松辽盆地白垩系湖相Ⅰ型有机质生烃动力学

doi:10.11743/ogg20140106

摘要/Abstract

摘要： 针对松辽盆地白垩系湖相Ⅰ型有机质的生烃特征和动力学，利用黄金管模拟装置开展了升温热解实验。液态产物和气体产物的定量分析结果表明，该Ⅰ型有机质在热演化过程中以生油为主，干酪根初次裂解气产量仅为100 mg/g左右。轻质油的色谱演化和烃类气体生成的活化能分布共同证实，封闭体系的烃类气体来源于多种反应途径，其中早期生成液态产物的二次裂解作出了很重要的贡献。同时，动力学计算的结果表明，不同液态产物生成反应的动力学参数存在差异，轻质组分生成的活化能明显要高于重质组分；源内残留油二次裂解的平均活化能为57.3 kcal/mol，要低于油藏内正常原油裂解的活化能；Ⅰ型有机质初次裂解气形成于生油初期到源内残留烃裂解早期阶段。

关键词: 黄金管热解实验, Ⅰ型有机质, 动力学, 油气生成模式, 生烃潜力, 松辽盆地

Abstract: A pyrolysis experiment with gold-tube modeling apparatus was carried out to study the features and kinetics of hydrocarbon generation from the type-Ⅰ organic matters in the Cretaceous lacustrine sequences,Songliao Basin.Quantitative analysis of the liquid and gas products from the simulation experiment of type-Ⅰ organic matters indicates that oil is the dominant product and gas yield is limited with the maximum value from the primary cracking at 100 mg per gram of organic matter.The chromatograms of light oils and the activation energy distribution of hydrocarbon gas genereation collectively demonstrate that the hydrocarbon gas in confined system are generated from multiple reaction processes,wherein the secondary cracking of liquid hydrocarbons initially generated have a greater contribution.Meanwhile,kinetics calculation shows that the reaction kinetic parameters of different liquid hydrocarbons differ from one another;the activation energy of light components is obviously higher than that of the heavier ones;the average activation energy of secondary cracking of residual oil in source rocks was 57.3 kcal/mol,being lower than that in normal reservoirs;and the generation of primary cracked gas from the type-Ⅰ organic matters lasted from the initial stage of oil generation to the early cracking stage of residual oil within source rocks.

Key words: gold-tube pyrolysis experiment, type-Ⅰ organic matter, kinetics, oil and gas generation model, hydrocarbon generation potential, Songliao Basin

中图分类号:

TE122.1

何坤,张水昌,王晓梅,等. 松辽盆地白垩系湖相Ⅰ型有机质生烃动力学[J]. 石油与天然气地质, 2014, 35(1): 42-49. doi: 10.11743/ogg20140106 He Kun,Zhang Shuichang,Wang Xiaomei,et al. Hydrocarbon generation kinetics of type-Ⅰ organic matters in the Cretaceous lacustrine sequences, Songliao Basin[J]. Oil & Gas Geology, 2014, 35(1): 42-49. doi: 10.11743/ogg20140106

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