苏北盆地高邮凹陷阜宁组一段古环境恢复及其古湖泊学意义  

Environmental recovery of paleo-lakes in the Funing formation(E_1f_1), Gaoyou Sag, Subei Basin

作　　者：丁林林[1] 傅强[1] 夏岩[1] 

机构地区：[1]同济大学海洋与地球科学学院,上海200092

出　　处：《上海国土资源》2015年第1期86-89,共4页Shanghai Land & Resources

基　　金：国家科技重大专项"鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程"(2011ZX05044)

摘　　要：沉积岩中碳氧同位素值的测定在古环境恢复方面具有重要意义。本文采用苏北盆地高邮凹陷韦马地区阜宁组一段(E1f1)的13个砂岩样品,利用MAT-252型稳定同位素比质谱仪,精确测定砂岩样品中沉积的碳酸盐岩胶结物的碳氧同位素比值。样品的碳、氧同位素值均为负值,δ13C值在-2.05‰^-6.44‰之间、δ18O值在-8.33‰^-12.08‰之间,通过计算及与海相和陆相碳酸盐岩同位素值对比得出,高邮凹陷阜宁组一段沉积时期发育淡水陆相开放性湖泊,成岩温度较低,湖泊古生产力具有分段性,由深变浅,湖泊的古生产力具有由低变高的趋势。Carbon and oxygen isotopes have been widely used as a means of reconstructing ancient environments. A totalof 13 sandstone samples were collected from the Funing Formation （E1f1） in Gaoyou Sag, WeiMa region. A MAT-252 stableisotope ratio mass spectrometer was used to measure δ18O and δ13C in all samples. δ13C values range from .2.05‰ and.6.44‰, and the δ18O values range from .8.33‰ and .12.08‰. These values are comparable with carbonate rock marineand terrestrial isotope values, suggesting that the lakes developed into the open inland freshwater lakes in Funing Formationsedimentary period. Diagenetic tempterature is low, and the ancient productivity of the lake with piecewise sex. The ancientproductivity of the lake changed from low to high with decreasing depth.

关 键 词：沉积环境 古湖泊 碳酸盐岩 碳氧同位素 高邮凹陷 阜宁组地层 

分 类 号：P736.22[天文地球—海洋地质]