张超,俞礽安,王善博,程银行,奥琮,滕雪明,冯平,于航,司丹,高雪峰.柴西北缘跃进二号地区晚新生代沉积特征及沉积相演化[J].西北地质,2021,54(3):27-38 ZHANG Chao,YU Rengan,WANG Shanbo,CHENG Yinhang,AO Cong,TENG Xueming,FENG Ping,YU Hang,SI Dan,GAO Xuefeng.Late Cenozoic Sedimentary Characteristics and Sedimentary Facies Evolution in Yuejin 2 Area of Northwest Qaidam[J].Northwestern Geology,2021,54(3):27-38
柴西北缘跃进二号地区晚新生代沉积特征及沉积相演化
Late Cenozoic Sedimentary Characteristics and Sedimentary Facies Evolution in Yuejin 2 Area of Northwest Qaidam
投稿时间:2021-01-12  修订日期:2021-04-20
DOI:10.19751/j.cnki.61-1149/p.2021.03.003
中文关键词:  沉积相;晚新生代;跃进二号;柴西北缘
英文关键词:sedimentary facies;late Cenozoic;Yuejin 2;northwest Qaidam
基金项目:青海省青藏高原北部地质过程与矿产资源重点实验室资助项目“柴达木盆地西北缘新近纪以来古气候演化及其对砂岩型铀矿的控制作用”(2019-KY-02),青海省清洁能源矿产专项资金勘查项目“柴达木盆地中新生代砂岩型铀矿找矿突破与部署研究”(2021074006ky006)及中国地质调查局地质调查项目“鄂尔多斯、柴达木等盆地砂岩型铀矿调查”(DD20190119)资助。
作者单位
张超 中国地质调查局天津地质调查中心, 天津 300170 
俞礽安 中国地质调查局天津地质调查中心, 天津 300170 
王善博 中国地质调查局天津地质调查中心, 天津 300170 
程银行 中国地质调查局天津地质调查中心, 天津 300170 
奥琮 中国地质调查局天津地质调查中心, 天津 300170 
滕雪明 中国地质调查局天津地质调查中心, 天津 300170 
冯平 四川省核工业地质局二八三大队, 四川 达州 635000 
于航 四川省核工业地质局二八三大队, 四川 达州 635000 
司丹 中国石油青海油田分公司, 甘肃 敦煌 736200 
高雪峰 中国石油青海油田分公司, 甘肃 敦煌 736200 
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中文摘要:
      柴西北缘跃进二号地区沉积相特征精细研究对油气及铀矿勘查意义重大。笔者通过收集柴西北缘典型油气矿区200余孔典型钻孔资料,结合区域古地理及构造特征,分析砂体等厚度图,绘制柴西北缘晚新生代上油砂山组、狮子沟组及七个泉组沉积相平面图,揭示柴西北缘在晚新生代主要发育辫状河三角洲前缘、扇三角洲平原、辫状河三角洲平原、滩坝、扇三角洲前缘、洪泛-泛滥平原及滨浅湖等沉积亚相及沉积相。通过对跃进二号地区ZK8-20、跃Ⅱ5-21、ZKⅡ1-10、跃Ⅱ4-11下、跃Ⅱ2-6等钻孔不同地层岩性、颜色、沉积序列、测井曲线、沉积结构构造等的综合分析,根据沉积学原理,认为该区在上油砂山组及狮子沟组主要发育辫状河三角洲平原,表现为水上分流河道及分流河道间沉积特征;第四系七个泉组主要发育辫状河三角洲前缘沉积相,表现为河口坝沉积微相、分流间湾微相及水下分流河道微相等。识别出研究区在晚新生代沉积相主要表现为退积式分布特征,湖水平面在狮子沟组有轻微下降,在七个泉组上升;研究区垂向上从下向上发育辫状河三角洲前缘亚相、辫状河三角洲平原亚相、滨浅湖亚相,形成了上部湖相,下部辫状河三角洲相的沉积模式。
英文摘要:
      The detailed study of the sedimentary facies in Yuejin 2 area of northwest Qaidam is of great significance to the exploration of oil, gas and uranium deposits. On the basis of the data from more than 200 typical boreholes in northwest Qaidam,the regional palaeogeography and tectonic features,and the iso thickness map of the sand body,the authors have drawn the plane maps of sedimentary facies for upper Youshashan Formation, Shizigou Formation and Qigequan Formation in this area, revealing that braided river delta front, fan delta plain, braided river delta plain, beach bar,fan delta front,flood-flood plain,and shore shallow lake developed in the late Cenozoic in northwest Qaidam.Through comprehensive analysis of lithology,color,sedimentary sequence, logging curve, and the sedimentary structure of ZK8-20, ZKII5-21, ZKII1-10, Yuejin II4-11, Yuejin II2-6 and other boreholes in Yuejin 2 area, it is considered that braided river delta plain mainly developed in upper Youshashan Formation and Shizigou Formation of this area,showing the sedimentary characteristics of distributary channel above water and among distributary channels.The Qigequan Formation is mainly developed the differentiation river delta front, characterized by underwater distributary channel, distributary bay and mouth bar.The late Cenozoic sedimentary facies are mainly characterized by regressive distribution in the study area. The lake level slightly decreased in Shizigou Formation and rose in Qigequan Formation. Littoral-shallow lake subfacies, discerned river delta plain subfacies and discerned river delta front subfacies developed vertically from top to bottom, forming the sedimentary model of upper lacustrine facies and lower discerned river delta facies.
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