| 辽河盆地东部凹陷现今地温场及热历史的研究 |
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| 引用本文： | 王永新,冯殿生,汪集,吴铁生.辽河盆地东部凹陷现今地温场及热历史的研究[J].地球物理学报,2003,46(2):197-202. |
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| 作者姓名： | 王永新 冯殿生 汪集 吴铁生 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所, 北京\ 100029 2 辽河石油管理局勘探开发研究院, 辽宁盘锦\ 124010 |
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| 基金项目： | 国家自然科学基金项目 (40 1 72 1 0 0 ) . |
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| 摘 要： | 依据10口系统测温井数据和61块岩石热导率测试结果，计算了辽河盆地东部凹陷10个 高质量的大地热流数据，并在此基础上，利用镜质体反射率（Ro）资料对该区的热历史 进行了恢复. 结果表明：东部凹陷下第三系平均地温梯度为36.5℃/km，岩石平均热导率为1 .667W/(m·K)，热流密度变化于49.5～70.0mW/m2之间，平均为58.0mW/m2；东部凹陷热 流呈现古热流高现今热流低的变化特征，从沙三期到东营期，古热流值是逐渐增大的，到东 营期末达到最大值，晚第三纪至现今表现为持续冷却；构造沉降史分析显示，盆地经历了早 期的裂谷阶段（43～25Ma）和后期的热沉降阶段. 盆地现今较低的大地热流和较高的古热流 及典型的裂谷型构造沉降样式为东部凹陷的构造-热演化提供了重要认识.
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| 关 键 词： | 辽河盆地 东部凹陷 大地热流 热史恢复 构造-热演化 |
| 文章编号： | 0001-5733(2003)02-0197-06 |
| 收稿时间： | 2002-2-5 |
| 修稿时间： | 2002-11-21 |
PRESENT-DAY GEOTHERMAL FIELD AND THERMAL HISTORY OF EASTERN SUBDEPRESSION, LIAOHE BASIN |
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| WANG YONGXIN.PRESENT-DAY GEOTHERMAL FIELD AND THERMAL HISTORY OF EASTERN SUBDEPRESSION, LIAOHE BASIN[J].Chinese Journal of Geophysics,2003,46(2):197-202. |
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| Authors: | WANG YONGXIN |
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| Institution: | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China 2 Liaohe Oilfield Administrative Bureau, Panjin 124010,China |
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| Abstract: | Based on temperature measurements in 10 boreholes and thermal conducti vity determination of 61 rock samples, 10 heat flow values were obtained for the eastern subdepression of Liaohe basin. The thermal history of eastern subdepres sion was reconstructed based on the vitrinite reflectance (Ro) data. The res ults show that the mean geothermal gradient and thermal conductivity are about 3 6.5 ℃/km and 1.667 W/(m·K) respectively, and the corresponding heat flow range s from 49.5 mW/m2 to 70.0 mW/m2, with a mean of 580 mW/m2. The eastern s ubdepression experienced a much higher heat flow period from 43Ma to 25Ma. After reaching the maximum heat flow of～82 mW/m2 at 25Ma, the subdepression coole d down to the present day heat flow of ～60 mW/m2. Structural subsidence anal ysis shows that the subsidence of eastern subdepression is divided into two phas es: earlier syn rift phase (25～43Ma) and late thermal subsidence phase (since 25Ma).The lower present day heat flow and the higher palaeo heat flow correspo nding to structual subsidence stages as well as the typical rift subsidence styl e provide some insight into the tectonothermal evolution of the basin. |
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| Keywords: | Liaohe basin Eastern subdepression Heat flow Thermal history Tectonothermal evolution |
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