江汉平原加里东期古隆起对震旦系-下古生界成藏条件的控制作用

通过对江汉平原及周缘沉积充填演化研究表明，江汉平原加里东期古隆起控制了震旦系下古生界烃源岩、储层的分布。烃源岩主要分布于古隆起南、北两侧相邻的深坳陷区，而古隆起上不发育；受古隆起影响震旦系陡山沱组、下寒武统牛蹄塘组2套主要烃源层横向上演化具有明显的差异性，坳陷区烃源岩演化进程早于斜坡带和古隆起区，烃源岩演化总体表现为南早北晚、西早东晚的特点。古隆起发育区以局限台地潮坪--溻湖沉积环境为主，有利于白云岩储层发育，由于古隆起及周缘地区水体浅、海平面升降频繁，白云岩储层在成岩阶段受到多期岩溶作用改造有利于储集性能改善，在加里东期古隆起控制下形成了震旦系灯影组、下寒武统石龙洞组、上寒武统3套良好的岩溶作用改造型储层。加里东期古隆起是早期液态烃运移聚集的有利指向区，是目前江汉平原震旦系下古生界油气勘探突破的有利地区。

CONTROLS OF THE CALEDONIAN PALEOUPLIFT TO THE SINIAN -LOWER PALAEOZOIC RESERVOIRING CONDITIONS IN JIANGHAN PLAIN

The study on the sedimentary filling and evolution in and around Jianghan Plain indicated that the Sinian-Lower Paleozoic source rocks and reservoirs in Jianghan Plain were controlled by the Caledonian paleouplift.The source rocks occured mostly in the deep depression area adjacent to the southern and northern flanks of the paleouplift,rather than in the paleouplift.Due to the paleouplift,the Sinian Doushantuo Formation was laterally significantly different in source rock from the Lower Cambrian Niutitang F...