深盆气的成因成藏机理及勘探前景

The Origin , Reservoir Formation Mechanism and Exploration Prospect of Deep-basin Gas

王屿涛,曹　菁,李保民,刘全艳

Wang Yutao ,Cao Qing, Li Baomin, et al

新疆油田公司勘探开发研究院

Research Institute of Exploration and Development , Xinjiang Oilf ield Company , SINOPEC, Xinjiang 834000 P. R. China

深盆气作为非常规天然气资源,有其特殊的成因成藏机理。总结归纳了深盆气生成和富集的地质规律,提出前陆盆地是形成深盆气藏的有利地区,腐植型有机质是深盆气的主要来源;气水关系倒置是深盆气成藏的重要模式。同时,就深盆气的资源评价方法进行了探讨;最后结合准噶尔盆地实际,分析了深盆气形成的地质条件,提出北天山山前坳陷侏罗系是勘探深盆气的有利地区。

As a type of unconventional natural gas resource , the deep-basin gas has its own unique origin and reservoir formation mechanism. This paper summarized the geological law of deep-basin gas generation and enrichment and proposed that the foreland basin is a favorable region for deep-basin gas accumulation. The humic-type organic matter is the main source of deep-basin gas. Gas-water inversion is the dominant pattern of the deep-basin gas accumulation. Meanwhile , the paper also made some discussions on the deep-basin gas resource evaluation. Finally , combining with the facts of Junggar Basin ,the author analyzed the geological conditions of deep-basin gas formation and suggested that the Jurassic North-Tianshan Piedmont Depression is the favorable area for deep-basin gas exploration.