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利用生烃动力学方法对酒西盆地青西凹陷下白垩统湖相白云质和湖相泥质烃源岩进行定量评价。通过对干酪根在封闭体系下的热解模拟实验,研究了不同岩性烃源岩干酪根热解生烃演化特征,获得了干酪根的生烃动力学参数。湖相泥岩干酪根的指前因子比湖相碳酸盐岩的小,活化能主峰也较后者低。湖相泥岩样品生成甲烷的活化能分布范围为43~67 kcal/mol,湖相碳酸盐岩样品生成甲烷的活化能分布在51~74 kcal/mol之间。在此基础上,结合Kinetics软件,将此动力学参数应用于地质实际中,结果表明,青西凹陷湖相泥岩和湖相泥质白云岩生烃作用时间晚,大量生烃出现在16 Ma之后,主生烃期发生在2 Ma左右。
Quantitative evaluation of dolomitic and lacustrine mudstone source rocks of Lower Cretaceous in Qingxi sag of Jiuxi Depression using hydrocarbon generation kinetic method. Through the pyrolysis simulation experiments of kerogen in a closed system, the hydrocarbon evolution characteristics of kerogen from different lithology source rocks were studied, and the hydrocarbon generation kinetic parameters of kerogen were obtained. The pre-exponential factor of kerogen in lacustrine mudstone is smaller than that of lacustrine carbonate rock, and the main peak of activation energy is also lower than the latter. The activation energy distribution of methane produced by the lacustrine mudstone samples ranged from 43 kcal / mol to 67 kcal / mol, and that of lacustrine carbonate samples varied from 51 kcal / mol to 74 kcal / mol. Based on this, Kinetics software was used to apply this kinetic parameter to geologic practice. The results show that the hydrocarbon generation of lacustrine mudstone and lacustrine dolomite of late Qingxian Sag occurred later and the massive hydrocarbon generation occurred after 16 Ma, The main hydrocarbon generation period occurs at about 2 Ma.