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在克拉2气田大量的天然气组分和组分的碳同位素以及其他分析资料的基础上,讨论了克拉2气田天然气的地球化学特征、来源、成因及成藏过程.克拉2气田天然气组分偏“干”,干燥系数近于1.0,且碳同位素明显偏重,如δ~(13)C_1均值为-27.36‰,δ~(13)C_2均值为-18.5‰.综合分析认为,库车油气系统腐殖型天然气主要来源于三叠和侏罗系烃源岩,并且侏罗系烃源岩的贡献可能要大于三叠系.克拉2天然气组分偏干、同位素偏重的主要原因是克拉2天然气为腐殖型烃源岩为主的晚期阶段聚集的产物同时也受异常高压的影响.结合源岩生烃史和构造发育史,可将克拉2气田的成藏概括为两次充注、两次调整(破坏)的形成过程,即喜山早期油气充注、破坏过程和喜山晚期的天然气充注、调整过程.
On the basis of a large amount of carbon isotopes of natural gas components and components and other analysis data in Kela 2 gas field, the geochemical characteristics, sources, genesis and process of natural gas formation in Kela-2 gas field are discussed. The dry coefficient was close to 1.0, and the carbon isotopes were obviously heavier. For example, the δ 13 C 1 mean was -27.36 ‰ and the δ 13 C 2 mean was -18.5 ‰. According to the comprehensive analysis, Type natural gas mainly comes from Triassic and Jurassic source rocks, and the contribution of Jurassic source rocks may be greater than that of Triassic. The natural gas components of Karat 2 are over-dry and the main reason for the heavy isotope bias is that Kra 2 natural gas is rot Due to the hydrocarbon generation history and tectonic history of the source rock, the hydrocarbon accumulation in the late stage of the main source rocks is also affected by abnormally high pressures. The hydrocarbon accumulation in the Kela-2 gas field can be summarized as two filling and two adjustments Destruction) formation process, that is, early Himalayan oil and gas filling and sabotage process and the late Himalayan natural gas filling and adjustment process.