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

Jianping BAO,Cuishan ZHU,Zhifeng WANG

Fig. 11. Distributions of methyl triaromatic steroids in different marine crude oil samples from the Tarim (m/z 245; 2-m, 3-m and 4-m refer to C27-29 2-methyl, 3-methyl and 4-methyl triaromatic steranes; “?” —4, 23, 24-trimethyl triaromatic dinosteranes). (a) Well TZ11, 4301-4 307 m, S; (b) Well TD2, 4 561.93-5 040.00 m, ?C; (c) Well YM101, 5 912.5-5 917.0 m, O; (d) Well YM201, 5 844-5 888 m, O.