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以陕甘宁盆地姬塬地区晚三叠系延长统为例,将该区的三角洲前缘划分为“台型前缘”和“坡型前缘”两部分,其识别标志是以水下分流河道、复合河口坝(坝上河)和河口坝三种主要沉积微相为主导的多种微相的不同组合。文中对三角洲前缘中的沉积微相组合进行了精细划分和描述,例如,将水下分流河道划分为截削式和叠加式2种,将河口坝划分为完整式和复合式两大类,其中复合式河口坝(坝上河)还可划分为下残坝上河、完整坝上河和上残坝上河三种亚类型。这种对三角洲前缘的详细解释以及对其沉积微相的精细描述有助于优质储层的鉴别和分布预测,对油藏开发中的细分流动单元也有所帮助。
Taking the Late Triassic Yanchang Formation in the Jiyuan area of the Shan-Gan-Ning basin as an example, the delta front of the area is divided into two parts: “terrace front” and “slope front” The different combinations of multiple microfacies dominated by the three main sedimentary microfacies, such as channel, river mouth, compound mouth bar (Bashang River) and mouth bar. In this paper, the sedimentary microfacies combination in the delta front is subdivided and described. For example, the sub-distributary channel is divided into two types: truncated and superimposed, and the estuary dam is divided into two types: intact and compound. The composite estuary dam (dam on the river) can also be divided into the next dam on the river, a complete dam on the river and Shangba dam on the river three subtypes. This detailed explanation of the delta front and a detailed description of its sedimentary microfacies can be used to predict and discriminate high-quality reservoirs and to help subdivide flow units in reservoir development.