安塞油田塞160井区长6油层组沉积微相研究

Sedimentary Microfacies of the Chang-6 Reservoir in the Vicinity of Sai 160 Well

为了确定安塞油田塞160井区长6油层组沉积微相展布特征,通过岩心观察、描述和实验分析,对研究区长6油层的沉积微相类型进行细化,对各小层沉积微相的平面展布进行研究。塞160井区长6为湖泊河控三角洲前缘亚相沉积,主要沉积微相为三角洲前缘水下分流河道、分流河口坝、水下分流间湾和前缘席状砂。研究区长6三角洲沉积体系代表了较完整的自旋回过程,长63沉积期,研究区的主体被向湖区方向推进的三角洲前缘水下分流河道占据;长62期,研究区主体仍为水下分流河道沉积,但延伸较长63近;长612期维持与长62沉积模式;长611期三角洲前缘亚相发育完整,分流相带相互叠置。

In order to confirm the sedimentary microfacies of Chang-6 reservoir in the vicinity of Sai 160 well, core observing and describing, experiment data analyzing, and observation of the distribution of microfacies were performed. The main sedimentary microfaces are distributary channel, the point bar, the inter-distributaries and sands. The delta deposits system of chang-6 reservoir stands for the complete process of gyration of itself. In the Chang-63 sand-layer, the main sedimentary microface is distributary channel that extends to the lake. In the Chang-62 sand-layer, the deposit is same as the Chang-63 sand- layer, but it extends longer. In the Chang-61^2 sand-layer, the deposits model is same as Chang-62. In the Chang-61^1 sand-layer, the inlet edge subface of delta deposits is complete.