New understandings of the basement characteristics and evolution process of Erlian Basin
ZHANG Yiming1, LIU Zhen2, FU Sheng2, JIANG Shuanqi1, YAO Ning2, and WANG Xin1
1. Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China; 2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
Abstract：Formers thought Erlian Basin was a Mesozoic-Cenozoic basin developed on a fold basement by wide docking and soft collision during Hercynian period.But they did not specify whether Mengnan Area(namely,Ondor Sum Uplift) belongs to Erlian Basin and only regard it as uplift orogenic belt located in south of the Erlian Basin without analyzing their relationships through basement characteristics and tectonic evolutions.Based on geological and geophysical data,a research of the basement evolution process and tectonic evolution of Erlian Basin is carried out with gravity-magnetic-electric features and sequence stratigraphic cycle correlations.The following understandings are obtained:①The basement evolution of the Erlian Basin experienced six stages including oceanic basin development in Caledonian Period(Stage Ⅰ),Mengnan area uplifted during Hercynian Period(Stage Ⅱ),Paleo-Asian ocean-Xing-Meng trough initially developed to finally closed during Hercynian Period(Stage Ⅲ),unified basement formed during early Indosinian Period(Stage Ⅳ),unified basin development during late Indosinian to Yanshanian Period(Stage Ⅴ),and open inland basin development during Himalayan Period(Stage Ⅵ); among which,Ⅱ,Ⅴ,and Ⅵ are key stages; ②The basement of Erlian Basin is characterized by transitional feature,and its north,middle,and south parts were developed respectively in Early Hercynian,Late Hercynian to Indosinian,and Caledonian with distinct features; ③The basement evolution of the Erlian Basin was characterized by unified basement and unified basin,Mengnan area experienced two uplifting periods including Devonian-Permian(Hercynian) and Cenozoic(Himalayan),and formed unified basin during Late Triassic-Cretaceous(Late Indosinian to Yanshanian) on the unified basement uplift; ④The basement characteristics and basin evolution process of Mengnan area and Erlian Basin are similar,which indicates that Mengnan area is a part of Erlian Basin during geological historical period.
张以明, 刘震, 付升, 降栓奇, 姚宁, 王鑫. 二连盆地基底特征及演化新认识[J]. 石油地球物理勘探, 2019, 54(2): 404-416.
ZHANG Yiming, LIU Zhen, FU Sheng, JIANG Shuanqi, YAO Ning, and WANG Xin. New understandings of the basement characteristics and evolution process of Erlian Basin. Oil Geophysical Prospecting, 2019, 54(2): 404-416.
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