Deep-Buried Triassic Oil-Source Correlation in the Central Junggar Basin, NW China
Table 2
Molecular parameters of Triassic mudstone source rocks in the central Junggar Basin.
Well
Depth (m)
Fm.
Lithology
Type
-Alkanes1
Maximum -alkanes2
Pr/Ph3
Pr/C17
Ph/C18
OEP4
β-Carotane/maximum -alkane
(C21 + C22)/(C28 + C29)
/
SM 1
4180
T3b
Dark gray mudstone
N/A
C11–C35
C20
1.36
0.54
0.40
0.98
0.22
7.00
2.30
SM 1
4190
T3b
Dark gray mudstone
N/A
C11–C35
C20
1.33
0.61
0.43
1.00
0.27
4.11
1.68
SM 1
4200
T3b
Dark gray mudstone
N/A
C13–C35
C21
1.51
0.66
0.43
1.02
0.19
3.86
1.43
SM 1
4210
T3b
Dark gray mudstone
N/A
C11–C35
C21
1.00
0.55
0.53
1.01
0.41
3.44
1.37
SM 1
4218
T3b
Dark gray mudstone
N/A
C11–C35
C21
1.11
0.51
0.44
1.00
0.33
7.15
1.82
SM 1
4230
T3b
Dark gray mudstone
N/A
C11–C35
C21
1.04
0.53
0.42
1.00
0.38
5.63
1.36
SM 1
4324
T2k
Dark gray mudstone
N/A
C11–C35
C21
1.01
0.50
0.45
1.01
0.40
8.21
1.85
MS 1
5649.19
T2k
Sandstone extract
A
C9–C35
C17
1.30
0.44
0.38
1.06
0.19
2.75
1.72
MS 1
5796
T2k
Sandstone extract
A
C12–C35
C20
0.75
0.43
0.53
0.99
0.12
3.87
1.38
MS 1
5955
T1b
Sandstone extract
A
C14–C35
C19
0.88
0.41
0.40
1.00
0.08
4.66
1.68
MS 1
5981.48
T1b
Sandstone extract
A
C12–C35
C17
1.23
0.38
0.33
1.06
0.06
2.92
1.65
XY 1
4493
T1b
Crude oil
B
C10–C35
C17
0.98
0.70
0.80
1.09
0.62
2.45
2.18
XY 2
4325
T2k
Crude oil
B
C9–C35
C20
0.91
0.96
1.19
1.03
0.97
2.63
2.56
Da 1
4244
T2k
Crude oil
B
C9–C35
C15
1.11
0.78
0.76
0.98
0.47
2.62
3.42
SM 1
4508.2
T1b
Sandstone extract
B
C12–C35
C21
0.98
0.62
0.68
1.00
0.48
2.71
1.29
Note. Type of end-member oil; N/A, not applicable; 1, N-alkane distribution; 2, main peak (maximum concentration) of n-alkanes; 3, pristane/phytane; 4, calculated after Scalan and Smith [31], defined as , Ci is the relative weight percent of an n-alkane containing carbon atoms per molecule which has the maximum concentration in n-alkanes.
