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塔里木板块中央隆起区奥陶系碳酸盐岩台地东南缘的古城4井钻遇约130m厚的中奥陶统达瑞威尔阶一间房组灰岩。该组下部为表附藻-肾形钙藻-瓶筐石礁丘群落,间夹有薄层砂屑滩,海水深度推测位于10-30m的潮下带至正常波浪带之间;上部为中-低能带藻屑砂屑组合,灰泥含量增高,大致指示正常波浪带之下到最大浪基面之间30-60m的深度。古城4井与中央隆起区西北部巴楚露头区同期沉积均显示海水逐渐加深的过程,到上奥陶统桑比阶吐木休克组沉积期两地都达到了奥陶系的最大海泛面。
In the central uplifted area of the Tarim plate, the ancient city 4 in the southeastern margin of the Ordovician carbonate platform met the limestone of the Middle Ordovician Darvairian-Icunfang Formation about 130 m thick. The lower part of the group is epikarst algal-kidney-shaped calcium algae-basket basaltic rock reef community, sandwiched between the sand sand beach, the depth of the sea is located between 10-30m in the subtidal zone to normal wave zone; the upper is in - Low-energy algal-litter assemblage with increased stucco generally indicates a depth of 30-60 m below the maximum wave basal plane below the normal wave zone. The sedimentation of the ancient city 4 well and the Bachu outcrop area in the northwestern part of the central uplift all showed a process of gradual deepening of the sea water. Both of the sediments of the Upper Ordovician Sambi-Fumu Shike Shock Group reached the maximum sea surface area of the Ordovician .