近年来在中国古生界新发现大中型油气田40多个,其中大型油气田16个.在长期研究中国古生代海相沉积特征的基础上.总结归纳近几年来新发现的海相烃源岩,提出对碳酸盐岩有效烃源岩的新认识.从有效烃源岩、古岩溶储集体、油气成藏期次和成藏模式等四个方面概述油气成藏理论方面的新进展:根据油气成藏史研究,结合区域构造演化史、生烃史等,提出塔河油田奥陶系有四个成藏期:加里东中晚期至海西早期;海西晚期;燕山期一喜马拉雅早中期;喜马拉雅晚期.

The sedimentary characteristics of marine source rocks discovered in recent years are generalized. As the aspects of the paleokarstic reservoir bodies，and the phrases and models of hydrocarbon accumulation，the progress on the theory of hydrocarbon accumulation in Paleozoic marine carbonate rocks is summed up and a new thought about available carbonate source rocks is suggested. A case of accumulation phrase of Ordovician hydrocarbon in Tahe Field is exampled and analyzed.