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鄂尔多斯奥陶系碳酸盐岩碳氧同位素特征及其意义*

DOI: 10.7605/gdlxb.2012.01.010, PP. 117-124

Keywords: 碳氧同位素,古环境,石油地质,奥陶系,鄂尔多斯

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Abstract:

鄂尔多斯古生代海相地层沉积厚度巨大。鄂尔多斯奥陶系碳酸盐岩的碳氧同位素组成受后期成岩作用影响较小,基本保留了原始海洋的同位素组成:δ13C值分布于-7.30‰~2.26‰之间,均值-0.30‰;δ18O值分布于-13.14‰~-1.94‰之间,均值-6.38‰,碳氧同位素组成与全球基本一致。区域上,鄂尔多斯西缘具有相对较高的δ13C值,南缘次之,而东缘最低。纵向上,碳同位素组成逐渐增重,并在中晚奥陶世发生明显的正向偏移,δ13C均值由马家沟组的-0.36‰增加到平凉组的0.15‰,至背锅山组增加至0.68‰。碳同位素的区域分布差异表明鄂尔多斯西缘水体相对较深,南缘次之,东缘相对较浅,由早奥陶世至晚奥陶世水体逐渐加深,碳同位素组成反映的海平面变化趋势与沉积相演化一致。鄂尔多斯西南缘中晚奥陶世碳同位素组成的正向偏移,标志着较高的生产力和有机碳埋藏率,具有重要的石油地质学意义,西南缘的平凉组/乌拉力克组和背锅山组是下古生界最重要和有效的烃源岩层。

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