【作者】 殷秀兰； 李思田；

【Author】 YIN Xiu-lan, LI Si tianz(Institute of Geornechanics, CAGS, 13eijing 100081, China;China University of Geosciences, Wuhan 430074, China)

【机构】 中国地质科学院地质力学研究所； 中国地质大学；

【摘要】 驾歌海盆地独特的地质进程形成多套泥源层,泥源岩的压实与排液不均衡导致盆地内存在大规模的超压体系,大量的生烃及水热增压使盆地内超压进一步加剧。底辟作用将超压传递至浅层,使超压体系的分布在不同深度和不同构造带中的差异均较大。在中央底辟带,由于泥—流体底辟活动极强,突破的地层多,超压顶面埋深很浅;超压的释放不仅仅是孔隙流体的逸散,更重要的是烃源(主要是泥源层)所生成的油和气作为热流体的一部分,伴随热流体向上突破、运移到浅部分异、逸散和聚集形成气藏。更多还原

【Abstract】 The Unique geological evolution of the Yinggehai basin resulted in more than threesets of thick muddy deposits, subsequent compaction of the sediments and differential discharge of fluids from the pores led to the existence of large scale overpressure systems. Formation of large amount of hydrocarbons and high heat flow reinforced the overpressure.Diapirism made the overpressure propagate upwards. As a result, the overpressure systems were developed in the well-dinpired central part of the basin, where the top of the system rises to a depth of 2000-3 000m and slopes towards the margins. The episodic release of the overpressure may cause an upward migration of the oil and gas to shallow depth to accumulate into pools.更多还原