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通过岩心观察、薄片鉴定,沉积构造特征和测井相分析,结合区域地质背景,对姚店油田延长组长6油层的沉积特征及沉积模式进行研究。确定该区为三角洲平原沉积和三角洲前缘沉积,三角洲平原沉积可划分为水上分流河道、天然堤、河漫滩3种微相;三角洲前缘沉积又划分为水下分流河道、水下天然堤、水下决口扇、分流间湾4种微相类型,并对各小层沉积微相平面特征进行研究。结果表明,由长64至长61亚相,砂体分布范围逐渐扩大,分流河道沉积逐渐发育。
The sedimentary characteristics and sedimentary model of Chang 6 reservoir of Yanchang Formation in Yaodian Oilfield are studied by core observation, thin slice identification, sedimentary structural characteristics and logging facies analysis, combined with the regional geological background. It is confirmed that the area is delta plain sedimentation and delta front deposition. Delta sediments can be divided into three kinds of microfacies: water distributary channel, natural embankment and river floodplain. The delta front sediments are divided into underwater distributary channel, underwater natural dike, water The next sector fan, shunt bay four kinds of microfacies type, and the small sedimentary microfacies planar characteristics of the study. The results show that the distribution range of sand body gradually expands from 64 to 61, and distributary channel sediments develop gradually.