煤田地质与勘探2019，Vol.47Issue(1)：40-48,9.DOI:10.3969/j.issn.1001-1986.2019.01.006
利用露头、井震及地球化学综合厘定层序界面——以鄂尔多斯盆地东北缘侏罗系为例
Integrated identification of sequence boundary through outcrop, seismic with logging and geochemistry:A case of Jurassic in northeastern margin of Ordos basin
摘要
Abstract
Jurassic strata is mainly rock series containing coal and uranium in Ordos basin. The recognition of Jurassic sequence interfaces were mainly relied on the field outcrop, logging lithology of unconformity surface or the sedimentary discontinuity. However, it is tend to experience human recognition of randomness in the sequence interfaces recognition without macroscopic characteristics. Therefore, based on routine identification work such as outcrop profile and electrical curve of nearly 1 000 boreholes, combined with vertical changes of two-dimensional seismic profile and chemical index of alteration (CIA), three long-term cycle sequence interfaces (TSB1-TSB3) and seven medium-term cycle sequence interfaces (SB1-SB7) were finally identified in Jurassic period. The vertical change of CIA generally reflects that the paleoclimate experienced a transition process from warm-humid (dry-wet) alternation to drought-semi-drought from Yan'an to Zhiluo period, which can be used to identify the interfaces.Comprehensive identification of sequence interfaces can not only improve the accuracy, but also endow key sequence interfaces with paleo sedimentary environment attributes, and reduces the impact of human experience influence. Thus provide reliable basis for the division and correlation of Jurassic sequence strata in the whole basin.关键词
鄂尔多斯盆地东北缘/延安组/直罗组/层序界面/化学蚀变指数 (CIA)Key words
northeastern margin of Ordos basin/Yan&apos/an Formation/Zhiluo Formation/sequence boundary surfaces/chemical index of alteration (CIA)分类
天文与地球科学引用本文复制引用
张天福,张云,程银行,苗培森,奥琮,金若时,段连峰,段霄龙..利用露头、井震及地球化学综合厘定层序界面——以鄂尔多斯盆地东北缘侏罗系为例[J].煤田地质与勘探,2019,47(1):40-48,9.基金项目
国家重点研发计划项目(2018YFC0604200) （2018YFC0604200）
国家重点基础研究发展计划(973计划)项目(2015CB4530006) （973计划）
中国地质调查局地质调查项目(DD20160127) （DD20160127）
