第二深度空间(5000～10000m)油、气成藏和潜力分析

摘要

During the last half-century,the exploration and exploitation of oil and gas in our country mainly focused on continental sedimentary basins of Mesozoic and Cenozoic,namely,the first deep space.Whereas gas and oil in dual-phase (continental phase and marine phase) sedimentary layers in the second deep space (5000～ 10000 m) received less attention to some degree till the recent years.Through research and analyses of the formation,accumulation,migration and deep processes of oil and gas fields at home and abroad,we noted that marine sedimentary layers are widely distributed in the deep space of continental sedimentary formations.The Paleozoic strata in our country are slightly metamorphosed or non-metamorphic formations.The temperature and pressure limits of the formations of gas and oil have been surmounted by the exploring practice at home and abroad gradually.The potential of the second deep space is huge.Putting forward and putting the concepts above into effects can not only extend the deep space of the exploration of oil and gas but also are the inevitable direction of finding large scale and ultralarge scale oil and gas reservoirs in the future.%近半个世纪以来,我国的油、气勘探和开发实践主要集中在中、新生代以来的陆相沉积盆地中,即第一深度空间(＜5000 m).对第二深度空间(5000～10000 m)陆相和海相,即双相沉积建造中的油、气能源未能给予切实关注,仅为在近年来才得以重视和践行.通过对国内外诸多油、气田中的油、气成藏、储存、运移与深层过程的分析和研究发现,我国广泛陆相沉积建造的深处尚分布着丰富的海相沉积建造;且我国古生代的沉积地层确属变质很浅或不变质的层系;以往的油、气形成温度、压力和孔隙度的门限已逐被国内、外油气勘探与开发的实践所突破;第二深度空间的油、气成藏具有很大潜力.以上理念的提出与实施不仅大为扩展了勘查油、气的深部空间,更为重要的是揭示了第二深度空间将必是21世纪上、中叶在深处发现大型、超大型油、气藏的必然轨迹.