摘要
应用热释光技术对南海东部海域(13.00°～22.00°N、117.00°～119°30'E)42个站位的表层沉积物样品进行分析测量,结合气烃组合指标C1/(C2+C3)及甲烷碳同位素判别地表气烃的成因类型,并有效指示了海底深部油气藏散失引起的放射性异常,研究还发现热释光在不同沉积粒径中的测试剂量不同,结果为黏土质粉砂大于砂质粉砂;热释光也与部分化学元素含量有关,与稀土金属Nb、金属元素Zr呈显著正相关,与微量元素S、Ba呈负相关;天然热释光还与不同区块的沉积物酸解气烃甲烷、丙烷、异丁烷呈强烈正相关.数理统计分析结果表明沉积物的热释光和气烃的异常值完全吻合.
The survey area （ 13.00°- 22.00°N, 117.00°- 119°30′W） is located in the eastern area of the South China Sea. Thermoluminescence （TL） technique has been used to analyze 42 samples of the surface sediments. It is effective to indicate the abnormity of radioactivity from deep oil and gas accumulation. The C1/（ C2＋C3）and methane carbon isotope is used to determine anomaly hydrocarbon gas sources. The resuits prove that TL is closely related to sediment grain sizes and composition. Some thulium and metallic elements, such as Nb and Zr, have positive correlation with TL,and S and Ba have negative correlation with TL. TL appears to have strong positive correlation with gaseous hydrocarbon such as CH4 ,C3H8 and i-C4 H10 in surface sediments from different areas. It has been proved that natural TL can be a useful index for petroleum exploration. The result of statistical analysis shows that the anomaly of thermoluminescence co-incides well with methane anomaly.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2005年第3期103-112,共10页
Marine Geology & Quaternary Geology
基金
国家重点基础研究发展规划项目(G2000078500)
国家专项(DY105-01-01-5)
关键词
热释光
气烃
甲烷
化学元素
异常值
南海东部
thermoluminescence
hydrocarbon gases
chemical elements
anomaly
east of the South China Sea
