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基于露头剖面、岩心观测、测井对比、砂岩镜下特征等分析,综合考虑控制三角洲沉积机理的诸多因素,将区内石炭-二叠纪三角洲详细划分为4种类型,认为三角洲的沉积类型及特征受古地形、河流性质、河流水体与蓄水盆地间的密度差异、蓄水盆地水体水动力条件等因素共同控制.研究结果表明:早二叠世太原期为陆表海背景下的浅水曲流河三角洲,喷流机制属平面喷流,底流作用弱,砂体延伸不远;早二叠世山西期发育残余陆表海-近海湖泊浅水曲流河三角洲,喷流机制为轴状喷流,河控作用显著,湖泊水体改造弱;中二叠世石盒子期为近海内陆湖泊具辫状河性质的浅水三角洲,喷流机制属平面喷流,砂体延伸远,多期冲刷-叠置显著;晚二叠世石千峰期发育内陆湖泊三角洲.
Based on the analysis of outcrop profile, core observation, log comparison and microscopic characteristics of sandstone, considering the various factors that control the sedimentation mechanism of the delta, the Carboniferous-Permian delta is divided into four types in detail. The sedimentary types and The characteristics are controlled by the ancient topography, the nature of rivers, the density difference between river water bodies and water storage basins, and the hydrodynamic conditions of water bodies in the basin, etc. The results show that: the Early Permian Taiyuan period was shallow meandering river Delta, jet flow mechanism is a plane jet flow, the role of underflow is weak, the sand body extends not far; Early Permian Shanxi developed residual land surface sea - coastal lakes shallow bends River delta, jet flow mechanism for the axial jet, river control Significantly, the lake water body remodeling is weak; the Middle Permian Shi boxing period is a shallow delta with braided river near the inland lacustrine, the jet flow mechanism is a plane jet, the sand body extends far, Permian Shiqianfeng development inland lakes delta.