鄂尔多斯盆地奥陶系白云岩碳氧同位素分析

刘德良; 孙先如; 李振生; 唐南安; 谈迎; 刘波

doi:10.11781/sysydz200602155

鄂尔多斯盆地奥陶系白云岩碳氧同位素分析

doi: 10.11781/sysydz200602155

1.
中国科技大学, 地球与空间科学院, 合肥, 230026
2. 安徽地质实验研究所, 合肥, 230001
3. 中国地质科学院, 西安地质矿产研究所, 西安, 710054

基金项目: 国家自然科学基金(40472074);国家重点基础研究规划项目(2001CB209133)

详细信息

作者简介:
刘德良(1938- ),男(汉族),安徽凤阳人,教授、博士生导师,从事构造地质学、构造地球化学和天然气地质学的教学和科研.

中图分类号: TE135
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出版历程
- 收稿日期: 2005-05-03
- 修回日期: 2006-01-23
- 刊出日期: 2006-03-28

ANALYSIS OF CARBON AND OXYGEN ISOTOPE ON THE ORDOVICIAN DOLOSTONES IN THE ORDOS BASIN

1.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
2. Institute of Geological Experiment of Anhui Province, Hefei, Anhui 230001, China
3. Xi'an Institute of Geology and Mineral Resources, Xi'an, Shannxi 710054, China

摘要

摘要: 对鄂尔多斯盆地奥陶系白云岩成因类型与碳氧同位素的关系进行了研究。准同生白云岩碳氧同位素值重,δ¹³C介于0.639‰~-2.2‰之间,δ¹⁸O值介于-0.2‰~-8.668‰,产生于咸化水体;成岩白云岩的δ¹³C介于0.9‰~-3.2‰,δ¹⁸O介于-1.7‰~-7.607‰,产生于高镁咸化水体;深埋白云岩碳氧同位素值轻,δ¹³C介于0.580‰~-3.7‰,δ¹⁸O介于-6.88‰~-9.97‰,形成于温度较高、盐度较低、含镁亦较低的环境。白云岩中的碳酸盐脉δ¹³C集中在-1.00‰~-5.66‰,而灰岩中碳酸盐脉δ¹³C集中在-1.30‰~-8.65‰;碳酸盐脉氧同位素值较轻且变化较小,δ¹⁸O介于-10.66‰~-18.91‰,Z峰值集中在100和110,表明碳酸盐脉形成受到淡水淋滤。
- 碳氧同位素 /
- 白云岩 /
- 奥陶系 /
- 鄂尔多斯盆地
Abstract: In order to know the formation surroundings of the Ordovician dolostone that is Lower Paleozoic reservoir of natural gas in the Ordos Basin,the relationship between its genetic type and carbon and oxygen isotope is studied.Carbon and oxygen isotope of penecontemporaneous dolostone is heavy,whose δ¹³C value varies from 0.639‰ to -2.2‰ and δ¹⁸O value does from -0.2‰ to -8.668‰.The penecontemporaneous dolomite rock forms in saline water body.δ¹³C value of diagenetic dolostone varies from 0.9‰ to -3.2‰ and δ¹⁸O does from -1.7‰ to -7.067‰.The diagenetic dolostone froms in high-magnesian saline water body.Carbon and oxygen isotope of immerged dolostone is light,whose δ¹³C value varies from 0.580‰ to -3.7‰ and δ¹⁸O value does from -6.88‰ to -9.97‰.The formation surrounding of immerged dolostone is higher temperature,lower salinity and lower-magnesium.δ¹³C value of carbonate vein in dolostone most is from -1.00‰ to -5.66‰,while that in limestone most is from -1.30‰ to -8.65‰.Oxygen isotope of carbonate vein is lighter with narrow ranges,whose value varies from -10.66‰ to -18.91‰,and its Z value most is 100 and 110.Those indicate there was fresh-water leaching during formation of carbonate vein.
- carbon and oxygen isotope /
- dolostone /
- Ordovician /
- the Ordos Basin

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