渤海湾盆地黄骅坳陷板桥凹陷深层低渗透(致密)砂岩气藏充注特征及成藏过程

doi:10.11743/ogg20200503

Abstract

Abstract:

A large number of deep low-permeability (tight) sand gas reservoirs are discovered in the Bohai Bay Basin, but the systematic investigation of hydrocarbon charging mechanism and accumulation process related to those reservoirs is rarely seen.The study investigates the Banqiao Sag by analyzing genetic affinities among gas samples at first, and then the relationship between the charging path, dynamics and resistance, as well as discussing the charging patterns by using a series of data, including logging, core observation, seismic surveys, tests and analyses.Meanwhile, combined with the systematic test and analysis of fluid inclusions, the charging characteristics and accumulation process of deep low-permeability (tight) sand gas in Banqiao Sag are discussed.The results show that gases in the study area are primarily a mixture of condensate oil associated gas and coal-derived gas from the 3rd member of Shahejie Formation (Es³) at mature to high-mature stages.According to the spatial distribution patterns between source rocks and reservoirs, the source-reservoir assemblages can be classified into three types, namely, the united source-reservoir type, the adjacent source-reservoir type and the separated source-reservoir type.The networks of pores, fractures and faults in the deep sand beds constitute the pathways for gas charging.The charging dynamics of deep natural gas is greater than the displacement pressure of faults and sand beds with 7.80-7.95MPa for the united source-reservoir assemblage, and 4.80-9.55 MPa for the last two.Whereas the displacement pressure of fault zones and sand beds ranges from 3.14 to 7.05 MPa, and from 0.01 to 0.29 MPa respectively.There are two kinds of charging patterns for the first assemblage:the first one is that the gas can be charged directly to the sand beds through the source rocks, the primary mode for the united source-reservoir type; the second one is that natural gas has sufficient dynamic to migrate upward through faults, and then can be migrated laterally in the upper sand beds, the main mode for the last two.In addition, the multi-stage and dynamic accumulation process of the deep gas reservoirs in Banqiao Sag is described as "two stages of oil charging, that is, oil charging before gas charging, a dominant pattern in the late period", which results in a distribution of "upper petroleum and lower gas vertically, and hydrocarbon accumulation near faults".

Key words: charging characteristics, accumulation process, deep low-permeability (tight) sand gas reservoir, Banqiao Sag, Huanghua Depression

CLC Number:

TE122.3

Xianzheng Zhao, Jianhui Zeng, Guomeng Han, Sen Feng, Qianru Shi, Yazhou Liu, Dongli Fu, Yanu Wang, Jie Zong, Yi Lu. Charging characteristics and accumulation process of deep low-permeability (tight) sand gas reservoirs in Banqiao Sag, Huanghua Depression[J]. Oil & Gas Geology, 2020, 41(5): 913-927.

Figures/Tables 21

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圈闭名称	圈闭类型	埋深/m	分布层位	主要探井
板40	构造-岩性	4 650	Es³	板深35，板1711
板19	岩性-构造	3 505	Es¹	板19-1
板深9-1	断块	3 861	Es¹	板深9-1
板深67	背斜构造	3 526	Es¹	板深67，板深67-1
板深15	断块	3 671	Es¹	852、852-1，板深15
板深20	构造	3 642	Es²	8-18-14，板深20，17-13
板深13	构造	3 840~3 893	Es²	板深11，13
板深13	构造	4 033	Es³	板深13
板深34	背斜构造	3 550~3 678	Es²	新板22，板深34
板深5-1	复杂断块	3 639	Es³	板深5-1，板深3-2
板深3-2	复杂断块	4 100	Es³	板深3-2

井号	砂层编号	层位	现今埋深/m	充注动力/MPa	源-储结构类型
板深35	1	沙一下	3 300	4.80	源-储分离型
板1711	5	沙二	3 750	9.55	源-储相邻型
板1711	6	沙三1	3 900	6.00	源-储一体型
	7	沙三1	4 050	6.00
	8	沙三1	4 100	6.00
	9	沙三1	4 200	6.00
	10	沙三2	4 860	7.80
	11	沙三2	4 900	7.80
	12	沙三3	5 100	7.80
	13	沙三3	5 200	7.80
板深35	14	沙三2	4 820	7.95
	15	沙三2	4 840	7.95
	16	沙三2	4 860	7.95
	17	沙三2	5 030	7.95
	18	沙三3	5 100	7.95

井号	砂层编号	层位	F₁断层				F₂断层				F₃断层
井号	砂层编号	层位	平均深度/m	断层排替压力/MPa	砂体排替压力/MPa	充注动力/MPa	平均深度/m	断层排替压力/MPa	砂体排替压力/MPa	充注动力/MPa	平均深度/m	断层排替压力/MPa	砂体排替压力/MPa	充注动力/MPa
板深35	1	沙一下	3 300	3.14	0.01	4.80
板1711	5	沙二	3 750	3.74	0.08	9.55
	6	沙三1	3 900	4.06	0.13	6.00	3 900	4.75	0.13	6.00
	7	沙三1	4 050	4.39	0.10	6.00	4 050	4.93	0.10	6.00
	8	沙三1					4100	4.99	0.03	6.00
	9	沙三1	4 200	4.88	0.08	6.00	4 200	5.02	0.08	6.00
	10	沙三2	4 860	6.59	0.29	7.80	4 860	6.12	0.29	7.80
	11	沙三2					4 900	6.17	0.21	7.80
	12	沙三3	5 100	7.05	0.13	7.80	5 100	6.53	0.13	7.80
	13	沙三3					5 200	6.66	0.18	7.80
板深35	14	沙三2					4 820	6.07	0.07	7.95	4 820	5.35	0.07	7.95
	15	沙三2					4 840	6.10	0.13	7.95	4 840	5.27	0.14	7.95
	16	沙三2					4 860	6.23	0.06	7.95	4 860	5.19	0.07	7.95
	17	沙三2					5 030	6.44	0.03	7.95	5 030	5.26	0.03	7.95
	18	沙三3					5 100	6.53	0.08	7.95	5 100	5.23	0.09	7.95

井号	样品号	孔隙度/%	渗透率/(10^-3 μm²)	压汞排驱压力/MPa	气水两相排驱压力/MPa
板深25	2-9	9.7	0.07	2.42	0.46
板深72	4	8.8	0.1	1.91	0.36
板深25	75	14.3	0.2	1.34	0.25
板深27	43	16.1	0.37	0.74	0.14
板深25	73	13.8	0.42	0.84	0.16
板8-17-15	5	16	0.56	0.82	0.16
板深15-1	6	9.4	0.7	0.83	0.16
板深27	40	16.8	0.88	1.05	0.20
板深18	22	11.6	1	0.62	0.12
板22	363	15.3	3	0.27	0.05
板8-17-15	13	16.6	5	0.20	0.04
板深25	2-62	13.3	11	0.08	0.02
板深25	65	10.6	15	0.11	0.02

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Charging characteristics and accumulation process of deep low-permeability (tight) sand gas reservoirs in Banqiao Sag, Huanghua Depression

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