摘要
井中地层层序的建立和时代确定,是岩石地层单位划分与对比的关键证据,对正确确立储层意义重大。新疆克拉玛依油田424井上部2140~3178 m井段以海相陆源碎屑岩为主,在井深3176.94~3178.44 m深灰色粉砂岩与灰黑色细砂岩互层中获得了匙叶粉Noeggerathiops−idozonotriletes等孢粉化石,指示其时代属晚石炭世早—中期(Bashkirian−Moscovian)的可能性最大;下部井段3178~3551.63 m以火山角砾岩间夹熔岩为主,在3340.50~3343.50 m杏仁状玄武安山岩获得306 Ma的LA−ICP−MS锆石U−Pb年龄;确认上部陆源碎屑岩与下部火山角砾岩二者为整合接触,二分性特征明显。据此,确认上部层位与424井之北哈拉阿拉特山区阿腊德依克赛组建组剖面下段总体可对比;下部层位与424井之北哈拉阿拉特组上部层位可对比。这一成果细分了424井中岩石地层单位,弥补了这2组在山区原建组剖面“原始接触关系不清,新老关系不明”之不足。
The establishment and age determination of the stratigraphic sequence in the well is the key evidence for the division and correlation of rock stratigraphic units.This is significant for the correct establishment of the reservoir.The upper section of well 424(2140~3178 m)in Karamay Oilfield is dominated by marine terrestrial clastic rocks.Sporopollen fossils,such as Noeggerathiops−idozonotriletes were obtained in the in-terbedded dark gray siltstone and gray−black fine sandstone in the depth of 3176.94~3178.44 m,indicating that they formed in early to middle stage of Late Carboniferous(Bashkirian−Moscovian);The lower section 3178~3551.63 m is mainly composed of volcanic breccia and intercalated lava.LA−ICP−MS zircon U−Pb age of 306 Ma was obtained from the amygdaloidal basaltic andesite at 3340.50~3343.50 m.It is considered that the upper terrestrial clastic rocks and the lower volcanic breccia are integrated contact and show obvious di-chotomy characteristics.Accordingly,it is confirmed that the upper part(2140~3178 m)of the well 424 is comparable to the lower part of the stratotype section of the Aladeyikesai Formation in the Hala’alate Mountain,and the lower part(3178~3551.63 m)is comparable to the upper part of the Hala’alate Formation.This result not only subdivides lithostratigraphic unit of Well 424,but also makes up the deficiency of the unclear original stratigraphic contact relationship and old−new relationship between the stratotype sections of Aladeyikesai and Hala’alate formations in the mountain area.
作者
蒋志斌
黄家瑄
李永军
李思远
王韬
王杰
彭南赫
JIANG Zhibin;HUANG Jiaxuan;LI Yongjun;LI Siyuan;WANG Tao;WANG Jie;PENG Nanhe(Exploration and Development Institute,Xinjiang Oilfield Company,Petro China,Karamay 834000,Xinjiang,China;School of Earth Science and Resources,Chang'an University,Xi’an 710054,Shaanxi,China)
出处
《西北地质》
CAS
CSCD
北大核心
2023年第2期1-9,共9页
Northwestern Geology
基金
国家重点研发计划“深地资源勘查开采重点专项”(2018YFC060400)
中国石油天然气股份有限公司科学研究与技术开发项目“北疆海相泥盆系—石炭系油气地质研究”(2022DJ0507)联合资助。
