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深盆气,就圈闭类型而言,在其主体含气范围内也属隐蔽性地层-岩性圈闭,但二者的成藏机制不同,尤其在油气水分布规律上有重大差别。深盆气显著的标志是,上倾高部位含水、低部位含气,呈现“气水倒置”的展布态势;而通常的非背斜隐蔽性油气藏,则遵循上气下水的常规分布格局。深盆气理论的积极意义在于,它突破了“避开低部位出水、在高位找气”的常规勘探思路,着力于在盆地(坳陷)深处或斜坡下倾深部位找气,从而拓宽了天然气勘探的思路和领域。最近,Ben E.Law在盆地中心气(Basin-centered gas systems)一文中对全球性深盆气作了系统论述。他列出了遍布北美、南美、欧洲、亚太、南亚、中东和非洲的72个存在和可能发育深盆气的盆地或地区。其中包括中国的鄂尔多斯、四川和准噶尔等3个盆地,而且均被列为确定性高的一类。因此,总结该盆气深盆气勘探实践与问题,对进一步开展国内深盆气的研究和勘探会有积极作用。
Deep basin gas is also a subtle stratigraphic-lithologic traps in terms of trap types, but different reservoir forming mechanisms, especially significant differences in the laws of oil and gas distribution. The significant sign of deep basin gas is that the water in the upper part of the updip and the gas in the lower part have the tendency of “gas-water inversion”, while the usual non-anticlinal concealed reservoirs follow the normal distribution pattern of gas and water . The positive significance of the theory of deep basin gas lies in that it breaks through the conventional exploration idea of “avoiding the water in the lower part and looking for gas at a high position”, concentrating on finding gas in the depths of the basin (slope) The idea and field of natural gas exploration. Recently, Ben E. Law in the basin-centered gas systems systematically discusses the global deep-basin gas. He lists 72 basins or areas that exist and may develop deep-seated gas in North America, South America, Europe, Asia-Pacific, South Asia, the Middle East and Africa. Including China Ordos, Sichuan and Junggar three basins, and are classified as a high certainty. Therefore, to summarize the practices and problems of deep basin gas exploration in this basin can have a positive effect on the further research and exploration of deep basin gas in China.