Kinetic Study of Marine and Lacustrine Shale Grains Using Rock-Eval Pyrolysis: Implications to Hydrocarbon Generation
Kinetic Study of Marine and Lacustrine Shale Grains Using Rock-Eval Pyrolysis: Implications to Hydrocarbon Generation
复制标题
利用岩石热解法研究海洋和湖泊页岩颗粒的动力学：对碳氢化合物生成的影响
DOI：
10.1016/j.marpetgeo.2017.01.009
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发表时间：
2018
影响因子：
4.2
通讯作者：
Yunpeng Wang
中科院分区：
文献类型：
--
作者：
Lingling Liao;Yunpeng Wang
利用岩溶热解技术反演了海相和湖相页岩颗粒(4 Mm)的动力学参数，并与同一样品的细粉(<；0.178 mm)和干酪根进行了对比。颗粒的测定结果与粉状和干酪根有显著差异。平凉海相页岩颗粒比粉末和干酪根具有较宽的活化能分布，而延长湖相页岩颗粒比粉末和干酪根具有更高的优势活化能。在实验室升温速率(5~25℃/min)下，与颗粒最大生烃速率对应的温度，海相页岩比粉末和干酪根分别高3~8℃，湖相页岩比干酪根高6~8℃。根据地质升温速率(3℃/My)推算，海相页岩和湖相页岩颗粒的最大排烃速率对应的成熟度和地质温度分别滞后于粉尘0.02Ro%和3℃，以及0.05Ro%和6℃。在生烃高峰后(Ro=0.1%)，海相页岩颗粒和粉粒的保留率分别达到7.33%和0.09%，而湖相页岩的颗粒和粉粒保留率分别达到16.50%和10.85%。这些结果表明，谷物具有较高的排出阈值和较高的保留能力。结果表明，与平凉海相页岩相比，延长湖相页岩具有较强的滞留能力和较弱的排烃能力。研究结果表明，颗粒热解为页岩剩余油气评价提供了一种新的方法，可以对页岩的生烃、排烃和滞留进行全面的研究。
The kinetic parameters of marine and lacustrine shale grains (4 mm) were retrieved by using Rock-Eval pyrolysis in comparison with finely ground powder (<0.178 mm) and kerogen of same samples. Results of grains show remarkable differences from powder and kerogen. Grains of Pingliang marine shale exhibit a relatively broader distribution of activation energies than powder and kerogen while grains of Yanchang lacustrine shale show higher dominant activation energies than powder and kerogen. At laboratory heating rates (5–25 °C/min), the corresponding temperatures to the maximum hydrocarbon generating rate of grains are 3–8 °C higher than powder and kerogen for marine shale and 6–8 °C higher for lacustrine shale, respectively. Extrapolated to geological heating rate (3 °C/my), the corresponding maturity and geological temperature to the maximum hydrocarbon expulsion rate of grains lags powder 0.02 Ro% and 3 °C, as well as 0.05 Ro% and 6 °C for marine shale and lacustrine shale, respectively. After the peak of hydrocarbon generation (Ro = 1%), the retention percentage for grain and powder of marine shale reach 7.33% and 0.09% while those for lacustrine shale reach 16.50% and 10.85%, respectively. These results suggest grains enjoy higher expulsion threshold and higher retention ability. The results suggest that Yanchang lacustrine shale exhibits stronger retention ability and weaker expulsion ability than Pingliang marine shale. The results presented in this study show that grain-based pyrolysis provides a novel method for evaluating the residual oil and gases for shale, which can study the hydrocarbon generation, expulsion and retention comprehensively.