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中原油田等单位,经过一年多的攻关和勘探实践,对煤成气藏的形成与分布规律取得以下五个方面的新认识: 第一,通过地质条件及地球化学特征研究,对于东濮凹陷文留气藏可以肯定是煤成气。进而总结了碳同位素和氩同位素比较富集、汞蒸汽浓度较大,以及中等成熟度地区出现凝析油等特点,是识别煤成气较有效的指标。第二,通过对已发现的煤成气藏(如文留气藏、长庆胜利井气藏四川中坝气藏等)形成条件的分析,认为圈闭条件和盖层保存条件对煤成气藏的形成,影响很大。由于天然气具有更活泼的流动性,所以寻找煤成气既要考虑煤系地层本身,还要注意与煤系地层相邻的或稍远些的地区。
Zhongyuan Oilfield and other units, after more than a year of research and exploration practices, the formation and distribution of coal gas reservoirs obtained the following five new understanding: First, through the geological conditions and geochemical characteristics of research, Dongpu depression Wen Liu gas reservoirs can certainly be coal into gas. Further more, it is concluded that the carbon isotope and argon isotopes are relatively enriched, the mercury vapor concentration is relatively high, and the condensate oil appears in the medium maturity areas. Second, through the analysis of the formation conditions of coal-derived gas reservoirs that have been discovered (such as Wenliu gas reservoir and Zhongba gas reservoir of Shengli well in Changqing) The formation of possession, great influence. Because natural gas has a more lively liquidity, looking for coal gas must take into account both the coal system strata and the adjacent or slightly farther areas of the coal system.