关键词: 珠江口盆地, 断层, 圈闭, 封堵能力, 影响因素, 构造成藏

Abstract: Three groups of faults in north-west,east-west and north-east directions were generated in the Pearl River Mouth Basin under the extending stress in the south-east to south-north trending.The faults are almost the normal faults,and the positive and negative normal faults are coexistence.The sealing capacity of the faults is decided by the difference between threshold pressure and the displacement pressure of hydrocarbon.The different faults have the different effect on the fluid migration,and the same fault as a pathway for hydrocarbon migration at the different time has different capability.It is generally considered that the active fault is open and the stable fault is close.The analyses on the characteristics and the influencing factors for the fault sealing,and the study of stress,inner structure,deformation mechanism of the faults show that the content of clay is the key factor controlling the fault trap with hydrocarbon accumulation.At the same time,fault throw,fault trend,obliquity,activity time and subsequent small fault are also the affecting factors for fault traps in the Pearl River Mouth Basin.

Key words: Pearl River Mouth Basin, fault, trap, sealing capacity, influencing factor, tectonic reservoir