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Kinetics of the hydrocarbon generation process of marine source rocks in South China

机译：中国南方海相烃源岩生烃动力学

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摘要

The kinetics of hydrocarbon generation of different types of marine source rocks and planktonic algae in South China were analyzed using the Rock-Eval 6 instrument and the Optkin kinetic software. The average activity energy of marine source rocks has the characteristics ofEAIΔEII2>ΔEII1>ΔEI, the hydrocarbon generation speed isVmI>VmII1>VmII2>VmIII, while the planktonic algae has a very low activation energy for hydrocarbon generation and can generate a great abundance of heavy oil during the immature –low mature period. According to the results of kinetic experiments on thermal simulation experiments and simulation residue samples, the kinetic hydrocarbon generation process of marine source rocks can be described by four stages: (1) heavy oil generation, where the vitrinite reflectance (Ro) is 0.3%–0.6%, and the average activation energy is about 220 kJ/mol; (2) normal oil generation, where the vitrinite reflectance is 0.6%–1.2%, and the average activation energy is approximately 250–270 kJ/mol; (3) condensate and gas generation, where the vitrinite reflectance is higher than 1.2% and the average activation energy is higher than 270 kJ/mol; and (4) gas “dead line” of kerogen, where the vitrinite reflectance is higher than 4.21% and the average activation energy is higher than 320 kJ/mol.
机译：利用Rock-Eval 6仪器和Optkin动力学软件分析了华南地区不同类型的烃源岩和浮游藻类的生烃动力学。海洋烃源岩的平均活度能量在有效生烃期具有EAI ΔEII2>ΔEII1>ΔEI，碳氢化合物产生速度为VmI> VmII1> VmII2> VmIII，而浮游藻类的碳氢化合物活化能非常低，可以产生大量未成熟-低成熟期的大量重油。根据热模拟实验和模拟残留样品的动力学实验结果，可以通过四个阶段来描述海洋烃源岩的动力学烃生成过程：（1）重油生成，其中镜质体反射率（Ro）为0.3％– 0.6％，平均活化能约为220kJ / mol; （2）正常产油，其镜质体反射率为0.6％-1.2％，平均活化能约为250-270 kJ / mol; （3）凝析气产生，镜质体反射率大于1.2％，平均活化能大于270kJ / mol; （4）干酪根的气体“死线”，其镜质体反射率高于4.21％，平均活化能高于320 kJ / mol。

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