【摘要】 礁滩体储层是中国目前碳酸盐岩勘探的重点。塔里木盆地奥陶系礁滩复合储集体发育,中奥陶统生物礁发育层位主要在一间房组,发育区集中分布在塔北、巴楚等地,并以开阔台地台内点礁方式出现。HD23井区内共有奥陶系探井4口,其中HD17井、HD13井、YW2井在中奥陶统一间房组都钻遇了托盘类瓶筐石(Calathium)障积礁,礁的厚度约5m,礁的上下地层均为砂屑鲕粒灰岩和砂砾屑灰岩等滩相沉积,形成礁滩复合体。文中通过钻井资料和地球物理资料,深入研究了HD23井区礁滩体的特征与分布。三维地震解释显示一间房组地层中存在一个厚度异常体,经分析认为该异常体就是局部异常发育的瓶筐石生物礁滩复合体,该生物礁滩体横向连片,有一定的分布范围和规模。对该井区内中奥陶统一间房组的生物礁滩体加以研究,将为下一步奥陶系的油气勘探提供依据。更多还原

【Abstract】 Middle Ordovician organic reefs in Tarim Basin mainly develop in Yijianfang Formation and are chiefly distributed in Tabei and Bachu areas with patch reef in open platform development.There are four Ordovician exploration wells at Wellblock HD23,in which HD17,HD13 and YW2 are found Calathium reefs in drilling,the thickness of the reef is about five meters,the upper and lower strata of the reefs is composed by arene oolitic limestone and gritty limestone.The explanation of 3D seismics at Wellblock HD23 exhibit that there are a thickness anomalous body in the strata of Yijianfang Formation,by analyzing,the anomalous body is the locally anomalous development of calathium reef-banks complex.The reef-banks complex is lateral sectors-connecting and has certain distribution scope and scale.The research of reef-banks complex of Middle Ordovician Yijianfang Formation at the wellblock will provide reference for the next step of Ordovician exploration activity.更多还原