Abstract Confined pyrolysis experiments (gold capsules), quantitative flash pyrolysis-gas chromatography (Py-GC) and Rock-Eval analysis were performed on ten coals from the Junggar Basin and seven coals from the Kuqa Depression, Tarim Basin, northwestern China. The maximum yields of liquid components in confined pyrolysis experimnets (MCPΣC8+), which reflect oil potentials, have close correlations with the yields of n-alkanes + n-alkenes (FPΣn-C7+) in flash Py-GC, but have poor correlations with Rock-Eval QI ((S1 + S2)/TOC) values. Thus, oil potentials of coals can be better predicted on the basis of FPΣn-C7+ yields from flash Py-GC analysis. Coals with FPΣn-C7+ yield >10.4 mg/g TOC can generate MCPΣC8+ yield >∼22.5 mg/g TOC or oil yield >∼40 mg/g TOC in confined pyrolysis or in natural systems and are effective oil source rocks. Although both Py-GC and Rock-Eval are open systems, the yields of total liquid components (FPΣC7+) obtained from flash Py-GC have poor correlations with, and are substantially lower than, Rock-Eval QI. In contrast, FPΣC7+ values have much better correlations with oil potentials (MCPΣC8+). Coals with higher oil potentials (MCPΣC8+) generate higher amounts of liquid components detected in flash Py-GC (FPΣC7+) than those with lower oil potentials but similar Rock-Eval QI. The correlations for parameters with gas to oil ratios (GOR) in confined pyrolysis are increasingly better in the sequence of Rock-Eval QI, H/C atomic ratios, MCPΣC8+, FPΣn-C7+ and FPΣn-C7+/ΣC7+ ratios. GOR of petroleum generated from coals within oil generative window can be reasonably predicted on the basis of FPΣn-C7+/ΣC7+ ratio from flash Py-GC analysis.

中文翻译：

---

基于闪蒸 Py-GC、Rock-Eval 和受限热解实验评估腐殖质煤的石油潜力

摘要 对准噶尔盆地10种煤和塔里木盆地库车坳陷7种煤进行了密闭热解实验（金胶囊）、定量闪蒸热解-气相色谱（Py-GC）和Rock-Eval分析。受限热解实验中液体组分的最大产率（MCPΣC8+）反映了石油潜力，与闪蒸 Py-GC 中正构烷烃+正构烯烃（FPΣn-C7+）的产率密切相关，但与岩石相关性较差-Eval QI ((S1 + S2)/TOC) 值。因此，基于来自闪蒸 Py-GC 分析的 FPΣn-C7+ 产率，可以更好地预测煤的石油潜力。FPΣn-C7+ 产率 >10.4 mg/g TOC 的煤在封闭热解或自然系统中可以产生 MCPΣC8+ 产率 >~22.5 mg/g TOC 或石油产率 >~40 mg/g TOC，是有效的油源岩。尽管 Py-GC 和 Rock-Eval 都是开放系统，但从快速 Py-GC 中获得的总液体组分 (FPΣC7+) 的产率与 Rock-Eval QI 的相关性较差，并且大大低于 Rock-Eval QI。相比之下，FPΣC7+ 值与石油潜力 (MCPΣC8+) 的相关性要好得多。与油势较低但 Rock-Eval QI 相似的煤相比，油势较高 (MCPΣC8+) 的煤在闪蒸 Py-GC (FPΣC7+) 中检测到的液体成分量更高。受限热解中参数与气油比 (GOR) 的相关性在 Rock-Eval QI、H/C 原子比、MCPΣC8+、FPΣn-C7+ 和 FPΣn-C7+/ΣC7+ 比的顺序中越来越好。基于闪蒸 Py-GC 分析的 FPΣn-C7+/ΣC7+ 比值，可以合理预测生油窗口内煤生成石油的 GOR。