Distribution Characteristics and Geochemical Significances of the Individual Hydrocarbon Sulfur Isotopes of Crude Oils in the Liaohe Western Depression

doi:10.19657/j.geoscience.1000-8527.2024.043

Abstract

Abstract:

The individual hydrocarbon sulfur isotopes in crude oil provides key geochemical information for determining oil maturity and depositional environment. The crude oils from the Liaohe Western Depression were analyzed using gas chromatography with multicollector inductively coupled plasma mass spectrometry (GC-MC-ICP MS), in conjunction with gas chromatography/mass spectrometry (GC-MS) technology. The δ³⁴S values of individual hydrocarbon in three genetically different crude oils show significant differences. The δ³⁴S value of freshwater mature oil from the Jinzhou oilfield (20.57‰) is the highest, and the individual hydrocarbon sulfur isotopes exhibit an initial increase followed by a decrease with increasing methylation degree. The δ³⁴S value of low mature oil from the Shuguang-Gaosheng oilfield in a saline environment (19.23‰) is slightly lower than the former, and the monomeric hydrocarbon sulfur isotopes increase with the degree of methylation. The δ³⁴S value of low mature oil from the Niuxintuo oilfield in a semi-saline environment (14.47‰) is the lowest. An increasing trend in δ³⁴S values with maturity is observed, and there is a good negative correlation between Δδ³⁴S_{1-mDBT-4-mDBT} and the maturity parameter C₂₉sterane ααα20S/(S+R), indicating the controlling role of maturity, which may be the primary factor affecting δ³⁴S values. The δ³⁴S values of crude oils with similar maturities show a good positive correlation with gamacerane/C₃₀ hopane and an inverse correlation with C₁₉/C₂₃ tricyclic terpane, indicating that a reducing saline environment promotes the sulfurization of organic matter, resulting in heavier δ³⁴S values. The mild biodegradation has a small impact on δ³⁴S values and does not cause obvious isotopic fractionation. Individual hydrocarbon sulfur isotopes serves as a reliable indicator for assessing crude oil maturity and depositional environments, offering a scientific foundation for hydrocarbon exploration and development.

Key words: Liaohe Western Depression, individual hydrocarbon sulfur isotope, thermal maturity, depositional environment, biodegradation

CLC Number:

P618.13
P597

DENG Shuo, LI Sumei, LIU Jia. Distribution Characteristics and Geochemical Significances of the Individual Hydrocarbon Sulfur Isotopes of Crude Oils in the Liaohe Western Depression[J]. Geoscience, 2025, 39(03): 801-813.

Figures/Tables 10

References 56

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井号	油田	层位	深度 (m)	密度 (g/cm³)	黏度 (mPa·s)	凝固点 (℃)	含蜡量 (%)	含硫量 (%)	饱和烃 (%)	芳烃 (%)	非烃+沥青质(%)	饱芳比
SG103	曙光	潜山	1786.80	0.82	3.73	32.00	14.99	-	72.70	15.70	11.60	4.63
S4-8-006	曙光	Es₄	1199.50	0.91	258.07	16.00	10.52	-	40.60	23.40	35.90	1.74
S3-06-03	曙光	Es₄	1307.35	0.88	120.00	24.00	15.44	-	51.70	25.20	23.10	2.05
S1-32-58C	曙光	Es₄	1093.05	0.93	1539.30	15.50	5.09	-	38.20	30.50	31.40	1.25
D84-38-172	曙光	Ng	654.00	1.00	664977.30	46.00	1.28	-	-	-	-	-
Z17-23	高升	Es₄中	1753.00	0.89	414.20	31.00	11.45	0.48	35.90	20.70	43.50	1.73
G3-6-0151	高升	Es₃下	1641.95	0.93	2585.00	9.00	-	0.51	24.00	19.60	56.40	1.22
G3-6-25	高升	Es₃下	1788.00	0.94	3524.00	6.00	5.10	0.53	27.50	21.10	51.40	1.30
T37-29	牛心坨	Es₄下	1909.55	0.88	1178.00	39.00	13.43	0.40	37.80	17.20	45.00	2.20
J2-8-10	锦州	Es₃	2483.90	0.80	2.47	9.00	19.57	-	72.60	15.00	12.40	4.84
J150-18-119	锦州	Mz	-	0.81	6.10	25.00	17.89	-	68.70	14.10	17.20	4.87

井号	油田	层位	深度 (m)	密度 (g/cm³)	黏度 (mPa·s)	凝固点 (℃)	含蜡量 (%)	含硫量 (%)	饱和烃 (%)	芳烃 (%)	非烃+沥青质(%)	饱芳比
SG103	曙光	潜山	1786.80	0.82	3.73	32.00	14.99	-	72.70	15.70	11.60	4.63
S4-8-006	曙光	Es₄	1199.50	0.91	258.07	16.00	10.52	-	40.60	23.40	35.90	1.74
S3-06-03	曙光	Es₄	1307.35	0.88	120.00	24.00	15.44	-	51.70	25.20	23.10	2.05
S1-32-58C	曙光	Es₄	1093.05	0.93	1539.30	15.50	5.09	-	38.20	30.50	31.40	1.25
D84-38-172	曙光	Ng	654.00	1.00	664977.30	46.00	1.28	-	-	-	-	-
Z17-23	高升	Es₄中	1753.00	0.89	414.20	31.00	11.45	0.48	35.90	20.70	43.50	1.73
G3-6-0151	高升	Es₃下	1641.95	0.93	2585.00	9.00	-	0.51	24.00	19.60	56.40	1.22
G3-6-25	高升	Es₃下	1788.00	0.94	3524.00	6.00	5.10	0.53	27.50	21.10	51.40	1.30
T37-29	牛心坨	Es₄下	1909.55	0.88	1178.00	39.00	13.43	0.40	37.80	17.20	45.00	2.20
J2-8-10	锦州	Es₃	2483.90	0.80	2.47	9.00	19.57	-	72.60	15.00	12.40	4.84
J150-18-119	锦州	Mz	-	0.81	6.10	25.00	17.89	-	68.70	14.10	17.20	4.87

井号	油田	Pr/ Ph	Pr/ nC₁₇	Ph/ nC₁₈	G/ C₃₀H	C₃₅/ C₃₄H	C₁₉/ C₂₃TT	C₂₉/ C₃₀H	S/R	αββ	C₂₉Ts/ C₃₀H	Ts/ (Ts+Tm)	DBT/P
SG103	曙光	0.56	0.31	0.63	0.40	0.56	0.16	0.33	0.39	0.35	0.05	0.27	0.06
S4-8-006	曙光	0.47	1.46	4.48	0.33	0.66	0.14	0.27	0.35	0.28	0.04	0.25	0.06
S3-06-03	曙光	0.53	1.12	2.92	0.33	0.68	0.12	0.29	0.36	0.30	0.04	0.28	0.06
S1-32-58C	曙光	0.45	1.53	4.52	0.32	0.65	0.16	0.26	0.32	0.27	0.04	0.26	0.09
D84-38-172	曙光	0.55	0.47	0.72	0.24	0.34	0.14	0.39	0.32	0.43	0.39	0.42	0.09
Z17-23	高升	0.68	1.00	2.35	0.41	0.71	0.13	0.44	0.22	0.22	0.05	0.19	0.13
G3-6-0151	高升	0.50	5.22	18.77	0.25	0.71	0.14	0.29	0.29	0.28	0.03	0.19	0.06
G3-6-25	高升	0.50	5.22	24.29	0.25	0.62	0.13	0.29	0.31	0.27	0.03	0.19	0.06
T37-29	牛心坨	0.78	1.22	1.98	0.18	0.65	0.42	0.35	0.23	0.21	0.07	0.23	0.13
J2-8-10	锦州	1.42	0.39	0.28	0.04	0.60	0.41	0.36	0.52	0.40	0.18	0.62	0.09
J150-18-119	锦州	1.00	0.19	0.20	0.12	0.58	0.31	0.42	0.49	0.53	0.23	0.70	0.16

井号	油田	Pr/ Ph	Pr/ nC₁₇	Ph/ nC₁₈	G/ C₃₀H	C₃₅/ C₃₄H	C₁₉/ C₂₃TT	C₂₉/ C₃₀H	S/R	αββ	C₂₉Ts/ C₃₀H	Ts/ (Ts+Tm)	DBT/P
SG103	曙光	0.56	0.31	0.63	0.40	0.56	0.16	0.33	0.39	0.35	0.05	0.27	0.06
S4-8-006	曙光	0.47	1.46	4.48	0.33	0.66	0.14	0.27	0.35	0.28	0.04	0.25	0.06
S3-06-03	曙光	0.53	1.12	2.92	0.33	0.68	0.12	0.29	0.36	0.30	0.04	0.28	0.06
S1-32-58C	曙光	0.45	1.53	4.52	0.32	0.65	0.16	0.26	0.32	0.27	0.04	0.26	0.09
D84-38-172	曙光	0.55	0.47	0.72	0.24	0.34	0.14	0.39	0.32	0.43	0.39	0.42	0.09
Z17-23	高升	0.68	1.00	2.35	0.41	0.71	0.13	0.44	0.22	0.22	0.05	0.19	0.13
G3-6-0151	高升	0.50	5.22	18.77	0.25	0.71	0.14	0.29	0.29	0.28	0.03	0.19	0.06
G3-6-25	高升	0.50	5.22	24.29	0.25	0.62	0.13	0.29	0.31	0.27	0.03	0.19	0.06
T37-29	牛心坨	0.78	1.22	1.98	0.18	0.65	0.42	0.35	0.23	0.21	0.07	0.23	0.13
J2-8-10	锦州	1.42	0.39	0.28	0.04	0.60	0.41	0.36	0.52	0.40	0.18	0.62	0.09
J150-18-119	锦州	1.00	0.19	0.20	0.12	0.58	0.31	0.42	0.49	0.53	0.23	0.70	0.16