Inclusion Data Analysis for the Determination of Oil Source and Accumulation Stages in Lucaogou Formation in the Chaiwopu Sag, Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2021.194

Abstract

Abstract:

Hydrocarbon accumulation in the Chaiwopu Sag has been well documented, however the tectonic and sedimentary evolution in the Chaiwopu Sag is complex, and the source of oil and the timing of hydrocarbon accumulation are still controversial. Here, the hydrocarbon source and accumulation of the Lucaogou Formation is discussed through an improved molecular composition of inclusion method, and the fluid inclusions in the Chaiwopu Sag (Junggar Basin). Distribution characteristics of the n-alkanes are dominated by low carbon numbers, and the relative abundance of C₂₁-tricyclic terpane and C₂₇-steranes are higher in the early-charging oil, showing blue fluorescence. The first stage (Early Cretaceous) oil came mainly from the Lucaogou Formation (semi-)deep lacustrine-facies source rocks in the north. Meanwhile, distribution characteristics of the n-alkanes are dominated by high carbon numbers, and the relative abundance of C₂₀-tricyclic terpane or C₂₃-tricyclic terpane and C₂₉-steranes are higher in the second-charging oil, showing yellow-green or yellow fluorescence. The second stage lasted from the end Late Cretaceous to the Early Paleocene, and the oil came mainly from the local Lucaogou Formation shore-shallow lacustrine-facies source rocks.

Key words: Chaiwopu Sag, inclusion molecular composition, hydrocarbon source, hydrocarbon accumulation period, hydrocarbon accumulation process

CLC Number:

TE122

ZHENG Ruihui, JIN Xiao, ZHENG Duo, LI Jiayang, CHEN Xue, ZHANG Zhihuan. Inclusion Data Analysis for the Determination of Oil Source and Accumulation Stages in Lucaogou Formation in the Chaiwopu Sag, Junggar Basin[J]. Geoscience, 2022, 36(04): 998-1008.

Figures/Tables 9

Fig.1 Distribution of structure units and sampling wells (a), and seismic interpretation of A-A' section (b) in the Chaiwopu Sag, Junggar Basin

Table 1 Samples for molecular composition of inclusion analysis in the central thrust-fold belt of Dabancheng Subsag, Chaiwopu Sag

编号	井号	层位	深度/m	类型
C-1	柴参1侧	P₂l	3 025.00	砂砾岩
C-3	柴参1侧	P₂l	3 054.65	砂砾岩
C-4	柴参1侧	P₂l	3 562.00	砂砾岩
D-1	达1井	P₂l	2 639.13	砂砾岩

Fig.2 Distribution characteristics of crude oil biomarkers in the Lucaogou Formation reservoir of the central thrust-fold belt, Chaiwopu Sag

Fig.3 Distribution characteristics of crude oil biomarkers in the inclusions from the Lucaogou Formation reservoir, the central thrust-fold belt, Chaiwopu Sag

Table 2 Distribution characteristics of biomarker parameters of crude oil and hydrocarbon inclusions from the Lucaogou Formation reservoir, the central thrust-fold belt,Chaiwopu Sag

类型	储层孔隙油样					包裹体油样
	柴参1侧		达1			柴参1侧						达1
	3 054.65 m	3 562.00 m	2 639.13 m	2 960.20 m		3 025.00 m		3 054.65 m		3 562.00 m		2 639.13 m
Pr/Ph	0.64	0.74	0.54	0.96	0.46		0.52		0.46		0.33
G/C₃₀H	0.19	0.22	0.18	0.28	0.22		0.27		0.39		0.23
C₂₄TE/C₂₆TT	0.44	0.44	0.39	0.52	0.74		0.67		0.71		0.80
Ts/Tm	0.61	0.76	0.77	0.57	0.97		0.89		0.99		0.85
Ts/(Ts+Tm)	0.38	0.43	0.43	0.47	0.55		0.57		0.59		0.51
C₂₇/C_27-29ST	0.26	0.26	0.29	0.20	0.45		0.48		0.48		0.50
C₂₈/C_27-29ST	0.37	0.31	0.32	0.41	0.24		0.24		0.25		0.24
C₂₉/C_27-29ST	0.37	0.43	0.40	0.39	0.31		0.28		0.27		0.26
C₂₉DH/C₂₉H	0.23	0.31	0.30	0.31	0.10		0.21		0.16		0.22
C₂₃TT/(C₂₃TT+C₃₀H)	0.59	0.58	0.52	0.53	0.61		0.68		0.75		0.75

Fig.4 Total-ion chromatograms (TIC), terpanes (m/z = 191) and steranes (m/z = 217) of the saturated hydrocarbons from the Lucaogou Formation, the central thrust-fold belt of the Chaiwopu Sag

Fig.5 Biomarker parameters of petroleum trapped in the petroleum inclusions and reservoirs and source rock of the Lucaogou Formation, Chaiwopu Sag

Fig.6 Microphotographs of inclusions of well Da 1 in the central thrust-fold belt of the Dabancheng subsag,Chaiwopu Sag

Fig.7 Reconstructed thermal and burial history and the hydrocarbon accumulation timing of well Da 1 in the Chaiwopu Sag

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