苏干湖地区与柴北缘侏罗系原始沉积关系探讨
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摘要
苏干湖地区位于柴达木盆地西北端,二者之间以大、小赛什腾山相隔。钻井及露头资料证实,苏干湖地区和柴北缘新生界之下均有较大范围的侏罗系分布,但围绕两地侏罗系之间的沉积关系探讨较少。本文通过地层与沉积学对比、后期改造分析、物源分析等综合研究认为,苏干湖—柴北缘地区侏罗系经历了白垩纪晚期、新生代末等多期改造作用,现今残留地层分布为后期改造的结果。早侏罗世沉积较局限,柴北缘与苏干湖地区应为相互分隔的沉积区,且以断陷沉积为主。中侏罗世时期,苏干湖地区与柴北缘呈连通状态,赛什腾山地区主体接受沉积,研究区为一个较现今侏罗系残留范围更为广阔的坳陷型沉积盆地。研究结果对于加深理解青藏高原北缘中—新生代构造演化和该地区油气资源评价、勘探部署具较为重要的意义。
Objectives: Suganhu area is located to the north side of Qaidam Basin,two areas separated by Saishiteng Mountain and Xiaosaishiteng Mountain.Drilling and outcrop data confirmed that the Jurassic below the Cenozoic of Suganhu area and Northern Qaidam Basin has a large distribution area,but the study on the Jurassic original sedimentary relationship between two areas is insufficient.Methods: In this paper,a comprehensive study based on the comparative analysis of stratigraphy and sedimentology,characteristics of later stage reconstruction and provenance analysis.Results: The study shows that the Jurassic in Suganhu area and Northern Qaidam Basin is comparable in lithology and sedimentary characteristics.In addition,these strata had been modified after Jurassic period,and the initial uplift of Saishiteng Mountain was in late Cretaceous,forming the distribution of residual Jurassic now.Conclusions: The sedimentary scop in Suganhu area was small during the early Jurassic,therefore,the sedimentary depression of Northern Qaidam and Suganhu area should be independent,and the study area is dominated by the faulted basin.In the Middle Jurassic period,Suganhu area and Northern Qaidam Basin were connected,Saishiteng area was deposited simultaneously,the whole study area was a depression type sedimentary basin of which the sedimentary scop was wider than the distribution of residual Jurassic now.The research results are of great significance for understanding Mesozoic—Cenozoic tectonic evolution and hydrocarbon resource evaluation and exploration deployment in the northern margin of Tibetan Plateau.
Objectives: Suganhu area is located to the north side of Qaidam Basin,two areas separated by Saishiteng Mountain and Xiaosaishiteng Mountain.Drilling and outcrop data confirmed that the Jurassic below the Cenozoic of Suganhu area and Northern Qaidam Basin has a large distribution area,but the study on the Jurassic original sedimentary relationship between two areas is insufficient.Methods: In this paper,a comprehensive study based on the comparative analysis of stratigraphy and sedimentology,characteristics of later stage reconstruction and provenance analysis.Results: The study shows that the Jurassic in Suganhu area and Northern Qaidam Basin is comparable in lithology and sedimentary characteristics.In addition,these strata had been modified after Jurassic period,and the initial uplift of Saishiteng Mountain was in late Cretaceous,forming the distribution of residual Jurassic now.Conclusions: The sedimentary scop in Suganhu area was small during the early Jurassic,therefore,the sedimentary depression of Northern Qaidam and Suganhu area should be independent,and the study area is dominated by the faulted basin.In the Middle Jurassic period,Suganhu area and Northern Qaidam Basin were connected,Saishiteng area was deposited simultaneously,the whole study area was a depression type sedimentary basin of which the sedimentary scop was wider than the distribution of residual Jurassic now.The research results are of great significance for understanding Mesozoic—Cenozoic tectonic evolution and hydrocarbon resource evaluation and exploration deployment in the northern margin of Tibetan Plateau.
引文
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