摘要
燕山地区冀北坳陷雾迷山组为碳酸盐岩潮坪沉积,进一步分为潮上带、潮下带、潮间带3个亚相和上潮间带、下潮间带、潮下高能带、潮下低能带4个微相。利用因子分析法对微量元素和氧化物的富集规律及其环境意义进行了探讨。研究表明,该区碳酸盐岩受陆源浑水沉积的影响,而且地球化学特征与沉积环境有着极为密切的关系。无论是微量元素还是氧化物,其含量大多数都由潮上带—潮间带—潮下带呈明显增大的趋势。随着水体加深,对碳酸盐岩沉积环境较敏感的Sr,B含量及Sr/Ba,Sr/Ca,Mn/Fe值也由潮上带至潮下带逐渐增大。上述特征不仅表明该区地球化学特征可作为相分析的重要标志,也说明野外地层和沉积相划分的准确度较高。
The Wumishan Formation in Jibei Depression is of carbonate tide-flat sedimentary,and can be divi-ded into three subfacies（supralittoral zone,subtidal zone,intertidal zone） and four microfacies（upper and lower intertidal zones as well as high-energy and low-energy subtidal zones）.An analysis of trace element and oxide enrichment pattern is carried out by using factor analysis method.The result shows that the carbonates in the area are affected by terrigenous muddy water sedimentation and that there is a close relationship between its geochemical behaviors and sedimentary environment.Contents of both trace elements and oxide significantly increase from supralittoral zone to intertidal zone and to subtidal zone.As the water depth increases,the content of Sr and B,which are sensitive to carbonate sedimentary environment,and Sr/Ba,Sr/Ca and Mn/Fe ratios,rise from the supralittoral zone to subtidal zone.These features indicate that the geochemical characteristics of the area can be used as important marks for facies analysis and that the accuracy of field division of stratum and sedimentary facies is relatively high.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2011年第1期17-28,共12页
Oil & Gas Geology
基金
中国石化股份有限公司海相油气勘探前瞻性项目(YPH08025)
关键词
碳酸盐岩
地球化学
因子分析
雾迷山组
冀北坳陷
燕山地区
carbonate rock
geochemical behavior
factor analysis
Wumishan Formation
Jibei Depression
Yanshan region
