碳酸盐岩成岩圈闭与四川的油气勘探

四川的油气勘探开发已经有相当长的历史,在四川盆地的不同构造,不同层位找到了许多油气田。目前正面临着这样一个问题：当以构造为对象的勘探工作快要接近尾声的时候,下一步工作应当怎么办？构造只占整个四川盆地很小的比例,在构造之外的广阔地区,是不是就没有获得工业油气的希望？针对四川碳酸盐岩油气勘探的现状,本文着重指出,除了要用传统的概念（构造勘探）继续扩大油气资源外同时还应该用新概念在老油气区寻找新的油气田,即把视线扩大到构造圈之外的广阔地区。本文认为七十年代末期提出的成岩圈闭的理论是解决这个问题的途径之一。本文回顾了“成岩圈闭”研究的现状,讨论了成岩圈闭形成的机理,成岩圈闭的分类、以及各类成岩圈闭的特征。在分析四川石油勘探部分资料的基础上,探讨了四川盆地碳酸盐岩储层形成成岩圈闭的有利条件和寻找这种圈闭的方法。

THE CARBONATE DIAGENETIC TRAP AND THE EXPLORATION OF OIL AND GAS IN SICHUAN

We have been exploring oil and gas in Sichuan for a long time, and have discovered a great number of oil and gas fields in Sichuan, most of which are structural and formed of Carbonates.Now we are facing a problem-what to do after most structural traps have been discovered. In addition to structural traps, we must explore stratigraphic taps and diagenetic traps.As a matter of fact, some diagenetic traps have been discoverde already. Besides, in present paper the mechanism, classification and characteristics of diagenetic traps are discussed, and latest information about diagenetic traps is intrlduced.Finally, we have discussed the problem how to explore carbonate diagenetic traps in Sichuan.