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运用沉积相分析理论对鄂尔多斯盆地定边-安边地区晚三叠世延长组坳陷湖盆缓坡型三角洲前缘沉积微相组合进行系统研究,共识别出其组合形式有:水下分流河道叠加组合、河口坝叠加组合、水下分流河道与河口坝叠加组合以及河口坝与远砂坝、席状砂的叠加组合等4大类9种类型。并深入研究三角洲前缘沉积微相组合的时空分布规律,以三角洲前缘坡折带为界,将三角洲前缘分为“台型前缘”、“坡型前缘”和“盆型前缘”三部分,各部分有独特的沉积微相组合形式。高分辨率层序地层学的基准面旋回原理和沉积物体积分配原理表明:短期基准面的规律性变化影响着储层砂体的成因类型、叠加组合形式和空间分布规律,据此建立坳陷湖盆三角洲前缘不同沉积微相组合的成因分布模式。
Sedimentary facies analysis theory is applied to systematically study the sedimentary microfacies assemblages of gentle-slope delta front in the Late Triassic Yanchang Formation depression in Dingbian-Anbian area, Ordos Basin. The combination forms of underwater sedimentary channel superimposition The combination of the river mouth dam superposition combination, the combination of the underwater distributary channel and the estuary dam, and the combination of the mouth bar and the distal sand bar and the sand-like sand. And delves into the spatial and temporal distribution of sedimentary micro-facies assemblages in the delta front. Taking the delta front slope break zone as a boundary, the delta front is divided into “front”, “front” and “front” Basin-shaped front edge "three parts, each part has a unique combination of sedimentary microfacies. The principle of high-resolution sequence stratigraphy and the principle of volumetric distribution of sediments show that the regularity of short-term basement changes the type of formation, the combination form and the spatial distribution of reservoir sand, so as to establish the depression Genetic distribution patterns of different sedimentary microfacies in the delta front of the lake basin.