四川盆地上三叠统须家河组烃源岩埋藏史及热演化特征
Burial history and thermal evolution characteristics of source rocks of the Upper Triassic Xujiahe Formation, Sichuan Basin
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摘要: 根据地层分层数据和古热流分析，运用PetroMod-1D软件对四川盆地的51口探井进行模拟，得到了盆地内上三叠统的埋藏史、成熟度演化史及烃源岩受热史，初步划分了上三叠统烃源岩的成熟阶段和生烃期次。结果表明，川北、川中地区须家河组烃源岩分别在中晚侏罗世进入生烃门限；川南地区大约在早白垩世达到生烃门限，此后地层不断埋深，热演化持续进行，在晚白垩世达到最大埋深，之后由于燕山末期及喜山期构造运动，地层发生整体抬升，干酪根的热演化也因此受到了遏制。Abstract: According to the geologial data and the present geothermal and paleogeothermal data from 52 exploration wells, the authors analyzed the changes of burial history，maturity evolution and thermal history, and gas generation with time of each well with PetroMod software. The results show that the Upper Triassic source rocks in northern and middle Sichuan basin came into the oil-generating window in middle and late Jurassic, respectively. However, the Upper Triassic source rocks in southern Sichuan basin entered into hydrocarbon generation threshold in Early Cretaceous. The source rocks continued to be buried at the greatest depth and then reached the oil-generating peak until the late stage of late Cretaceous. After that, Sichuan basin experienced a uplifting process as a whole under the late Yanshanian and Himalayan movements, while the thermal evolution of kerogen was ended eventually.
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Keywords:
- Upper Triassic /
- source rock /
- thermal history /
- basin simulation
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