宣龙坳陷新元古界下马岭组沉积相特征研究

Characteristics of sedimentrary facies of Neoproterozoic Xiamaling Formation reservoir in Xuanlong Depression

罗顺社 吕奇奇 尚飞 李琳静

长江大学油气资源与勘探技术教育部重点实验室;长江大学地球科学学院;

1.MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources, Jingzhou 434023, China; 2.College of Geosciences, Yangtze University, Jingzhou 434023, China

河北省怀来县赵家山地区新元古界青白口系下马岭组为一套碎屑岩沉积,主体岩性为灰绿色—灰黑色页岩及灰色含铁粉—细砂岩,该组地球化学特征明显,其值随沉积相带发生明显的规律变化;通过对该地区野外仔细观察、测量,结合室内薄片资料和地球化学分析,认为该地区下马岭组可划分为滨岸和浅海陆棚2个相带及近滨、过渡带以及滨外陆棚3种亚相。并总结出该地区的下马岭组的沉积相模式。

Neoproterozoic Xiamaling Formation reservoir of Qingbaikou System in Zhaojiashan Area, Huailai County, Hebei Provence is a set of clastic rock depositions and the main lithology is grey green-gray black shale and iron-containing siltstone-fine sandstone. The geochemical characteristics are obvious in the formation and its value indicates a regular change as the sedimentary facies change. Based on the field observation and measurement, and combined with the slice data and geochemical analysis, it is considered that the sedimentary facies of Xiamaling Formation in Zhaojiashan Area can be divided into shoreline facies and
shallow-sea continental shelf facies, which can be further classified as three subfacies: onshore zone, transitional zone and offshore shelf. The sedimentary facies modes of Xiamaling Formation are summarized.