利用热声发射技术测量岩石最高古温度的探索  

Study on measuring the highest rock paleotemperature with thermo-acoustic emission

作　　者：李佳蔚[1] 邱楠生[1] 梅庆华[1] 丁洁[1] 秦建中[2] 郑伦举[2] 

机构地区：[1]中国石油大学(北京)盆地与油藏研究中心,北京102249 [2]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151

出　　处：《地球物理学报》2011年第11期2898-2905,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41072103);国家重点基础研究计划(973项目)(2005CB422102);中石化海相前瞻性项目(YPH08057)资助

摘　　要：根据岩石的热Kaiser效应,岩石能够记忆地质历史中经历过的最高温度.本次实验使用自行研制的岩石热声发射仪,利用人工加热的砂岩和灰岩样品证实了沉积岩存在热Kaiser效应,并探讨了根据热Kaiser效应测量沉积岩经历的最高温度的准确性.通过对塔里术盆地的系列埋深(2800～5300 m)的砂岩和泥岩样品及川西地区灰岩样品的研究,结果显示样品的声发射信号随温度升高变化显著,热Kaiser效应明显;利用热声发射技术测得的温度与岩石经历的最高温度基本一致,表明该方法可用于岩石经历的最高温度测定.因此,热声发射技术可以为沉积盆地热史恢复提供一种新的途径.The thermal Kaiser effect suggests that rock can record the information of the highest temperature that it has experienced in the geologic history. Using self-developed thermo-acoustic emission instruments, the highest rock paleotemperature was measured in this study. Tests on artificial heated sandstone and limestone samples verify the existence of thermal Kaiser effect for sedimentary rocks and the accuracy of the experiment results. And the highest temperatures of sandstone and mudstone samples with different buried depths in the Tarim basin and a sample in Western Sichuan were carefully measured. The results illustrate good thermal Kaiser effect and the rock thermo-acoustic emission signals vary with temperature. Temperatures measured by thermo-acoustic emission are largely consistent with the highest temperatures samples experienced, suggesting the thermo-acoustic emission can be applied to paleogeotemperature measurement. Therefore, thermo-acoustic emission technique can be considered as a new method in thermal history reconstruction of sedimentary basins.

关 键 词：岩石热声发射 热Kaiser效应 最高温度 沉积岩 

分 类 号：P318[天文地球—固体地球物理学]