Geochemical significances of 8,14-secohopanes in marine crude oils from the Tazhong area in the Tarim Basin, NW China
BAO Jianping,YANG Xi,ZHU Cuishan
Table 1 Biomarker parameters and origin of crude oil samples from the Tazhong uplift.
Well No. Depth/m Age Pr/Ph Pr/nC17 Ph/nC18 Ts/Tm G/C31H C27R/
C29R		 C28R/
C29R		 C29 20S/
(20S+20R)		 C29 ββ/
(αα+ββ)		 C23T/
C30H		 C28NH/
C29H		 C29NH/
C30H		 Oil type
TZ11 4 301.00-
4 307.00		 S 1.22 0.43 0.49 0.41 0.91 0.43 0.71 0.46 0.41 0.08 / / Type-A
TZ30 4 997.00-
5 026.00		 O 1.37 0.32 0.31 0.39 1.04 0.43 0.73 0.45 0.40 0.02 / / Type-A
TZ10 4 227.00-
4 234.00		 C 1.11 0.31 0.33 0.62 0.12 0.51 0.26 0.50 0.56 0.88 / / Type-B
TZ35 4 946.00-
4 951.00		 S 1.33 0.40 0.37 0.81 0.09 0.64 0.37 0.49 0.54 0.28 / / Type-B
TZ35 4 320.00-
4 323.00		 C3 1.19 0.34 0.34 0.78 0.13 0.59 0.35 0.49 0.54 0.41 / / Type-B
TZ111 4 357.50-
4 364.00		 S 1.13 0.39 0.43 0.57 0.12 0.63 0.27 0.49 0.56 1.01 / / Type-B
TZ113 4 525.35-
4 671.42		 S 1.10 0.38 0.41 0.64 0.13 0.72 0.27 0.50 0.55 0.85 / / Type-B
TZ117 4 288.29-
4 304.17		 S 1.09 0.44 0.50 0.49 0.07 0.65 0.29 0.51 0.56 1.45 / / Type-B
TZ40 4 334.00-
4 340.00		 C3 1.14 0.34 0.34 0.90 0.08 0.66 0.24 0.46 0.57 1.17 / / Type-B
TZ47 4 390.50-
4 402.00		 C3 1.15 0.31 0.31 0.93 0.09 0.62 0.31 0.52 0.58 1.04 / / Type-B
TZ401 4 408.50-
4 980.50		 C3 1.15 0.33 0.34 0.90 0.07 0.72 0.26 0.49 0.57 1.16 / / Type-B
TZ6 3 647.00-
3 652.50		 C 1.57 0.60 0.66 0.40 0.35 0.45 0.58 0.44 0.38 0.20 0.10 0.05 Type A mixed oil
TZ621 4 851.10-
4 885.00		 O2+3 2.07 0.21 0.11 1.11 0.34 0.92 0.67 0.48 0.41 0.06 0.35 0.12 Type A mixed oil
TZ70 4 735.00-
4 770.00		 O 1.16 0.30 0.30 0.66 0.38 0.67 0.62 0.43 0.44 0.21 0.19 0.08 Type A mixed oil
TZ828 5 595.00-
5 603.00		 O 1.16 0.31 0.31 1.11 0.47 0.72 0.59 0.45 0.47 0.24 0.20 0.08 Type A mixed oil
TZ85 6 313.00-
6 550.00		 O 1.13 0.44 0.46 0.61 0.35 0.45 0.55 0.52 0.51 0.13 0.14 0.09 Type A mixed oil
TZ24 3 790.87-
3 807.21		 C3 1.24 0.32 0.30 0.41 0.42 0.35 0.62 0.51 0.53 0.50 0.38 0.10 Type A mixed oil
TZ54 5 747.00-
5 764.00		 O 1.34 0.34 0.29 0.80 0.56 0.68 0.58 0.45 0.41 0.13 0.09 0.03 Type A mixed oil
TZ62 4 052.98-
4 073.58		 S 1.37 0.52 0.40 0.55 0.48 0.74 0.70 0.51 0.46 0.88 0.17 0.10 Type A mixed oil
TZ74 4 683.40-
4 699.05		 O 1.15 0.25 0.24 1.03 0.70 0.76 0.60 0.47 0.41 0.09 0.42 0.14 Type A mixed oil
TZ44 4 854.00-
4 877.00		 O 1.17 0.28 0.27 0.52 0.35 0.48 0.69 0.49 0.50 0.46 0.10 0.06 Type A mixed oil
TZ401 3 244.00-
3 308.00		 C1 1.30 0.32 0.29 0.84 0.13 0.62 0.24 0.50 0.56 1.81 0.41 0.16 Type B mixed oil
TZ401 3 685.00-
3 703.00		 C 1.23 0.32 0.30 0.96 0.14 0.89 0.24 0.49 0.58 1.74 0.53 0.16 Type B mixed oil
TZ402 3 246.00-
3 280.00		 C1 1.29 0.33 0.30 0.80 0.12 0.52 0.26 0.48 0.56 1.72 0.41 0.16 Type B mixed oil
TZ404 3 619.47-
3 681.81		 C 1.33 0.31 0.28 0.82 0.14 0.61 0.26 0.50 0.57 1.56 0.44 0.18 Type B mixed oil
TZ421 3 570.50-
3 575.00		 C3 1.30 0.37 0.34 0.83 0.19 0.81 0.28 0.50 0.58 1.92 0.51 0.18 Type B mixed oil
TZ122 4 631.88-
4 733.92		 O 1.21 0.33 0.32 0.87 0.12 0.99 0.26 0.52 0.57 1.26 0.94 0.22 Type B mixed oil
TZ4 3 532.00-
3 548.00		 C2 1.36 0.36 0.33 0.82 0.16 0.50 0.22 0.45 0.51 2.32 0.42 0.13 Type B mixed oil
TZ169 4 241.09-
4 283.52		 O 1.11 0.43 0.44 0.97 0.13 0.82 0.32 0.53 0.59 1.07 0.22 0.09 Type B mixed oil
TZ75 3 701.00-
3 715.00		 C 1.26 0.32 0.29 0.83 0.16 0.81 0.32 0.54 0.57 1.96 0.53 0.20 Type B mixed oil