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为了评价和认识天然气勘探已获重大突破的松辽盆地深层中部断陷带之外断陷的勘探潜力,利用龙深1井风险探井的分析资料,从定性评价和定量计算的结合上,对英台断陷的气源条件和勘探潜力进行了系统研究。结果表明:英台断陷深层营城组、沙河子组不仅暗色泥岩较为发育、残余有机质丰度较高、有机质普遍处于有利于大量成气的高—过成熟阶段,而且有机质类型并不像前人认为的那样以III型有机质为主,而是以绝对成气潜力更高的Ⅱ1、Ⅱ2型为主,这进一步提高了深层断陷的成气潜力;恢复之后的有机质原始丰度和原始生烃潜力更高,体现了恢复对客观评价高—过成熟源岩的重要意义;初步的定量评价表明,英台断陷的天然气资源量为(938～3758)×108m3,具有形成大中型气田(群)的气源条件。这也可能意味着松辽盆地除了中部的徐家围子和长岭断陷之外,其它断陷也具备值得重视、探索的勘探潜力。
In order to evaluate and recognize the exploration potential of the fault depression outside the deep central section of the Songliao Basin, which has been greatly explored in natural gas exploration, based on the analysis data of risk exploration wells in Well Longshen-1, combining the qualitative and quantitative calculations, Gas source conditions and exploration potential of the Tarim Basin have been studied systematically. The results show that not only the dark mudstones of Yingcheng Formation and Shahezi Formation of Yingtai Fault Depression are well developed, but also the abundance of residual organic matter is high, and the organic matter is generally in the high-over mature stage which is favorable to a large amount of gas accumulation. It is mainly based on the type III organic matter that human beings believe, but based on the type II1 and type II2 with higher potential for absolute gas formation, which further enhances the potential of adult gas in deep faulted depression. After the restoration, the original abundance of organic matter The hydrocarbon potential is higher, reflecting the importance of recovery to the objective evaluation of high-over-maturity source rocks. The preliminary quantitative assessment shows that the natural gas resources in the Yingtai rift are (938 ~ 3758) × 108m3, Group) of the gas source conditions. This may also mean that in addition to the Xujiaweizi and Changling Faults in the central part of Songliao Basin, other fault depressions also have exploration potential that is worthy of attention.