摘要
分析了塔里木盆地奥陶系礁滩体沉积时的古地理背景、礁滩体的岩石学、层序及沉积相、古生物及地球化学等特征,对塔里木盆地巴楚地区的礁滩体产出层位、主要造礁生物及沉积相带变化进行了探讨。发现礁滩复合体主要出露于中奥陶统一间房组二段台地边缘相;造礁生物以托盘类为主,其次为海绵类。在一间房组沉积期碳同位素值和氧同位素值出现小幅波动,呈小幅海进到海退序列,整体变化不大,这一阶段海平面变化范围保持相对稳定。
The Ordovician reef-flat complex is one of major oil-gas bodies in carbonate reservoirs in Tarim basin. The occurrence, reef building organisms and sedimentary facies changes of the complex were probed by analyzing characteristics of the ancient geographical setting, petrology, sequence, sedimentary facies, paleontology and geochemistry It is found that the complex is mainly developed in platform marginal facies of member-2 of Yijianfang formation of the middle Ordovician; the reef building organisms are dominated by the tray sort, followed by the sponge. δ13C and δ18O values fluctuations mean this sedimentary stage of Yijianfang formation belongs to sequence from ingression to regression with the relatively stable sea-level changes.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2012年第5期536-539,共4页
Xinjiang Petroleum Geology
基金
国家973项目(2011CB201100-03
2006CB202302)
国家科技重大专项(2011ZX05005-004-HZ06
2011ZX05009-002)
关键词
塔里木盆地
巴楚地区
中奥陶统
一间房组
礁滩体
沉积特征
Tarim basin
Baehu area
Middle Ordovician
Yijianfang formation
reef-flat complex
sedimentary characteristic
