潮水盆地侏罗系沉积体系及盆地演化

Jurassic sedimentary systemand basin evolution in tidal basin

张 磊 钟建华 钟富平 高玉飞

中国石油大学地球资源与信息学院，山东 东营 257061 中国科学院广州地球化学研究所，广东 广州 510640

College of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

潮水盆地属典型的西北侏罗系原型盆地，早在20世纪中叶就在青土井发现浅油藏。为了正确认识潮水盆地侏罗系的沉积体系，以便更好地完成该区油气藏的勘探，通过详细的野外露头剖面观察和记录，对潮水盆地侏罗系地层进行了详细认识。认为盆地发育有冲积扇、三角洲-湖泊和河流三大类沉积体系，对应的亚、微相沉积体相互叠置，横向上具可追踪性。最后，结合前人资料和岩相特征认为：潮水盆地为由早期的断陷盆地冲积扇体系，经中期盆地深陷水进演化为三角洲-湖泊体系，最后经末期水退形成河流体系的盆地演化模式。

The tidal basin is a typical basin of the northwest Jurassic prototype basin. Shallow reservoir has been found early in the middle of the last century in Qingtu oil well. In order to correctly understand the Jurassic sedimentary system of the tidal basin and make better completion of the exploration of oil and gas reservoirs in the area, the paper discussed the strata of Jurassic tidal basin in detail through the observation and record of the detailed outcrop section. It is believed that the basin has developed three main types
of sedimentary system of alluvial fan, delta-lakes and rivers. The corresponding sub-micro-depositions overlay each other with a horizontal traceability. Finally, combined with previous data and lithofacies characteristics, it concludes that tidal basin is formed by the early rift basin system of alluvial fan, evolved to the delta-lake system during the medium-term evolution of depression and aggressive water, and finally formed the river basin evolution of the system model by the withdrawal of water at the end period.