湖相碳酸盐岩的石油地质意义

THE IMPLICATIONS OF PETROLEUM GEOLOGY OF LACUSTRINE CARBONATE ROCKS

本文主要对湖相碳酸盐岩的生油能力、储集条件、油气藏类型以及对湖相碳酸盐岩隐蔽油气藏的勘探方法进行了规律性的讨论和总结。认为半深湖和深湖相碳酸盐岩可成为良好的生油岩;滩相和生物礁相灰(云)岩可成为良好的储集层;其储集空间可有原生孔隙、次生溶孔和溶洞、裂缝及复合型孔缝等;油气藏类型以岩性、地层圈闭为主,也有成岩圈闭和构造圈闭类型。此外,还从不同角度对湖相碳酸盐岩隐蔽油气藏的研究手段和勘探方法进行了概括性总结。

The petroleum potential, reservoir conditions, the types of oil /gas pools and exploratory method of hidden oil/gas traps developed in lacustrine carbonate rocks were discussed. It is concluded that the carbonate rocks in semi-lacustrine and deep lacustrine fa-cies would be good source rocks;and limestones (dolomites) of beach and bioherm facies may be regarded as favourable reservoirs. While their reservoir spaces include primary porosity, secondary corroded hollows and caverns, fissures and composite pores. Litholog-ic and stratigraphic traps are dominant, along with diagenetic and structural traps as less common oil/gas pools. Moreover, from various angles ,the paper comes to a brief conclusion on the research approaches and exploratory methods for hidden oil/gas pools in lacustrine carbonate rocks.