未成熟-低成熟煤系烃源岩生烃潜力的评价——以塔东北地区为例

Assessment Standards for Hydrocarbon-Generating Potential of Hydrocarbon Source Rock in Immature to Low-Matured Coal Measures in Northeastern Tarim Basin

在大量实验分析数据的基础上 ,建立了塔东北地区中、下侏罗统煤系烃源岩煤、碳质泥岩和暗色泥岩的生烃潜力评价标准以及作为生油岩时的生油潜力评价标准 .探讨了作为煤系不同源岩生烃潜力评价的主要指标 ,指出氢指数是评价煤系烃源岩生油潜力的关键指标 .通过与湖相烃源岩评价标准的对比 ,指出了煤系烃源岩生排烃的特点 ,认为煤系烃源岩生烃潜力评价标准具有较强的区域性 ,难以构成一个统一的标准 ,每个地区建立相应的评价标准是很有必要的 。

Based on a large number of experimental data, the assessment standards of hydrocarbon generating and oil generating potential of hydrocarbon source rock of Lower and Middle Jurassic coal measures in the northeast Tarim Basin were discussed. The assessment standards were established respectively for coals, carbonaceous mudstones, and dark mudstones. Several main assessment indexes of these different source rocks were analyzed, in which the hydrogen index ( I H ) was a key to assessing hydrocarbon generating potential. The characteristics of hydrocarbon generating and hydrocarbon discharging were pointed out in contrast to the assessment standards of lake facies hydrocarbon source rock. And comparing with the assessment standards of hydrocarbon source rock of coal measures, the authors hold that the standards for assessing hydrocarbon generating potential vary from region to region and there might be no universal standard. So it is necessary to establish an assessment standard corresponding to each area. The sedimentary environment might be also the primary factor influencing the assessment standards.