渤海湾盆地渤中19-6凝析气田天然气成因及油气成因关系判识

doi:10.11743/ogg20200502

Abstract

Abstract:

The genesis of natural gas in the Bozhong 19-6 gas condensate field in the Bohai Bay Basin is analyzed by means of petroleum geochemical analyses, and the genetic relationship between condensate and natural gas is thereby determined.The results show that the natural gas in the Bozhong 19-6 gas condensate field is mainly composed of wet hydrocarbon gases with relatively low C₁/(C₂+C₃) values ranging from 6.4 to 7.3, and carbon isotope values of methane and ethane ranging from -38.0‰ to -39.0‰ and from -25.4‰ to -27.0‰, respectively, indicating humic-prone kerogene-cracked gases probably derived from the source rocks of the third member of the Shahejie Formation.A number of condensate and gas maturity parameters show that both condensate and natural gas from the field are mature, with natural gas slightly maturer than condensate.Geological evidences also reveal that the field went through a hydrocarbon accumulation process of "early oil and late gas", with the main condensate accumulation stages (since 12 Ma) prior to those of natural gas (since 5 Ma).

Key words: maturity, gas-source correlation, condensate, natural gas, Bozhong 19-6 gas condensate field, Bohai Bay Basin

CLC Number:

TE122.1

Anwen Hu, Deying Wang, Haibo Yu, Tao Jiang, Zhe Sun. Genesis of natural gas and genetic relationship between the gas and associated condensate in Bozhong 19-6 gas condensate field, Bohai Bay Basin[J]. Oil & Gas Geology, 2020, 41(5): 903-912, 984.

Figures/Tables 15

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井号	深度/m	层位	天然气组分含量(体积百分数)/%								干燥系数 (C₁/C₁₊)
井号	深度/m	层位	C₁	C₂	C₃	C₄	C₅	C₆₊	N₂	CO₂	干燥系数 (C₁/C₁₊)
J1	3 566.8~3 634.0	古近系孔店组	76.75	8.68	2.98	1.35	0.54	0.20	0.13	9.37	0.85
J1	4 043.4~4 142.0	太古宇	70.85	8.04	2.82	1.30	0.46	0.11	0.15	16.27	0.85
J2	3 873.7~3 923.5	太古宇	78.27	8.19	2.59	1.07	0.32	0.10	0.11	9.35	0.86
J2	3 879.0~3 998.7	太古宇	77.78	8.22	2.78	1.28	0.49	0.16	0.12	9.19	0.86
J4	4 411.0~4 499.8	太古宇	75.41	8.83	3.01	1.36	0.54	0.17	0.19	10.49	0.84
J5	3 500.0~3 566.0	古近系孔店组	77.40	8.21	2.95	1.38	0.60	0.31	0	9.15	0.85

井号	深度/m	层位	密度/(g·cm^-3)	粘度/(mPa·s)	含蜡量/%	胶质含量/%	沥青质含量/%	凝固点/℃	主峰碳	∑C_21-/∑C₂₂₊
J1	3 566.8~3 634.0	古近系孔店组	0.795	1.42	13.95	0.76	0.31	22	19	1.05
J1	4 043.4~4 142.0	太古宇	0.793	1.24	11.80	0.84	0.15	12	19	1.01
J2	3 873.7~3 923.5	太古宇	0.799	1.54	15.04	0.41	0.28	17	16	2.05
J2	3 879.0~3 998.7	太古宇	0.809	2.14	13.84	1.28	0.14	22	15	2.37
J2	4 261.0	太古宇	0.811	2.44	17.79	1.40	0.25	20	15	2.29
J3	4 079.2	古近系孔店组	0.787	2.06	7.32	0.57	0.02	11	15	1.81
J4	4 411.0~4 499.8	太古宇	0.798	1.65	18.25	0.57	0.22	22	19	0.99
J5	3 500.0~3 566.0	古近系孔店组	0.791		10.52	0.96	0.74	16	17	1.49
平均值			0.798	1.78	13.56	0.85	0.26	18	17	1.63

井号	深度/m	层位	轻烃成熟度参数				芳烃成熟度参数
井号	深度/m	层位	2, 4-DMC₅/2, 3-DMC₅	T/℃	石蜡指数	烷-芳指数	MPI₁	MPI₂	4, 6-DMDBT/1, 4-DMDBT	2, 4-DMDBT/1, 4-DMDBT	R_c1	R_c2
J1	3 566.8~3 634.0	古近系孔店组	0.38	125.5	1.8	18.9	2.1	2.3	—	—	—	—
J1	4 043.4~4 142.0	太古宇	0.24	118.8	1.7	21.1	2.2	3.1	—	—	—	—
J2	4 261.0	太古宇	—	—	—	—	1.2	1.3	3.1	1.8	1.0	1.1
J3	4 079.2	古近系孔店组	—	—	—	—	1.4	1.5	2.8	1.8	1.0	1.1
J4	4 411.0~4 499.8	太古宇	—	—	—	—	2.5	2.9	3.7	2.1	1.0	1.2
J5	3 500.0~3 566.0	古近系孔店组	—	—	—	—	1.9	2.3	2.2	1.6	0.9	1.0

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Genesis of natural gas and genetic relationship between the gas and associated condensate in Bozhong 19-6 gas condensate field, Bohai Bay Basin

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