Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

Table 3

Parameters of mudstone seal in the Huizhou Sag [38].

Formation	Thickness (m)	Max thickness (m)	Average thickness of single layer (m)	Seal/stratum ratio (%)	Breakthrough pressure/Mpa
Hanjiang	46.0~700.0	13.0~91.0	4.3~34.0	18.0~87.0	0.2~1.5
Upper Zhujiang	72.0~638.0	34.0~121.0	2.0~52.0	27.6~86.0	0.4~30.0
Lower Zhujiang	16.0~120.0	7.0~41.0	3.0~16.0	8.5~76.0	1.0~30.0
Zhuhai	16.5~167.0	3.5~27.0	1.2~6.0	6.4~41.2	0.70~50.0
Enping	21.0~555.0	4.0~40.0	0.9~6.4	10.5~80.0	0.3~50.0
Wenchang	90.0~146.0	25.0~80.0	3.0~10.0	46.4~78.9	10.0~35.0