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渤海盆地热历史及构造-热演化特征
引用本文:胡圣标,张容燕,罗毓晖,蔡东升.渤海盆地热历史及构造-热演化特征[J].地球物理学报,1999,42(6):748-755.
作者姓名:胡圣标  张容燕  罗毓晖  蔡东升
作者单位:1. 中国科学院地质与地球物理研究所 北京 100029; 2. 渤海石油公司研究院 天津 300452
基金项目:国家自然科学基金!49672169,中国海洋石油总公司“九五”科技攻关项目!9605-3
摘    要:渤海盆地大地热流测量和利用磷灰石裂变径迹及镜质体反射率数据进行的盆地热史恢复结果表明:盆地现今热流值为50-75mW/m2,背景热流值达63.6mW/m2,而早第三纪砂河街组和东营组沉积时(25-50Ma)盆地古热流值为70-90mW/m2.盆地构造沉降史分析显示,盆地(含辽东湾地区和渤海地区)经历了早期的裂谷阶段(25一扣Ma)和后期的热沉降阶段(25-0Ma),其中早期的裂谷阶段包含了两个裂谷亚旋回.渤海盆地内的后期热沉降叠加了12Ma以来由高密度地幔及岩石圈冷却诱发的快速均衡沉降.渤海盆地现今较低的大地热流值和较高的古热流及典型的裂谷型构造沉降样式等支持了渤海盆地板内裂谷盆地的大地构造属性并为渤海盆地构造一热演化提供了重要认识.

关 键 词:渤海盆地  热流  热史恢复  构造沉降  构造一热演化  
收稿时间:1999-05-20
修稿时间:1999年5月20日

THERMAL HISTORY AND TECTONIC-THERMAL EVOLUTION OF BOHAI BASIN, EAST CHINA
HU SHENG-BIAO, ZHANG RONG-YAN.THERMAL HISTORY AND TECTONIC-THERMAL EVOLUTION OF BOHAI BASIN, EAST CHINA[J].Chinese Journal of Geophysics,1999,42(6):748-755.
Authors:HU SHENG-BIAO  ZHANG RONG-YAN
Affiliation:1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Research Institute, Bohai Oil Corporation, Tianjing 300452, China
Abstract:Heat flow measurements and thermal history reconstruction from inversion ofapatite and vitrinite reflectance data, indicate that Bohai Basin is characterized bylower present-day heat flow varying between 50 and 75mW / m2 with a backgroundheat flow value of 63.6mW / m2, and that the basin experienced a much higher heatflow (70-90mW / m2) Period prior to about 25Ma. Structural subsidence analysisshows that the subsidence of Bohai Basin, consisted of East Liao Bay and Bohai areas,can be divided into two phases : earlier(25-50Ma) initial (rift) and later (since 25Ma)thermal subsidence. The earlier rift Phase is composed of two sub-rift episodes withquick subsidence, and the later thermal subsidence was superimposed with rapidsubsidence related to crustal isostasy induced by higher density mantle and cooling ofthe lithosphere. The lower present-day heat flow and the higher palaeo-heat flowcorresponding to structural subsidence stage as well as the typical rift subsidence style in Bohai Basin support its feature of intraplate, rift basin, and provided with someinsight to the tectonic-thermal evolution of the basin.
Keywords:Bohai Basin  Heat flow  Thermal history reconstruction  Structuralsubsidence  Tectonothermal evolution  
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