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吐哈盆地天然气探明近千亿方,主要气源岩层为中下侏罗统水西沟群煤系地层,气源岩主要生排气时地相应热演化标尺R0=0.6%-0.9%,天然气甲烷碳同位素主峰群为-44‰--39‰(相应R0=0.6%-0.8%),乙烷碳同位素主峰群为-29‰--26‰之间,属于煤型低熟气,通过对吐哈盆地天然气地化特征分析确定天然气成因类型,建立盆地低熟气判识指标;通过盆地模拟计算了盆地低熟天然气资源量;通过天然气成藏过程分析建立模盆地低熟气成藏模式。
The proven natural gas in the Turpan-Hami Basin has nearly 100 billion cubic meters. The main gas source rock is the coal measure strata of the Middle-Lower Jurassic Shui Xigou Group. The corresponding thermal evolution scale R0 = 0.6% -0.9% The main peak carbon isotope composition of natural gas is -44 ‰ - 39 ‰ (corresponding to R0 = 0.6% -0.8%), and the main peak group of ethane carbon isotope is -29 ‰ -26 ‰, Based on the analysis of geochemical characteristics of natural gas in Turpan-Hami basin, the type of gas genesis is determined and the criteria for low-gassy gas formation in the basin are established. The amount of low-matured natural gas resources in the basin is calculated through basin modeling. .