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Shahejie formation of Paleogene is the most important source rock in Huimin sag which is divided into sub-sags of l,innan, Zizheng, Yangxin, Lizezheng. 古近系沙河衡組是惠民凹陷最重要的生油層系，該凹陷主要由臨南、滋鎮(zhèn)、陽信、里則鎮(zhèn)等次級洼陷組成。