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

Figure 5

Organic constituent (a) and P-A-E ternary diagrams of Wenchang source rocks (b) and Enping source rock (c) (P: higher terrestrial plant; A: amorphous organic matter and alginite; E: exinite and sporonin). Data according to the internal reports of Shenzhen Company of CNOOC China Ltd.

(a) Various organic matters observed under the microscope in the Wenchang and Enping source rocks

(b) Depositional environment of the Wenchang formation

(c) Depositional environment of the Enping formation