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敦煌盆地的近期油气勘探工作中,XC1井揭示较好的湖相烃源岩,录井见油斑、油迹6 m/8层,荧光16.5m/7层;压裂后试油,日液0.16~10.7 m3,日油0.02~1.53 m3,累产油12.1 m3。基于中石化近几年投入的实物工作量和XC1井钻探成果,笔者通过对样品的地化分析数据和油源对比结果,认为中下侏罗统是潜在烃源岩的主要发育层段,中间沟组1段的湖相泥岩集中段为有效烃源岩,藻类体和角质体是这套源岩的主要生烃显微组分,有机质类型最好可达Ⅰ—Ⅱ1型,现有资料显示在五墩凹陷保存较完整;XC1井所发现的油藏为一次生烃的原生油藏,具有“早期生烃、早期聚集、晚期定型”的“两早一晚”的成藏特点,今后勘探关键是研究其成烃过程与圈闭配套史的关系,近源保存条件较好的岩性或构造—岩性油气藏是首选的目标。
In the recent hydrocarbon exploration work in Dunhuang Basin, the XC1 well revealed a good source rock of the lacustrine facies. Oil wells and 6m / 8 layers of oil spots were observed in the wells. Fluorescence of 16.5m / 0.16 ~ 10.7 m3, the daily oil 0.02 ~ 1.53 m3, the cumulative oil 12.1 m3. Based on the actual workload and the drilling results of XC1 well received by Sinopec in recent years, the authors analyzed the geochemical data of the samples and the comparison of oil source that the middle-lower Jurassic is the main developmental layer of potential source rocks, The lacustrine mudstone concentration section of Group 1 is an effective hydrocarbon source rock. Algae bodies and keratoplasts are the major hydrocarbon generating micro-components of this source rock. The type of organic matter is most likely to reach Type I-II1. The available data are shown in The reservoirs discovered in Well XC1 are primary hydrocarbon generation primary reservoirs, and have the characteristics of early hydrocarbon generation, early accumulation and late setting, and two early and one late accumulation. In the future, the key to exploration is to study the relationship between the hydrocarbon generation process and the supporting history of traps. The lithologic or tectonic-lithologic reservoirs with better preservation conditions near the source are the preferred targets.