| 中国大陆科学钻探主孔自然放射性测井及其解释 |
| |
| 引用本文： | 骆淼,潘和平,赵永刚,张红杰,周峰.中国大陆科学钻探主孔自然放射性测井及其解释[J].地球科学,2008,33(5). |
| |
| 作者姓名： | 骆淼 潘和平 赵永刚 张红杰 周峰 |
| |
| 作者单位： | 中国地质大学研究生院，中国地质大学地球物理与空间信息学院，中国石化集团华北石油局数字测井站 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 为了认识江苏东海超高压变质带上地壳岩石自然放射性的垂向分布特征,榴辉岩退变质程度对放射性元素浓度的影响,以及放射性产热率对地温梯度的影响,利用中国大陆科学钻探(CCSD)主孔100~5000m自然放射性测井(自然伽马和自然伽马能谱)资料统计了CCSD主孔各类岩石的自然放射性强度和铀、钍、钾元素的浓度,计算出产热率曲线.自然伽马,铀、钍、钾浓度和产热率从蛇纹岩到榴辉岩、角闪岩、副片麻岩、正片麻岩依次增大.随着榴辉岩退变质程度的增强,其铀、钍、钾元素的浓度值逐渐增大.CCSD主孔自然放射性的垂向分布特征主要受岩性控制,自然放射性随深度增加有增强趋势.产热率与自然伽马测井值之间有很好的线性关系,在高放射性岩层的上部,地温梯度会出现较强扰动和低值异常.
|
| 关 键 词： | 中国大陆科学钻探主孔 超高压变质岩 自然放射性测井 产热率 |
Natural Radioactivity Logs and Interpretation from the CCSD Main Hole |
| |
| LUO Miao,PAN He-ping,ZHAO Yong-gang,ZHANG Hong-jie,ZHOU Feng.Natural Radioactivity Logs and Interpretation from the CCSD Main Hole[J].Earth Science-Journal of China University of Geosciences,2008,33(5). |
| |
| Authors: | LUO Miao PAN He-ping ZHAO Yong-gang ZHANG Hong-jie ZHOU Feng |
| |
| Abstract: | In order to understand the vertical distribution of natural radioactivity of the upper crust of the ultra-high pressure (UHP) metamorphic belt in Donghai County, Jiangsu province, as well as the influence of the retrogression intensity of eclogite on the concentration of radioelement, and the influence of radiogenic heat production rate on the geothermal gradient, the natural radioactivity logs (gamma ray and gamma spectrometry logs) from the main hole of the Chinese Continental Scientific Drilling (CCSD) were utilized to obtain the natural gamma intensity and the concentration of U, Th and K of main lithologies and the heat production rate log. The natural gamma intensity and concentration of U, Th and K gradually increase from serpentine to eclogite, amphibolite, paragneiss, and orthogneiss. With the strengthening of the retrogression of eclogite, the concentration of U, Th and K of eclogite increase. This indicates that some exotic fluids with U, Th and K elements join in the retrograde metamorphism. The vertical distribution of the natural gamma intensity and concentration of U, Th and K is dominated mainly by lithology. The natural gamma intensity approximately increases with the depth. The heat production rate and the natural gamma log have a good linear relationship. The formation with high radioactivity could cause disturbance and low anomalies on geothermal gradient on its upper formation. |
| |
| Keywords: | main hole of the Chinese Continental Scientific Drilling ultra-high pressure metamorphic rocks natural radioactivity logging heat production rate |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
