The Sedimentary Characteristics and Facies Model of the Upper Member of Guantao Formation of the Eocene in Xinbei Oilfield of Shengli Petroleum Province
-
摘要: 主要通过岩心和薄片观察、粒度分析、参数计算及测井资料解释等手段，以揭示胜利油区垦东凸起北坡新北油田馆上段沉积特征及沉积相模式为目的开展工作，得到以下认识：研究区馆上段为分汊河相沉积。其粒度概率累积曲线普遍具有明显过渡段而显示与辫状河心滩相似的特征；平均河道弯曲度大于1.7，二元结构发育，具有曲流河的某些特征；以河岸抗冲性中等，决口扇较为发育而有别于网状河。在此基础上建立了研究区馆上段分汊河沉积相模式：包括河床、堤岸、河漫/洪泛平原及废弃河道亚相，组成下粗上细的正旋回。其中河床亚相砂坝微相是分汊河相的沉积主体，其次为堤岸亚相决口扇微相和废弃河道亚相。河床亚相砂坝顶部多直接覆盖洪泛平原泥质沉积。新北油田宏观上油气分布受构造控制，微观上油气富集主要受分汊河道砂体的控制。分汊河相的发现与提出有助于新北油田精细砂体预测和优化整开发方案，也为类似地区的储层预测提供了更为开阔的思路和可借鉴的地质模型。Abstract: The sedimentary character and facies model of the upper member of Guantao Formation in Xinbei oilfield of Shengli petroleum province were studied by core observation, granularity analysis, parameters count and well log analysis mainly. It's showed that the aim stratum in the studied area is the anabranched channel. Its granularity probability cumulation curves show similar character with the braided stream. The average channel sinuosity is more than 1.7 and duality structure develops, which is similar to meandering river. The developed burst fans can distinguish it with anastomosing river. The anabranched channel model in the studied area includes four subfacies, such as channel, bank, overflow and abandoned channel. The channel bars in abandoned channel subfacies are the most important sedimentary body. The burst fans and abandoning channels are more developed than that of natural levees. The top of the channel bars are often covered by flood plain successively. The distribution of petroleum in Xinbei oilfield is controlled by the anabranched channel mainly. The discovery of the anabranched channel facies can help Xinbei oilfield's fine sand body forecast and optimizing exploitation plan, and can be a useful geologic model for the reservoir forecast in other similar areas.
-
点击查看大图
计量
- 文章访问数: 2480
- HTML全文浏览量: 11
- PDF下载量: 732
- 被引次数: 0
下载:
