石油实验地质2017，Vol.39Issue(5)：618-624,7.DOI:10.11781/sysydz201705618
四川盆地早三叠世多尺度海平面变化旋回及对储层发育的影响
Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin
摘要
Abstract
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 fluc?tuation 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. δ13 C increasing and δ18 O decreasing are used as the proxies of sea level rising, showed in regressive parasequence sets. δ13 C decreasing and δ18 O 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 fluc?tuation 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.关键词
碳氧同位素/海平面变化/层序/早三叠世/四川盆地Key words
carbon and oxygen isotopes/sea level fluctuation/sequence stratigraphy/Early Triassic/Sichuan Basin分类
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肖娇静,王龙樟,陈梅,陈志斌,周杰,陈鹏..四川盆地早三叠世多尺度海平面变化旋回及对储层发育的影响[J].石油实验地质,2017,39(5):618-624,7.基金项目
中国石油化工股份有限公司基础攻关项目"川东北碳酸盐岩沉积相及储层建模研究"及"川东北台缘沉积建模及地震沉积学研究". （）
