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上三叠统延长组长63油层是鄂尔多斯盆地华庆地区重要的勘探目的层。笔者从取心井岩心与测井资料入手,通过对长63油层沉积相精细研究,认为长63油层为三角洲前缘湖底滑塌浊积扇沉积。按沉积特征可进一步划分出内扇、中扇和外扇3个亚相及若干微相,并对各亚相、微相特征进行了描述。其中以中扇分支水道微相最为发育,占整个浊积扇面积的80%。在此基础上,对有利沉积微相、沉积相平面展布规律及沉积模式进行了预测。
The Upper Triassic Yanchang Formation 63 reservoir is an important exploration target in the Huaqing area of the Ordos Basin. Starting with the coring well and well logging data, the author studied the sedimentary facies of Chang 63 reservoir and concluded that the Chang 63 reservoir is a turbidite turbidite deposition in the delta front. According to the sedimentary characteristics, three subfacies and several microfacies of inner fan, mid fan and outer fan can be further divided, and the characteristics of each subfacies and microfacies are described. Among them, the water-phase microfacies in the middle-fan branch was the most developed, accounting for 80% of the total turbidite fan area. On the basis of this, the favorable sedimentary microfacies, depositional plane distribution law and sedimentary model were predicted.