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对2种不同成因气或同源不同成熟阶段气的模拟实验表明:煤型气、油型气混源气随油型气比例降低,碳同位素组成逐渐变重,氢同位素组成变轻,各组分同位素分馏模式不同,具有三阶段变化模式;同源不同成熟阶段混源气随高熟气比例的增加,烷烃气碳同位素组成逐渐变重。建立了煤型气、油型气混源比例定量判识的地球化学模板,在雅克拉气田得到了很好地应用。雅克拉气田主要为油型气,掺混煤型气比例约为12%~20%。同时,建立了同源不同成熟阶段气混源比例定量判识的地球化学模板,在塔河油田应用效果很好。塔河油田天然气由高成熟气与低成熟气混合形成,塔河东部主要以高成熟天然气为主,西部以低成熟气为主,只是混合的比例不同,低成熟气与高成熟气的混源比例在1∶19~13.3∶1之间,天然气由东南向西北、由东向西运移充注。针对南方海相地层实际情况,对氩同位素积累效应确定气源岩时代模型进行了修正,并对大湾2井天然气来源进行了定量判识。
The simulation experiments on gas of two different provenances or gas at different stages of maturity show that with the decrease of oil gas ratio, the carbon isotope composition becomes heavier and the hydrogen isotope composition becomes lighter. Different sub-isotopic fractionation modes have a three-stage variation pattern. At different mature stages of homology, the carbon isotope composition of alkanes gradually becomes heavier with the increase of the proportion of high-grade gas. The geochemical template for quantitatively identifying the ratio of coal-type gas and oil-gas mixture has been established and has been well applied in the Yakela gas field. The Yakela gas field is mainly oil gas, and the proportion of blended coal gas is about 12% -20%. At the same time, a geochemical template for the quantitative identification of gas-oil ratio in different mature stages of the same source has been established, which has good effect in Tahe Oilfield. The natural gas in Tahe Oilfield is formed by the mixture of high-mature gas and low-mature gas. The eastern Tahe River is dominated by high-mature natural gas, while the western part is dominated by low-mature gas, with only different proportions of mixing. The mixed source of low-mature gas and high-mature gas The ratio of 1:19 to 13.3: 1, natural gas from southeast to northwest, from east to west migration charge. Aiming at the actual situation in southern marine strata, the model of gas source rock age was confirmed by the effect of argon isotope accumulation and the quantitative identification of natural gas in Dawan 2 well was made.