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GC_C_MS(色谱 燃烧 质谱 )同位素在线分析仪器的出现以及对这一仪器的开发 ,使1 0 -2 ～ 1 0 -3 μL量级的烃类气可以较好地测定其碳同位素 .应用这一技术 ,测量了吐哈盆地艾参 1井三叠系油砂层脱附气C1～C3 的碳同位素组成 ,其值分别为 :δ13 C1=- 5 5 1‰ ;δ13C2 =- 38 6‰和C3 =- 35‰ .根据吐哈盆地天然气和原油的地球化学特征 ,结合盆地的地质背景 ,认为该储层解吸气为该层原油受生物降解时形成的烃类气体被吸附于储层中 ,其油气源与盆地内二叠系 (可能含石碳系 )油源岩有关 ,与该区目前开发的侏罗系煤成油气有明显的差异 .近年该区油气勘探成果验证了这一认识
The emergence of the GC_C_MS (chromatographic combustion mass spectrometry) on-line analytical instrument and the development of this instrument have enabled the determination of carbon isotopes of hydrocarbon gases in the order of 1 0 -2 to 1 0 -3 μL. , The carbon isotopic compositions of C1 ~ C3 in the Triassic sand reservoirs of the Well Ai-1 in the Turpan-Hami Basin were measured and their values were: δ13C1-55-1 ‰, δ13C2 = -386 ‰ and C3 = - 35 ‰. According to the geochemical characteristics of natural gas and crude oil in the Turpan-Hami basin and the geological background of the basin, it is considered that the desorbed gas is the hydrocarbon gas formed when the layer of crude oil is biodegraded is adsorbed into the reservoir, The source of oil and gas is related to the Permian (possibly carboniferous) source rock in the basin, which is obviously different from the Jurassic coal gas developed in this area in recent years.