Xiao Jiaojing, Wang Longzhang, Chen Mei, Chen Zhibin, Zhou Jie, Chen Peng. Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 618-624. doi: 10.11781/sysydz201705618
Citation: Xiao Jiaojing, Wang Longzhang, Chen Mei, Chen Zhibin, Zhou Jie, Chen Peng. Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 618-624. doi: 10.11781/sysydz201705618

Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin

doi: 10.11781/sysydz201705618
  • Received Date: 2017-03-14
  • Rev Recd Date: 2017-07-18
  • Publish Date: 2017-09-28
  • Multiple scale sequences of carbonate oolitic bank developed in Jichang profile of the northeastern Sichuan Basin in the Early Triassic. Several isotopic and elemental proxies were used to reveal the sea-level fluctuation when those sequences formed. The changes of carbon and oxygen isotopes, which are coincident with the high frequency sea level fluctuation, could be used for stratigraphic sequence division. δ13C increasing and δ18O decreasing are used as the proxies of sea level rising, showed in regressive parasequence sets. δ13C decreasing and δ18O increasing are used as the proxies of sea level falling, detected from trangressive parasequence sets. Five parasequence sets, named as pss1-pss5, were distinguished from the first and second members of the Feixianguan Formation from where we sampled. 5 fifth order cycles of sea level fluctuation were recognized and grouped into 2 forth order cycles of sea level fluctuation. The Sr and Mn contents indicate the low frequency fluctuation of sea level, indicating the background of sedimentary and diagenetic environment. The increasing contents of Sr isotope are coincide with the long-term fluctuation of global sea level. Mn contents are related to water depth, enriching in deep water and poor in shallow littoral water. The Sr, Mn content changes indicate the long-term trend of the sea level fluctuation.

     

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