It was introduced, about the Paleogeography sedimentary background of Bayanhua Group in Baiyinchagan Sag in the article. Based on a great quantity of geological data, sedimentary characteristics of braided river delta, such as lithology, architecture, sedimentary structure and sequence, were analyzed. Braided river delta is a kind of sedimentary type favorable for oil-gas enrichment in continental sedimentary basins. Braided channel in braid delta plain and underwater distributary channel in braid delta front can both form favorable reservoir, associated with cap rock vertically, creating favorable hydrocarbon reservoir conditions.%介绍了白音查干凹陷巴彦花群古地理沉积背景,依据大量的地质、钻井、录井及岩心资料,对都红木组及腾格尔组沉积的辫状河三角洲岩性、结构、沉积构造及其沉积序列等沉积特征展开详细分析.辫状河三角洲是沉积盆地中与油气富集有着紧密联系的沉积相型,期中三角洲平原辫状河道以及前缘水下分流河道构成相对较好的储层,在垂向上构成良好的储盖组合关系,创造了优势油气成藏条件.
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