松辽盆地徐家围子断陷营城组火山地层期次划分及分布规律  

Division of volcanic eruption stages and distribution patterns of volcanic rocks in Yingcheng Formation of Xujiaweizi fault depression,Songliao Basin

作　　者：魏翔宇[1,2] 赵延朋 王璞珺 魏琴[3] 陈晓锋 印长海 高有峰[1] WEI Xiangyu;ZHAO Yanpeng;WANG Pujun;WEI Qin;CHEN Xiaofeng;YIN Changhai;GAO Youfeng(College of Earth Sciences,Jilin University,Changchun 130061,China;China Nonferrous Metals(Guilin)Geology and Mining Company Limited,Guilin 541004,China;No.1 Middle School in Nanping,Nanping 353000,China;Institute of Exploration and Development of Daqing Oilfield Company Limited,Daqing 163712,China)

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]中国有色桂林矿产地质研究院有限公司,广西桂林541004 [3]福建省南平第一中学,福建南平353000 [4]中国石油大庆油田公司勘探开发研究院,黑龙江大庆163712

出　　处：《中国石油大学学报（自然科学版）》2023年第4期12-23,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发项目(2019YFC0605402);国家自然科学基金重大项目(41790453);中国地质调查局油气基础性公益性地质调查项目(DD20160207-06)。

摘　　要：基于大量钻井岩心、薄片、测井、同位素年龄和三维地震等资料,以营二段含煤火山碎屑沉积夹层为标准层,通过测井曲线识别火山地层界面,结合ECS测井中获取的Gd、Ti元素识别该火山地层界面的类型,建立松辽盆地北部徐家围子断陷营城组“三段六期次”火山地层序列。在此基础上,总结火山喷发期次界面特征,探讨营城组火山岩分布与深大断裂的关系。结果表明:营一段3个期次自下而上岩性分别为“中基性熔岩/砂砾岩→酸性(碎屑)熔岩/火山碎屑岩→酸性熔岩/火山碎屑岩”;营三段3个期次自下而上岩性分别为“酸性熔岩→中基性熔岩→酸性酸性(碎屑)熔岩/火山碎屑岩偶夹中基性熔岩”;期次间界面主要是风化壳、岩性界面和再搬运堆积物夹层;期次内地层界面通常是同岩性的小型风化壳,风化蚀变带和火山碎屑夹层;徐东地区T_(4-1)和T_(4)界面之间发育两套产状明显不同的火山岩是营一段不同期次火山喷发产物;营一段主要分布在徐东、徐西和升平-宋站地区,安达地区不发育;从早期到晚期火山喷发中心从南向北迁移,依次受徐中断裂→徐中断裂和徐东断裂南部→徐东断裂南部控制;营三段主要分布在安达、升平-宋站和徐西地区,徐东地区不发育;营三段火山岩在断陷北部从早期到晚期依次受徐西断裂→徐西断裂和徐东断裂→徐西断裂和徐东断裂控制;断陷南部火山岩主要受徐中断裂和徐西断裂共同控制。Based on extensive analysis of drilling cores,thin sections,well logs,isotopic ages and 3D seismic data,the second member of the Yingcheng Formation,characterized by the presence of coal-bearing pyroclastic sedimentary interlayers,serves as a reference for redividing the volcanic stratigraphic sequence of the Yingcheng Formation.The volcanic stratigraphic interfacesare identified using logging curves andthe enrichment of Gd and Ti elements obtained from ECS logging.The study establishes the"three sections and six phases"volcanic stratigraphic sequence of the Yingcheng Formation in the Xujiaweizi fault depression.Building upon the above work,this research summarizes the characteristics of volcanic eruption interfacesand discusses the relationship between the distribution of volcanic rocks in the Yingcheng Formation and deep faults.The research findings reveal that:the lithology of the three stages of the 1st member of Yingcheng Formation can be classified from bottom to top as"medium basic lava/glutenite→acid(clastic)lava/volcanic clastic rock→acid lava/volcanic clastic rock."Similarly,the lithology of the 3rd member of Yingcheng Formation consists of"acidic lava→intermediate basic lava→acidic acidic(clastic)lava/volcaniclastic rock with intermediate basic lava".The inter-stage interfacesprimarily include weathering crusts,lithologic interfaces,and interlayers of re-transported deposits.The interfaces within each stage are usually small weathering crusts,weathering alteration zones,and volcaniclastic interlayersof the same lithology.The development of two sets of volcanic rocks with different occurrences between the T_(4-1) interface and the T_(4) interface in Xudong area is indicative of different stages within the first member of Yingcheng Formation.Specifically,volcanic rocks of the 1st member of Yingcheng Formation are predominantly distributed in Xudong,Xuxi and Shengping-Songzhan areas,while Anda area eexhibits limited volcanic activity.The volcanic eruption centers shiftfrom south to north in the Xu

关 键 词：松辽盆地北部徐家围子断陷 下白垩统营城组 元素俘获谱测井 火山地层 期次划分 

分 类 号：P588.14[天文地球—岩石学] P618.13[天文地球—地质学]