天津城区JNR-16地热孔本溪组-太原组岩石地层剖面

摘要

After studying on the pollen and strata of Carboniferous system from geotherm hole JNR-16 in urban area of Tianjin, we found that the strata of the Carboniferous Benxi Formation and Taiyuan Formation are devel-oped completely. The pollen zone can be compared with that in Shanxi and Tangshan areas. The thickness of pol-len zone in Benxi Formation and Taiyuan Formation are respectively 33.5 m and 41.1 m. In addition, six sea in-cursion system domain parasequences in Taiyuan Formation are found. Every parasequence has limestone devel-oped in it. The limestone strata can be compared with which of Taiyuan Formation in Tangshan area. All of these have guiding significances to geological work of bedrock buried area in Tianjin. In this paper, we suggest that Carboniferous subsequence reference section of well JNR-16 in Tianjin should be established.%通过对天津城区JNR-16孔石炭纪孢粉及其岩石地层研究，发现本孔揭露的石炭-二叠系本溪组、太原组发育完整，其中的孢粉带可与山西、唐山等地孢粉带对比；本溪组、太原组厚度分别为33.5 m、41.1 m。在太原组中发现6个海侵体系域的准层序，每个准层序中均发育有灰岩，灰岩层可与唐山地区太原组灰岩层相对比。这些资料对天津基岩深埋区地质工作有借鉴意义，建议以该孔为基础建立天津城区石炭系次层型参考剖面。