柴达木盆地北缘冷湖构造带通1井沉凝灰岩的形成时代及其地质意义  

Formation Age of Tuffites from the Well Tong 1 in the Lenghu Structural Belt at the Northern Margin of Qaidam Basin,and Its Geological Significance

作　　者：吴志雄 王海杰 任云飞[2] 李雅楠 朱小辉[2] 游仁宗 陈丹玲[2] WU Zhixiong;WANG Haijie;REN Yunfei;LI Ya’nan;ZHU Xiaohui;YOU Renzong;CHEN Danling(Exploration and Development Institute of Qinghai Oilfield Company,Petro-China/Plateau Saline Lacustrine Basin Oil-Gas Geology Key Laboratory of Qinghai Province,Dunhuang 736202,Gansu,China;State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,Shaanxi,China)

机构地区：[1]中国石油青海油田勘探开发研究院,青海省高原咸化湖盆油气地质重点实验室,甘肃敦煌736202 [2]西北大学地质学系,大陆动力学国家重点实验室,陕西西安710069

出　　处：《大地构造与成矿学》2024年第6期1468-1479,I0039,I0040,共14页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(41802056、41972058);中石油青海油田公司柴达木盆地基岩成岩成储规律研究项目(研2020-勘探-技术-09);柴达木盆地山前冲断带成藏规律及勘探方向研究项目(2021DJ0305)联合资助。

摘　　要：柴达木盆地北缘(柴北缘)冷湖构造带的通1井在4607 m侏罗系之下,钻遇一套富含火山物质的岩层。为准确判定其成因类型和形成时代,本文在系统的岩心和岩屑观察鉴定、地球物理测井和X衍射分析的基础上,结合锆石成因矿物学和年代学研究结果以及区域构造演化特征,认为该套地层为一套含玄武质角砾沉凝灰岩、中酸性沉凝灰岩和凝灰质砂岩的岩石组合,沉积时代介于201~275 Ma之间,很可能形成于中-晚二叠世。这一研究结果不仅揭示柴达木盆地沉积覆盖区可能存在二叠系这一重要信息,而且还为盆地内石油天然气的进一步勘探开发拓展了新的空间。In the Lenghu tectonic belt along the northern margin of the Qaidam Basin,a sequence of volcanic-material rich strata was encountered in the Tong 1 well at a depth of 4607 m beneath the Jurassic.On the basis of systematic macro-and micro-observation of the drill cores,geophysical logging,and X-ray diffraction analysis,zircon U-Pb dating,combined with the regional tectonic evolution,we suggest that the strata consisted of basaltic breccia tuffite,intermediateacid tuffite,and tuffaceous sandstone,which were deposited at 201-275 Ma in the middle-late Permian.These results demonstrate the existence of Permian strata in the coverage area of the Qaidam Basin and thus expanded the potential for further oil and gas exploration and development.

关 键 词：沉凝灰岩 锆石U-PB定年 二叠系 冷湖构造带 柴达木盆地 

分 类 号：P597[天文地球—地球化学]