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按照天然气系统、天然气多源成因和多世代大地构造三重概念,对全球59个已发现大气田的盆地进行了综合分类,并在此基础上统计了不同盆地类型的大气田数量和储量分布。对比分析表明:(1)充分的源岩和有效的圈闭-保存条件是形成大气田的两个关键因素;(2)煤型气的大气田意义接近或超过了油型气;(3)中生代是寻找大气田的最佳盆地世代;(4)晚古生代的大气田以高储量比例为特征;(5)新生代发育了类型众多的含气盆地,所找到的大气田为数也不少,但规模偏小;(6)早古生代盆地因保存状态不佳,寻找大气田较困难;(7)我国含气盆地有不少世代属于大气田分布类型,虽然源岩条件较差,但找到一般规模的大气田似不成问题。
According to the triple concept of natural gas system, origin of multi-source of natural gas and multi-generational tectonics, the basins of 59 discovered gas fields in the world are comprehensively classified, and on the basis of this, statistics are made on the distribution of gas fields and reserves in different basin types. The comparative analysis shows that: (1) sufficient source rock and effective trapping-preservation conditions are the two key factors for the formation of a large gas field; (2) the large-scale gas field of coal gas approaches or exceeds the oil gas; (3) (4) Late Paleozoic gas fields are characterized by high reserves; (5) In the Cenozoic, a large number of gas-bearing basins are developed, and the number of large gas fields found is quite large. But the scale is small; (6) Early Paleozoic basins are difficult to find a large gas field due to poor preservation status; (7) Many genera of gas-bearing basins in China belong to the distribution type of large gas fields. Although source rock conditions are poor, Large-scale gas fields seem to be no problem.