车镇凹陷套尔河洼陷古地层压力演化与油气幕式成藏

Palaeoˉformation pressure evolution and episodic hydrocarbon accumulation in Tao’erhe Depression，Chezhen Sag

曾治平 郝芳 宋国奇 隋风贵

ZENG Zhi-Ping HAO Fang SONG Guo-Qi SUI Feng-Gui-

济阳坳陷车镇凹陷套尔河洼陷普遍发育异常高压，且异常高压的演化与油气生成、运移、聚集具有内在的联系。通过古地层压力恢复确定地史时期地层压力的演化规律，对比有机质热演化阶段的划分，能有效地确定地层压力演化不同阶段与油气生成、运移和聚集的阶段性，最终确定地层流体在不同压力演化阶段的流动样式。车镇凹陷地层压力演化存在两期超压积累-释放过程，早期超压积累过程形成的微裂缝是烃类初次运移的主要通道;晚期超压积累过程形成的次生孔隙和微裂缝是烃类大量运移的二次运移通道和集聚空间。

In Tao’erhe Depression，abnormally high pressure is generally developed and its evolution is inherently connected with hydrocarbon generation，migration and accumulation. The various periods of formation pressure evolution and the episodic hydrocarbon generation，migration and accumulation can be effectively determined by restoring paleo formation pressures and making a comparison among divisions of thermal evolution stages of organic matter. The flow patterns of formation fluids are identified in the different periods of pressure evolution. In Chezhen Sag，there were2processes of overpressure accumulation and release during the formation pressure evolution，with the microfractures formed during the early overpressure accumulation becoming the main pathway for primary hydrocarbon migration. The secondary pores and microfratures formed during the late overpressure accumulation can serve as the pathway for great secondary hydrocarbon migration and the space for hydrocarbon accumulation.

10.11743/ogg20100209