流相间隔的方式模拟扇体的形成过程。模拟结果表明,3个阶段由于湖平面的上升,造成一种退积层序,不同层序之间呈现出明显的上超现象。而对于储集层的内部结构考察表明,其在扇三角洲平原区更多地体现出一种层状结构的重力流和河流交互沉积,其在前缘部位可能更多的是前积作用所形成的牵引流沉积和次生重力流沉积。不同时期的重力流和前积所形成的扇体边界不清晰,比较难于区分。而在沉积过程中,湖平面的位置、坡折、沉积能量(古地形高程)和沉积物的构成对扇的发育具有明显的影响。
[Abstract]:The exploration results in Huanmahu area of Xinjiang oil field are remarkable, and hundreds of millions of tons of geological reserves have been discovered, which reveals the good oil and gas potential in this area. The exploration practice shows that the sedimentary system in this area is different from the alluvial fan sedimentary system discovered in the early years. It is a fan delta sedimentary system with shallow water and gentle slope. Simulation experiments were carried out to study its formation process. The third grade slope break and three major lake level changes were designed in the simulation experiment, corresponding to three sedimentary periods of Baiyi member, hundred second member and hundred three member, respectively. The forming process of fan body is simulated by the separation of gravity flow and traction flow. The simulation results show that the three stages caused a retrogression sequence due to the rise of lake level. The study of the internal structure of the reservoir shows that the stratified gravity flow and fluvial interaction are more likely to be reflected in the fan delta plain. It is more likely to be the traction flow deposition and secondary gravity flow deposition in the front edge. The boundary of fan body formed by gravity flow and forward accumulation in different periods is not clear, and it is difficult to distinguish between them. The location of lake plane, slope break, sedimentary energy (paleotopographic elevation) and sediment composition have obvious influence on fan development.
【作者单位】：中国石油新疆油田分公司勘探开发研究院;长江大学地球科学学院;
【基金】：国家自然科学基金(41672119)
【分类号】：P618.13

【相似文献】