摘要
在中-晚奥陶世,塔里木板块北部英买力-哈拉哈塘油田地区为向西南方向倾斜的陆表海灰岩缓坡区,东部井区的生物-沉积相显著比西区的英买201井、英买202井偏浅。达瑞威尔阶一间房组和凯迪阶良里塔格组沉积期频繁出现生屑-内碎屑滩,在东北井区尤为发育;西南井区的一间房组和良里塔格组生物-沉积相则可识别出潮下低能带沉积。一间房组上部的灰岩序列指示海进发生,之上的桑比阶吐木休克组沉积期达到最大海进而普遍沉积浪基面之下的灰泥为主的非滩相,生屑含量偏低;良里塔格组海退期平缓海底的小型藻丘和灰泥丘分布十分局限。
The Middle to Late Ordovician carbonates in the Yingmaili-Halahatang Oil Field,northern Tarim Block represent a carbonate ramp whose depth increased toward the southwestern wells of Yingmai 201 and Yingmai 202.Bioclasts and intraclasts are the key components forming shallow marine banks in the Darriwilian Yijianfang and Katian Lianglitag formations and frequently occurring in northeastern wells.Equivalent bio-and sedimentary facies in the southwestern wells suggest a deeper and calm subtidal environment.Limestone sequences from the upper Yijianfang formation indicate a transgressive episode.The lime mud-dominated deposits contain less biogenic components,representing essentially units below the storm wave-base during maximum sea-level rise of the Sandbian Tumuxiuk formation.Small-scale algal reefs and mud mound are limited spatially due to gentle marine topography resulting from regression of the Lianglitag formation.
作者
张园园
王冠
张云峰
李越
ZHANG Yuanyuan;WANG Guan;ZHANG Yunfeng;LI Yue(State Key Laboratory of Paleobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008;CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301;School of Geoscience and Technology,Southwest Peroleum University,Chengdu 610500)
出处
《微体古生物学报》
CSCD
北大核心
2019年第4期337-350,共14页
Acta Micropalaeontologica Sinica
基金
国家自然科学基金(750100509,41072002)
中国科学院战略性先导科技专项(B类)XDB26000000资助.
