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阿克1气藏是塔西南前陆区喀什凹陷油气勘探上获得重大突破的工业性气藏。采用金管封闭体系热模拟实验和GC-IRMS碳同位素测定,结合运用GOR-ISOTOPEKINETICS专用软件,推导出了塔西南前陆区烃源岩(煤和泥岩)热解生成甲烷的碳同位素动力学参数。该区侏罗系煤、侏罗系泥岩和二叠系泥岩的平均活化能分别为225.86kJ/mol、194.03kJ/mol和223.45kJ/mol,甲烷(12CH4)的指前因子各为1.00×1014s-1、1.00×1013s-1、1.00×1014s-1。在此基础上,利用碳同位素动力学计算结果,并结合地质背景,进一步探讨了阿克1气藏天然气的来源,为天然气定量评价提供了新思路。阿克1气藏天然气为烃源岩过成熟阶段的烃产物,属于混源气,主要捕获了Ro为2.0%～3.6%阶段的天然气;其气源区包括喀什凹陷中心和阿克1井推覆体下盘,主力气源岩是石炭系烃源岩。
The aq 1 gas reservoir is an industrial gas reservoir that has made a major breakthrough in oil and gas exploration in the Kashi Sag in the foreland area in the southwest of the tower. The kinetic parameters of carbon isotope of methane from pyrolysis of source rocks (coal and mudstone) in the foreland of the southwestern Paleogene were deduced by thermal simulation of gold tube closed system and carbon isotope determination by GC-IRMS combined with GOR-ISOTOPEKINETICS special software. The average activation energies of Jurassic coal, Jurassic mudstone and Permian mudstone in this area are 225.86kJ / mol, 194.03kJ / mol and 223.45kJ / mol, respectively. The pre-exponential factors for methane (12CH4) are 1.00 × 1014s -1, 1.00 × 1013s-1, 1.00 × 1014s-1. Based on this, the carbon isotope kinetics calculation results and the geological background are used to further explore the source of natural gas in the Aq 1 gas reservoir, which provides a new idea for the quantitative evaluation of natural gas. The gas from Ake-1 gas reservoir is the over-matured hydrocarbon product of source rock. It belongs to mixed gas and mainly captures the natural gas with Ro of 2.0% to 3.6%. The gas source area includes Kashi depression center and Ake-1 well push Overhang under the plate, the main source rock is Carboniferous source rock.