热带海洋学报 ›› 2011, Vol. 30 ›› Issue (6): 74-83.doi: 10.11978/j.issn.1009-5470.2011.06.074cstr: 32234.14.j.issn.1009-5470.2011.06.074

• 海洋地质学 • 上一篇    下一篇

琼东南盆地古近纪基底断裂的活动特征分析 *

李亚敏 1, 2 , 施小斌 1 , 徐辉龙 1 , 刘兵 3   

  1. 1. 中国科学院边缘海地质 重 点实验室 , 中国科学院南海海洋研究所 , 广东 广州 510301; 2. 中国科学院研究生院 , 北京 100049; 3. 中海石油 中国 有限公司湛江分公司 , 广东 湛江 524057
  • 收稿日期:2010-02-09 修回日期:2010-03-26 出版日期:2011-12-20 发布日期:2011-12-22
  • 作者简介: 李亚敏 (1979—), 女 , 安徽省萧县人 , 博士研究生 , 主要从事盆地分析。
  • 基金资助:
    国家自然科学 (40676041); 国家重点基础研究发展计划项目 (2007CB41170104 、 2007 CB41170401)

Analysis on the characteristics of Paleogene basement faults’ activity in Qiongdongnan Basin

LI Ya-min1, 2, SHI Xiao-bin1, XU Hui-long1, LIU Bing3   

  1. 1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China ; 2. Graduate University of CAS , Beijing 100049, China ; 3. The Zhanjiang Branch Company of China National offshore Oil China Corporation Limited, Zhanjiang 524057, China
  • Received:2010-02-09 Revised:2010-03-26 Online:2011-12-20 Published:2011-12-22

摘要: 为优化油气盆地内断裂活动强度的研究方法, 分析了断层生长指数、断层落差和断层活动速率等定量研究断裂活动强度的常用参数, 提出了根据断裂两侧的构造沉降差异计算断裂的垂直断距和垂直活动速率的新方法。然后应用这种方法研究琼东南盆地古近纪基底断裂的活动特征。研究表明, 琼东南盆地古近纪基底断裂的活动分为3个阶段: 第一阶段(40—36MaBP), 琼东南盆地东部NE向断裂发生强烈活动, 垂直断距800m左右, 垂直活动速率约200m·Ma-1; 第二阶段(36—30MaBP), 盆地东部NE向断裂活动减弱, 盆地西部E-W向断裂开始活动, 两者垂直断距约400—800m, 垂直活动速率70—130m·Ma-1; 第三阶段(30—21MaBP), 盆地内部断裂活动再次增强, 垂直断距700—1800m, 垂直活动速率80—200m·Ma-1, 而边界断裂活动较弱, 垂直断距约500m, 垂直活动速率不足60m·Ma-1

关键词: 断裂活动强度, 构造沉降, 断层垂直活动速率, 断层垂直断距, 琼东南盆地

Abstract: To optimize a research method to be used for fault activity intensity in petroleum basins, this study analyzed commonly used parameters to study fault activity intensity, including fault growth index, fault throw, and the rate of fault activity. Then, the new approach was used to calculate the fault throw and the vertical rate of fault activity by the differential tectonic subsidence on both sides of the fault. The characteristics of the Paleogene basement faults’ activity in the Qiongdongnan Basin were studied using the new approach. The results show that the activity of the Paleogene basement faults in the Qiongdongnan Basin can be divided into three phases. In the first phase (from 40 to 36MaBP), the NE tending faults in the eastern Qiongdongnan Basin were strongly active with the fault throw of 800 m and the vertical rate of 200 m · Ma - 1 . In the second phase (from 36 to 30MaBP), the activity of the faults’ trenching in the NE of the eastern Qiongdongnan Basin became weaker, while the faults’ trending in the NW of the western Qiongdongnan Basin became active. The activity intensity of the two different trending faults is similar with the fault throw ranging from 400 - 800m and the vertical rate from 70 to 130 m · Ma - 1 . In the third phase (from 30 to 21MaBP), interior faults of the Qiongdongnan Basin acted more strongly again with the fault throw from 700 - 1800 m and the vertical rate from 80 to 200 m · Ma - 1 , while the boundary faults acted more weakly with the fault throw of 500m and the vertical rate lower than 60 m · Ma - 1 .

Key words: fault activity intensity;tectonic subsidence, vertical rate of fault activity;fault throw, Qiongdongnan Basin

中图分类号: 

  • P736.1