THERMO-COMPRESSION CHARACTERISTICS OF HYDROCARBON GENERATION FOR THE SOURCE ROCKS IN THE FUNINGFORMATION OF SOUTH YELLOW SEA BASIN
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摘要:
通过生烃模拟获取生烃动力学参数是近年来油气资源评价工作中极为重要的一个环节，利用地层热压生排烃模拟装置对南黄海盆地南二凹陷阜四段烃源岩进行了生烃模拟实验，并拟合了生烃动力学参数。实验及研究结果表明，阜四段烃源岩的生烃演化可分为3个阶段：第1阶段产烃量随温度上升快速增大，以产油为主；第2阶段产烃量随温度上升缓慢增加，为油、气同产；第3阶段产烃量随温度上升快速增大，主要是以生气为主。实验拟合出阜四段烃源岩的生油活化能为228 kJ/mol，生气活化能为280 kJ/mol。与常压—完全开放体系试验、金管-高压釜实验装置的实验结果对比，本次实验南黄海盆地阜四段烃源岩在地层热压条件下出现生油窗滞后现象，烃源岩样品在高成熟演化阶段依然具有较高的液态烃产率。阜四段生油活化能值较高，其内在原因是有机质受到烃源岩孔隙中高压水的“保护”作用以及受生烃空间的影响，延缓了烃源岩的热演化进程。综合前人实验结果分析，有限空间热压生烃模拟实验环境更接近于烃源岩在地层条件下的生烃条件，实验结果对南黄海盆地的油气资源潜力评价及油气勘探方向具有指导意义。
Abstract:The kinetics data of hydrocarbon generation is very important to hydrocarbon resource evaluation. The source rock samples taken from the 4th Member of the Funing Formation in the Naner Sag of the South Yellow Sea Basin are used in this paper for thermo-compression simulation and fitting experiment of kinetic parameters for hydrocarbon generation. The results suggest that the generation of hydrocarbon in the 4th Member of the Funing Formation can be subdivided into three stages. In the first stage, hydrocarbon production dominated by oil increased rapidly with the rise of temperature. In the second stage, with the increase in temperature, hydrocarbon production including both oil and gas increased slowly. In the third stage, hydrocarbon production, dominated by gas, increased rapidly with the rise of temperature. The experimental results show that the activation energy for oil generation and gas generation is 228 kJ/mol and 280 kJ/mol, Respectively. Compared with the results from conventional experiment under open system and the gold tube autoclave test for the source rock samples of the Funing Formation, a lag phenomenon is noticed. The source rock samples still have high liquid hydrocarbon production in the highly matured stage. The activation energy value of the 4th Member of Funing Formation derived from this experiment is higher than that in the other two cases of experiment. It is believed that the evolution of organic matter is protected by the high pressure porewater and influenced by the hydrocarbon generation space, which caused the delay of the thermal evolution process of the source rock. Based on the comprehensive analysis of this experiment and previous experimental results, the experiment environment of the thermo-compression simulation for hydrocarbon generation in finite space is concluded, which is closer to the geological conditions for hydrocarbon generation, and results of this experiment are useful to oil and gas resource evaluation and exploration in the South Yellow Sea Basin
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