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

Jianping BAO,Cuishan ZHU,Zhifeng WANG

Fig. 8. 4-methyl sterane series in four crude oil samples (m/z 231; “?” = C28-30 4-methylsterane; “*” = C30 dinosteranes). (a) Well TZ11, 4301-4 307 m, S; (b) Well TZ30, 4 997-5 026 m, O; (c) Well YM201, 5 844-5 888 m, O; (d) Well YM101, 5 912.5-5 917.0 m, O.