| 基于微量元素比值分析方法研究川东南地区小河坝组沉积环境和古气候环境 |
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| 引用本文： | 杨海欧,王长城,李文杰,董华,龚晓星. 基于微量元素比值分析方法研究川东南地区小河坝组沉积环境和古气候环境[J]. 岩矿测试, 2017, 36(3): 289-296 |
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| 作者姓名： | 杨海欧 王长城 李文杰 董华 龚晓星 |
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| 作者单位： | 成都理工大学能源学院, 四川 成都 610059,成都理工大学能源学院, 四川 成都 610059;成都理工大学油气藏地质及开发工程国家重点实验室, 四川 成都 610059,成都理工大学能源学院, 四川 成都 610059,成都理工大学能源学院, 四川 成都 610059,成都理工大学能源学院, 四川 成都 610059 |
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| 基金项目： | 国家自然科学基金资助项目（41204091） |
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| 摘 要： | 川东南地区下志留统小河坝组砂岩具有较好的生储盖组合条件,油气地质条件优越,但对其沉积环境为陆相还是海相沉积三角洲的厘定尚不明确。本文针对川东南地区小河坝组亟需解决的沉积环境问题,系统采集了该地区9条典型剖面的74个样品,通过微量元素比值分析方法分析其元素组成,并结合沉积构造特征分析其沉积环境及古气候环境。利用X射线荧光光谱法测试了能判别海陆相沉积环境的Sr、Ba、Mn、Cu等微量元素。结果显示,Sr/Ba平均值为0.2790,最大值为2.31,Mn/Fe值为0.0093~0.0778,Sr/Ca值为0.0005~0.0414,表现为三角洲淡水沉积特征;Sr/Ba平均值小于1,Sr/Cu平均值为4.8758,8.1%样品的Sr/Cu值大于10,总体上反映了小河坝组沉积环境为温润潮湿的古气候环境。
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| 关 键 词： | 微量元素 小河坝组 沉积环境 古气候 X射线荧光光谱法 |
| 收稿时间： | 2016-07-20 |
| 修稿时间： | 2017-03-20 |
Research on the Sedimentary and Paleoclimate Environment of the Xiaoheba Formation in Southeastern Sichuan Based on the Trace Elements Ratio Method |
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| YANG Hai-ou,WANG Chang-cheng,LI Wen-jie,DONG Hua and GONG Xiao-xing. Research on the Sedimentary and Paleoclimate Environment of the Xiaoheba Formation in Southeastern Sichuan Based on the Trace Elements Ratio Method[J]. Rock and Mineral Analysis, 2017, 36(3): 289-296 |
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| Authors: | YANG Hai-ou WANG Chang-cheng LI Wen-jie DONG Hua GONG Xiao-xing |
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| Affiliation: | College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China,College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China,College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China,College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China and College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | Lower Silurian sandstone of Xiaoheba formation in the southeast of Sichuan has good reservoir seal combination, oil and gas geological condition, but the sedimentary environment is continental or marine sedimentary deltas remains a matter of debate. In order to solve this problem,74 samples were collected from 9 typical sections. The element composition was determined by trace element ratio method, combined with the tectonic background and source characteristics, the sedimentary environment and paleoclimatic environment were discussed. X-Ray Fluorescence (XRF)Spectrometer was used to analyze Ba, Mn, Sr, Cu and other trace elements which are useful to discriminate the sea and land facies sedimentary environment. The results show that the average Sr/Ba value is 0.2790 with the maximum of 2.31, the Mn/Fe value is 0.0093-0.0778, and the Sr/Ca value is 0.0005-0.0414, indicating the freshwater delta sedimentary characteristics. The average of Sr/Ba value is less than 1, the average Sr/Cu value is 4.8758, and more than 8.1% samples have Sr/Cu values greater than 10, reflecting the warm moist ancient climate environment. |
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| Keywords: | trace elements Xiaoheba Formation sedimentary environment paleoclimate X-Ray Fluorescence Spectrometry |
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