摘要
本文对全球已知的84个大型、超大型气田作了较系统的数理统计。天然气藏是生聚散动态平衡的产物;源岩生气高峰时代越新、构造环境越稳定,越具前景。早第三纪是全球大气田源岩的主要生气高峰期;腐殖型大气田为含煤岩系中早期生气阶段所形成,而腐泥型大气田源岩的生气高峰期较晚;源岩体积巨大和生气高峰时代较晚并处于相对稳定沉降构造环境,是形成大气田的有利区带。我国塔里木和南海、东海、台西海域以及鄂尔多斯、四川、楚雄盆地等,其生气高峰时代较晚、构造环境相对稳定,都是天然气有利聚集保存区带。
84 global big and giant known gas fields were analysed for systematic mathematical statistics.Natural gas pools were the products resulted from the dynamic equilibriums of generation, accumulation and separation; the newer the age of peak gas generation for source rocks and the more stable the structural conditions were, the more promising the prospect would be. Eogene was the period of peak gas generation for source rocks of global large gas fields; and humic gas fields were formed in coal-bearing series during the early stage of gas generation.
Regions with huge volumes of source rocks, peak gas generation and the structural conditions of rather stable subsidence are favourable to the formation of large gas fields.Tarim, South China Sea, East China Sea, West Taiwan Seas, Ordos, Sichuan and Chuxiong Basins, are all favourable regions for the accumulation and preservation of natural gas for their later peak gas generation and stable structural conditions.
出处
《石油实验地质》
CAS
CSCD
北大核心
1990年第3期213-231,共19页
Petroleum Geology & Experiment
