大港探区深层异常孔隙成因机理

Formation Mechanism for Deep Abnormal Pores of Dagang Exploration Area

本文针对大港探区深层普遍发育的异常孔隙的成因机理进行了探讨性的研究。首次提出了受异常超压的影响,深层成岩演化序列发生改变:即深层伊蒙混层关系倒置;储集体内发育的异常孔隙(原生、次生)受烃类的早期注入、化学溶蚀和超压保存机制的共同控制等新观点、新认识,有效地指导了大港探区深层的勘探部署。

This paper explores the formation mechanism for deep generally-developed abnormal pores of Dagang exploration area. It has come up with some new conceptions for the first time, such as deep diagenesis sequence changes resulting from influence of geopressured abnormality, namely inversion of relation for illite/smectite mixed layer, developed abnormal pores (including primary and secondary pores) in reservoirs commonly controlled by early hydrocarbon injection, chemical corrosion and super-pressure preservation mechanism. The research can effectively help deep-layer exploration deployment in Dagang exploration area.