论文部分内容阅读
利用测井资料,运用高分辨率层序地层学理论及方法,对川东北黄龙场-渡口河构造须家河组须四-须五段进行不同级次的基准面旋回层序划分,识别出1个长期、2个中期、13个短期基准面旋回层序,并对短期基准面旋回层序的结构类型和叠加样式进行较为深入的讨论。在单井分析的基础上,以二分时间单元分界线为优选等时对比标志对不同级次的基准面旋回进行较高精度的等时对比,建立了研究区须四-须五段高分辨率层序地层格架。讨论了中、短期基准面旋回过程中有利储集砂体的沉积相类型和控制因素,指出中期基准面旋回早期的短期基准面上升半旋回可形成最有利储集砂体,沉积微相为三角洲平原分流河道和三角洲前缘水下分流河道。
Using well logging data and high-resolution sequence stratigraphy theory and method, we divided up the Xujiahe-Xuchang section of Xujiahe Formation in the Huanglongchang-Dukouhe tectonic Xujiahe Formation of northeastern Sichuan into different levels of reference cycles and identified 1 long-term, 2 medium-term, and 13 short-term base-level cycles. The types and superposition patterns of short-term base-level cycles are discussed in more depth. On the basis of single well analysis, the isochronic comparison of different levels of reference plane cycles with higher precision is established by taking the bisectional unit boundary line as the preferred isochronous marker, and the high resolution Sequence stratigraphic framework. The type and controlling factors of sedimentary facies in favorable reservoir sandbodies during mid- and short-term base-level cycles are discussed. It is pointed out that the early half-cycle of mid-term base-level cycles can form the most favorable reservoir sand bodies and the sedimentary microfacies are delta Plain distributary channel and delta front underwater diverting channel.