Natural gas geology and exploration direction of the Cambrian Lower Canglangpu Member in central Sichuan paleo-uplift, Sichuan Basin, SW China

YAN Wei,LUO Bing,ZHOU Gang,CHEN Youlian,ZHONG Yuan,LI Kunyu,ZHOU Hongfei,ZHAO Like,HE Yuan

Table 2 Evaluation on favorable blocks in the Lower Member of Canglangpu Formation, Sichuan Basin.

Favorable block Hydrocarbon generation center of source rock Dolomite thickness/ m Reservoir origin Mudstone caprock in Upper Member of Canglangpu Fm Location at the Paleo- uplift during reservoir- forming period Area/ 104 km2 Elevation/m Evaluated class PT1-CS1 well block From Deyang- Anyue rift 25-40 Dolomite shoal+ karstification More than 50 m generally Slope 1.6 -8000- -4500 I HT1-GT2 well block From Deyan-Anyue rift and Hechuan- Dianjiang Sag 5-25 Dolomite shoal+weak karstification Thin on the whole Core 0.9 -6000- -4800 II East of Well GT2 From Hechuan- Dianjiang Sag 0-20 Dolomite shoal+weak karstification Thinner in the north and about 50 m thick in the south Slope 0.8 -7800- -4800 III