北黄海盆地东部前中生界基底特征

现代地质 ›› 2005, Vol. 19 ›› Issue (2): 261-266.

北黄海盆地东部前中生界基底特征

肖国林^1,2，孙长虹³，郑浚茂¹

1中国地质大学能源学院，北京100083；
2青岛海洋地质研究所，山东青岛266071;
3中国地质大学地球物理与信息技术学院，北京100083

收稿日期:2004-09-15 修回日期:2004-12-20 出版日期:2005-02-20 发布日期:2005-02-20
作者简介:肖国林，男，研究员，博士研究生，1962年出生，矿产普查与勘探专业，主要从事中国海域油气地质方面的研究工作。
基金资助:
北黄海盆地基底地质结构及形成演化研究（XM（2002）-27A）

Pre-Mesozoic Basement Characteristics in the Eastern Depression of the North Yellow Sea Basin

XIAO Guo-lin^1,2，SUN Chang-hong³，ZHENG Jun-mao¹

1 School of Energy Resources, China University of Geosciences, Beijing 100083, China;
2 Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China;
3School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China

Received:2004-09-15 Revised:2004-12-20 Online:2005-02-20 Published:2005-02-20

摘要/Abstract

摘要：

北黄海盆地是中国近海唯一未获得油气突破及勘探程度最低的含油气盆地（朝鲜已在该盆地东部实现了工业性油气突破），朝鲜在东部凹陷的3口钻井证实北黄海盆地东部凹陷主体前中生界基底是下古生界(Pz₁)地层，与上覆以砂泥岩为主的中—新生界地层在地球物理特征上有很大差异，该特征提供了以地球物理资料推断和确定中—新生界盆地基底特征的可靠性。通过重力、磁力及大量多道地震资料解释认为，北黄海盆地前中生界基底最大埋深约5.5 km，凹陷主体部位前中生界基底以下古生界碳酸盐岩为主，其东北角可能存在上古生界碎屑岩基底，而凹陷南部可能是元古界浅变质岩基底。

关键词: 前中生界基底, 地球物理特征, 北黄海盆地东部

Abstract:

The North Yellow Sea Basin is the only one offshore petroliferous basin of China that is very lowly explored and where we have not made breakthroughs in oil and gas. However, Korea has discovered commercial hydrocarbon in the east of the basin.Three boreholes of Korea in the eastern depression give evidences that lower Paleozoic strata (Pz₁) act as the pre-Mesozoic basement of the main body of the eastern depression and differ greatly in geophysical properties from the overlying Mesozoic-Cenozoic strata dominated by sandstone and mudstone. These geophysical data can be reliably used to infer and determine the characteristics of the Mesozoic-Cenozoic basin basement. Based upon the interpretations of gravitational, magnetic and multichannel seismic data, there is an evidence that the maximum buried depth of the pre-Mesozoic basement is about 5.5 km in the North Yellow Sea Basin. If taking the previous buried depth of 1 km as the boundary of the basement, the eastern depression has an area of about 1,700 km².Pre-Mesozoic basement of the depression mainly consists of carbonate rock of Lower Paleozoic, in the northeast corner of the depression may exist Late Paleozoic basement made up of clastic rock, and there may be Proterozoic basement of epimetamorphic rock in the south of the depression.

Key words: pre-Mesozoic basement, geophysical property, east of the North Yellow Sea Basin

中图分类号:

肖国林，孙长虹，郑浚茂　. 北黄海盆地东部前中生界基底特征[J]. 现代地质, 2005, 19(2): 261-266.

XIAO Guo-lin，SUN Chang-hong，ZHENG Jun-mao. Pre-Mesozoic Basement Characteristics in the Eastern Depression of the North Yellow Sea Basin[J]. Geoscience, 2005, 19(2): 261-266.

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