惠民凹陷商河油田商三区沙三上亚段浊积扇沉积特征

Sedimentary characteristics of turbidite fan in upper submember of E s_3 in the third area of Shanghe Oilfield, Huimin Sag

针对惠民凹陷商河油田商三区沙三上亚段砂体平面及纵向分布规律认识不清的问题,从岩心观察、测井资料分析、薄片分析以及区域地质背景入手,对该区浊积扇的岩石类型、粒度特征和沉积构造等进行了详细研究。研究结果表明,该区岩石类型包括粉砂岩、细砂岩和泥页岩,发育侵蚀面、沟模、粒序层理、包卷层理和火焰状构造等沉积构造以及小型同生断层构造,砂岩粒度分析显示其具有浊流沉积特征。在该区划分出了中扇和外扇亚相以及辫状沟道、沟道间、沟道侧缘和外扇泥4个微相,其中中扇亚相较为发育。分析了浊积扇纵向沉积序列及沉积微相平面演化规律,并对其控制因素进行了探讨。

Based on core observation, log data, thin section analysis and regional geological background, this paper studied the rock types, grain size characteristics and sedimentary structures of turbidite fan of upper submember of the third member of Shahejie Formation in the third area of Shanghe Oilfield. The result shows that the rock types mainly include siltstone, fine sandstone and argillutite. Erosion surface, gloove cast, grading bedding, convolute bedding, flame structure and small-sized contemporaneous fault are mainly developed. The granularity analysis result shows typical features of turbidite deposit. Middle fan which is dominant and outer fan are recognized, which can be further divided into channel, interchannel, channel lateral margin, and outer fan mud. The vertical sedimentary sequence, sedimentary facies distribution and evolution and the controlling factors were analyzed.