中文摘要：

尽管从油击碎的气体被相信了是在高度成熟的海洋的盆的重要来源之一，仍然它的资源潜力和化学、同位素的作文上有一些争论。在这研究，从在中央 Tarim 盆的井 TZ62 的志留纪水库的一件寒武纪来源的海洋的油样品是用有二个不同热分解计划的封上的金试管的 pyrolyzed：在一个封闭系统的连续热分解和逐步的半开的热分解。结果证明最大的重量 C _{1 产出 5} 气体在这成熟仅仅是 43.4 mL/g 以后，发生在 EasyRo=2.3% 和剩余气体潜力，在 EasyRo=2.3% 的 361 mL/g 的大约 12% 产量。与运动建模的结果结合了，从油裂开的煤气的产生的主要阶段在 EasyRo=1.6% 2.3% 以内被相信。C _{1 的体积收益的增加在在一个封闭系统的 EasyRo】2.3% 的 5} 气体主要与有关以前形成的 C _{2 重新击碎 5} 湿气体，不是油的直接裂开。逐步的热分解实验证明从在 EasyRo】2.3% 裂开剩余油的气体被很高的干索引描绘(比 92% 高) 并且重甲烷碳同位素从 −28.7%到 −26.7% ，它与从在一个封闭系统的连续热分解的气体相当不同。在煤气的产生(EasyRo【2.3%) 的主要舞台以内的甲烷的碳同位素比先锋的碳同位素远轻的甲烷碳同位素分别表演的运动建模在 2 ° C /Ma 的地质的加热率下面上油。上述观察和结果提供一些新线索给精确识别和在高度成熟的海洋的盆击碎气体的油的客观资源评估。

英文摘要：

Although the gas cracked from oil has been believed to be one of the important sources in highly matured marine basins, there are still some debates on its resource potentials and chemical and isotopic compositions. In this study a Cambrian-sourced marine oil sample from the Silurian reservoir of well TZ62 in the central Tarim basin was pyrolyzed using sealed gold tubes with two different pyrolysis schemes： continuous pyrolysis in a closed system and stepwise semi-open pyrolysis. The results show that the maximum weight yield of C1-5 gases occurs at EasyRo=2.3% and the residual gas potential after this maturity is only 43.4 mL/g, about 12% of the yield of 361mL/g at EasyRo=2.3%. Combined with the results of kinetic modeling, the main stage of gas generation from oil cracking is believed within the EasyRo=1.6%-2.3%. The increase in the volume yield of C1-5 gases at EasyRo〉2.3% in a closed system is mainly related to the re-cracking of previously formed C2-5 wet gases, not the direct cracking of oil. The stepwise pyrolysis experiments show that the gas from the cracking of residual oil at EasyRo〉2.3% is characterized by very high dryness index （higher than 92%） and heavy methane carbon isotopes ranging from -28.7‰ to -26.7‰, which is quite different from the gases from the continuous pyrolysis in a closed system. The kinetic modeling of methane carbon isotope fractionation shows that the carbon isotopes of methane within the main stage of gas generation （EasyRo〈2.3%） are far lighter than the carbon isotopes of the precursor oils under a geological heating rate of 2℃/Ma. The above observations and results provide some new clues to the accurate recognition and objective resource evaluation of oil cracking gas in highly mature marine basins.