The Characteristics of Reef and Bank and the Fluctuation of Sea-level in Feixianguan Period of Late Permian-Early Triassic,East Sichuan Basin
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摘要: 据四川盆地东部上二叠统—下三叠统飞仙关组沉积特征和储层分布规律,认为区内长兴组生物礁和飞仙关组鲕粒滩特征和分布与海平面升降有关。长兴期生物礁发育于海平面快速上升阶段的缓坡坡折地带和缓坡内的局部,当生物礁的生长速度低于海平面的上升速度时,形成海侵追补型生物礁,当生物礁生长速度大于海平面上升速度时,则构成海侵并进型生物礁;飞仙关鲕粒滩形成于海平面下降阶段的台地边缘和台内局部地区,单一台地边缘鲕粒滩分布广、厚度大,而台内鲕粒滩数量虽多,但单一厚度小,分布范围窄。总体来看,长兴生物礁发育层位逐渐向海侵方向升高,而飞仙关鲕粒滩随海退的进行,向台地增生方向迁移。区内上二叠统—下三叠统飞仙关组是一次较大规模海平面升降过程中的产物,海侵始于吴家坪初期,长兴期海平面快速上升,至飞仙关初期达到最高海平面,海平面开始下降,直至飞仙关末期。Abstract: On the basis of the sedimentary characteristics and reservoir distribution law in Feixianguan Formation of Upper Permian-Lower Triassic,East Sichuan Basin, it can be determined that the characteristics and distribution of Changxin reefs and Feixiangguan oolitic banks are tighly relevent to the fluctuation of sea-level.The Changxin reefs developed during the rapid rising of sea-level on the ramp and inner ramp. When the growing speed of the reefs was lower than the rising one of sea-level,catch-up transgression reefs were formed,and when growing speed of the reefs was quicker than the rising one of sea-level,keep-up transgression reefs were formed.The Feixianguan oolitic banks were formed on the inner platform rim and some inner platform areas during the regression of sea-level, single platform rim banks were distributed widely and thickly,although the inner platform banks were of large number,they were thin and narrow in range.So,development formations of Changxin reefs rose towards transgression direction,and the Feixianguan oolitic banks migrated towards platform expandtion with regression. The Formation was deposited in a large scale of fluctuation of sea-level,the transgression begun in the early Wujiapin period, sea-level rose rapidly in the Changxin period ,and it reached summit in the early Feixianguan period,then lowered down in the following Feixianguan period until to the end of the time.
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Key words:
- Changxin Formation /
- Feixianguan Formation /
- reefs /
- oolitic bank /
- sea-level
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