鄂尔多斯盆地奥陶系白云岩碳氧同位素分析
Petroleum Geology & Experiment(2006)
Abstract
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。
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Key words
Ordovician,the Ordos Basin,dolostone,carbon and oxygen isotope
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