摘要
我国凝析气藏主要分布在渤海湾、塔里木、吐哈等盆地及东、南沿海陆架区。凝析气总储量约4000×10m,占天然气总储量的三分之一。气藏主要形成于陆源母质成烃体系和煤成烃体系,湖相和海相腐泥型成烃体系形成的此类气藏很少。腐殖型或偏腐殖型源岩是凝析气藏富集的内在因素,除常规气藏要求的地质条件外,温压条件必不可少,该类气藏富集的温度为70～130℃,压力为30～60MPa.综合分析认为新疆三大盆地、东北-内蒙裂谷系和东部裂陷盆地及南海、东海、渤海湾等地为凝析气藏的重点勘探地区。
Abstract
China's condensate gas pools are mainly distributed in Bobal Bay, Tarim, Turpan-Hami Basins, the East and South China coastal regions.The total reserve of the condensate gas is about 4 000 ×10 m, which is one third of total natural gas reserve.The gas pools are primarily formed from terrigenous parent materials and coal, the pools formed from lacustrine or marine sapropelic hydrocarbon-forming systems are seldom.The internal factor of condensate gas pool enrichment is humic or near humic source rocks.Excepting geological conditions needed by conventional gas pools, the condensate gas pools need temperature ranging from 70℃ to 130℃ , and pressure of 30～60 MPa.According to synthetic analysis, the target areas of condensate gas exploration should be Tarim, Turpan and Hami Basins in Xinjiang, the rift systems in Northeast China and inner Mongolia, the rift basins in the East China, the South China, the East China and Bobal Bay regions.
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