Typical end-member oil derived from Cambrian-Lower Ordovician source rocks in the Tarim Basin, NW China

Jianping BAO,Cuishan ZHU,Zhifeng WANG

Table 4 Compositions of C27-29 steranes and C26-28 triaromatic steranes in different marine oil samples from the Tarim Basin.

Well Depth/m Age C26-28 triaromatic steranes C27-29 steranes C26/C28 C27/C28 C27/C29 C28/C29 YM101 5 912.50-5 917.00 O 0.03 0.21 0.55 0.47 YM201 5 844.00-5 888.00 O 0.04 0.21 0.68 0.39 TZ11 4 301.00-4 307.00 S 0.05 0.23 0.33 0.58 TZ30 4 997.00-5 026.00 O 0.06 0.36 0.38 0.62 TD2 4 561.93-5 040.00 ?C 0.21 0.73 0.55 0.67