High Resolution ID-TIMS Redefines the Distribution and Age of the Main Mesozoic Lacustrine Hydrocarbon Source Rocks in the Ordos Basin,China  

作　　者：CUI Jingwei ZHU Rukai ZHANG Zhongyi Jahandar RAMEZANI LI Yang 

机构地区：[1]Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China [2]Research Institute of Petroleum Exploration and Development of the Changqing Oil Field,China National Petroleum Corporation,Xi'an 710018,China [3]Department of Earth,Atmospheric and Planetary Sciences,Massachusetts Institute of Technology,77 Massachusetts Avenue,Cambridge,Massachusetts 02139,USA

出　　处：《Acta Geologica Sinica(English Edition)》2023年第2期581-588,共8页地质学报（英文版）

基　　金：supported by the Research Program of the Research Institute of Petroleum Exploration and Development of the Changqing Oilfield(Grant No.J2019168)。

摘　　要：Using high-precision zircon U-Pb ID-TIMS geochronology,tuffs from the Chang 9 shale and the Chang 7 shale were dated.The tuff in the Chang 9 shale is 241.47±0.17 Ma,which falls between the top tuff age of 241.06±0.12 Ma and the bottom tuff age of 241.558±0.093 Ma in the Chang 7 shale.These reveal that the Chang 9 and Chang 7 shales are contemporaneous,belonging to the Ladinian stage of the Middle Triassic.This insight expands the region of the main source rock of Chang 7 to the northeast and will inform the search for the deep Chang 9 shale petroleum system,increasing the scope for exploring the Chang 7 shale system in northern Shaanxi.The research results clarify the relationship between the two sets of shale in the Yanchang Formation and redefine the distribution range of the Chang 7 shale in the Ordos Basin.At the same time,it shows that there is a cross-layer problem in the stratigraphic division of the Yanchang Formation in different regions,the high-precision U-Pb dating technology providing a reference for the fine stratigraphic correlation of other continental basins in the world.

关 键 词：ID-TIMS high precision age redefining distribution Chang 7 shale Chang 9 shale Ordos Basin 

分 类 号：P618.13[天文地球—矿床学]