恢复原生沉积构造的原始产状要素，是古水流分析中的一项重要基础工作。
To restore the original occurrence condition of a primary sedimentary structure is a routine work for palaeocurrent analysis.
本文重点研究了雪山组的地层特征、古水流特征以及砂岩碎屑组分特征，在此基础上简单分析了其沉积相特征。
This paper aims to analyze the stratigraphic and petrological characteristics, the palaeocurrent, and the clastic compositions of Xueshan Formation.
古水流方向与物源分析研究表明，延长组长4 + 5期，有东北部和西南部两个主物源方向。
Research on paleocurrent directions and provenances indicate northeast and southwest direction are the two major sediment resources of Chang 4 + 5oil-bearing bed.
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