准噶尔盆地西北缘三叠纪沉积体系与环境

发布时间：2018-06-26 14:02

本文选题：准噶尔 + 沉积　；参考：《地质通报》2017年06期

【摘要】：准噶尔盆地西北缘三叠系沉积体系划分与沉积环境演化是新疆地区值得探讨的2个问题,其中沉积微相的研究对恢复古环境及油气有利相带的预测有着重要的意义。综合运用露头、岩心、测井、地震资料,认为准噶尔盆地西北缘三叠系为冲积扇-扇三角洲,河流-三角洲和湖泊三类体系的组合,冲积扇-扇三角洲体系主要发育辫状河道、砂(砾)质漫滩等微相,河流-三角洲体系包含砂质和砂砾质辫状河,该体系进一步划分为分流河道、心滩、河漫滩、河漫湖、河漫沼泽等微相,湖泊体系以滨浅湖泥为主。此外,孢粉及C、O同位素分析显示,克拉玛依组上段所属时代为中三叠世,且盆地西北缘在三叠纪处于陆相环境。早—晚三叠世,盆地由干旱炎热的亚热带气候逐渐转为潮湿温暖适宜植被生长的温带气候。
[Abstract]:The classification of the Triassic sedimentary system and the evolution of sedimentary environment in the northwestern margin of Junggar Basin are two problems worthy of discussion in Xinjiang. The study of sedimentary microfacies is of great significance for the restoration of paleoenvironment and prediction of favorable facies zones for oil and gas. Using outcrop, core, logging and seismic data, it is considered that the Triassic system in the northwestern margin of Junggar Basin is a combination of alluvial fan delta, river delta and lake system, and the alluvial fan delta system mainly develops braided river channels. The fluvial delta system consists of sandy and sandy braided rivers. The system is further divided into distributary channels, core banks, rivers and swamps, and the lacustrine system is dominated by shore-shallow lake mud. In addition, the analysis of sporopollen and Con O isotopes shows that the upper member of the Karamay formation belongs to the Middle Triassic, and the northwestern margin of the basin is in a continental environment during the Triassic. From early to late Triassic, the basin gradually changed from arid and hot subtropical climate to humid and warm temperate climate suitable for vegetation growth.
【作者单位】：中海石油(中国)有限公司上海分公司;河南理工大学资源环境学院;中国地质科学院地质研究所;
【基金】：国家科技重大专项《全国油气基础地质研究与编图》(编号:2011ZX05043-005) 中国地质调查局项目《西太平洋大陆边缘深部过程与成矿作用研究》(编号:1212011120181) 国家自然基金项目《陆相遗迹化石对二叠纪末大绝灭事件的响应特征——以豫西下三叠统为例》(批准号:U1204404)
【分类号】：P534.51;P618.13

【相似文献】