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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Pyrolytic assessment of oil generation and expulsion from a suite of vitrinite-rich New Zealand coals
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Pyrolytic assessment of oil generation and expulsion from a suite of vitrinite-rich New Zealand coals

机译：一组富含镜质石的新西兰煤的热产生和驱出热解评估

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Pyrolysis-gas chromatography (PY-GC) of Tara-1 coals (Great South Basin, New Zealand) suggests a mean paraffinic oil potential of similar to 85 kg/t C (range similar to 70-130 kg/t C), based oil n-alkane/alkene generation in the C-6-C-31 range and typical proportions of these compounds in related oils from New Zealand. This maximum in the depth trend of pyrolysate yield is reached at -0.75-0.80% R-0, comparable to the previously reported maximum in hydrogen index (HI). Thermal extraction-GC (TE-GC) provided higher yields than Rock-Eval S1 pyrolysis, but without the uniform trend exhibited by S1/C below the similar to 3.0 km below sea floor (similar to 0.75-0.80% R-0) onset of expulsion. In addition, the saturates:aromatics ratio in the thermal extract decreased with depth, indicating preferential retention of aromatics, which may affect the expulsion efficiency of paraffins. Thermal extracts suggest that at most similar to 15 kg/t C of paraffinic oil is retained within the Tara coals, which is lower than previous estimates of saturation threshold. However, it is likely to be adversely affected (lowered) by loss of the least volatile components during recovery and storage of cuttings and incomplete recovery of high molecular weight components (particularly C40+ paraffins) using TE-GC. Isopimarane generation appears to be restricted to the depth zone corresponding to the early oil window, although it is unclear whether this is directly related to the maturity range required for such generation or that only the latest Cretaceous coals in Tara-1 exhibit particularly high abundances of such gymnosperm-derived diterpanes. (C) 2008 Elsevier Ltd. All rights reserved.
机译：基于Tara-1煤的热解气相色谱法（PY-GC）（新西兰大南盆地）表明，平均石蜡油潜力约为85 kg / t C（范围约为70-130 kg / t C），基于产自C-6-C-31范围的正构烷烃/烯烃，以及这些化合物在新西兰相关油中的典型比例。在-0.75-0.80％R-0处，热解产物产率的深度趋势达到了最大值，与先前报道的氢指数（HI）的最大值相当。热萃取-GC（TE-GC）的产率高于Rock-Eval S1热解，但在低于海平面以下3.0 km（类似于0.75-0.80％R-0）的情况下，S1 / C并没有表现出一致的趋势被驱逐。另外，热提取物中的饱和物：芳族化合物的比率随深度降低，表明芳族化合物的优先保留，这可能影响石蜡的排出效率。热萃取表明，塔拉煤中最多保留了类似于15 kg / t C的石蜡油，这比之前的饱和度阈值估计要低。但是，在切屑的回收和储存过程中，挥发份最少的组分的损失以及使用TE-GC回收的高分子量组分（尤其是C40 +石蜡）的不完全回收可能会不利地影响（降低）挥发物。异环烷烃的生成似乎仅限于与早期油窗相对应的深度带，尽管目前尚不清楚这是否与这种生成所需的成熟度直接相关，还是仅塔拉一号中的最新白垩纪煤才显示出特别高的丰度。这样的裸子植物衍生的二萜。 （C）2008 Elsevier Ltd.保留所有权利。

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