松辽盆地扶新隆起带扶杨油层地层水化学特征及其与油气运聚关系

doi:10.11743/ogg20200209

Abstract

Abstract:

After nearly 60 years of exploration and development, Fuyang oil layer in Fuxin Uplift still remains one of the most important hydrocarbon accumulation zones in Southern Songliao Basin.However, the structural setting of Fuxin Uplift is complex:faults are densely developed, the contacts between oil, gas and water layers are extremely complex, and the process of hydrocarbon migration and accumulation and the hydrocarbon enrichment pattern stay to be identified.These factors greatly restrict further efforts made for hydrocarbon exploration and development.Following the analysis of the origin and the vertical and horizontal distribution patterns of formation water in Fuyang oil layer on the northern slope of Fuxin Uplift, we dissected the typical reservoir profiles in key areas, and made an in-depth discussion on the coupling relations between formation water characteristics and hydrocarbon migration, accumulation and enrichment in Fuyang oil layer in Fuxin Uplift in combination with analysis of formation pressure and source rocks.Vertically, five hydrochemical zones can be identified in Fuxin Uplift:diluted zones from meteoric water percolation, diluted zone from compaction, concentrated zone from dissolution, diluted zone from clay mineral dehydration, as well as concentrated zone from over flow.In the plane, the Xinbei and Xinli nose-like structural zones in the study area are the areas where two major centrifugal flows converge and result in cross-formational flow, leading to the high consistency between zones of high salinity and high sodium chloride coefficient and zones of hydrocarbon enrichment.The oil source conditions are relatively better in the intra-source and near-source hydrocarbon accumulation zones, and the depth of hydrocarbon-bearing fluid disturbance is deeper, favorable for hydrocarbon accumulation.However, the source rocks in out-of-source hydrocarbon accumulation zones are low in maturity, and the depth of hydrocarbon-bearing fluid disturbance is shallow, unfavorable for hydrocarbon accumulation.

Key words: hydrochemistry of formation water, hydrocarbon migration, hydrocarbon accumulation, Fuxin Uplift, Songliao Basin

CLC Number:

TE122.1

Xiaohan Mei, Qin Zhang, Yayun Wang, Xinsong Wu, Jingyan Liu, Jiahong Zhao, Wuxue Wang. Hydrochemical characteristics of formation water and its relationship with hydrocarbon migration and accumulation in Fuyang oil layer in Fuxin Uplift, Songliao Basin[J]. Oil & Gas Geology, 2020, 41(2): 328-338, 358.

Figures/Tables 10

Fig.1

Table 1

Testing results of some formation water samples from Fuyang oil layer in Fuxin Uplift"

井号	深度/(m)	层位	离子浓度						TDS/(mg·L^-1)	r(Ca⁺)/r(Cl^-)	r(Ca²⁺)/r(Mg²⁺)	r(Cl^-)/r(Mg²⁺)	r(SO₄^2-)×100/r(Mg²⁺)	水型	油气显示
井号	深度/(m)	层位	Na⁺+K⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	TDS/(mg·L^-1)	r(Ca⁺)/r(Cl^-)	r(Ca²⁺)/r(Mg²⁺)	r(Cl^-)/r(Mg²⁺)	r(SO₄^2-)×100/r(Mg²⁺)	水型	油气显示
庙108	1 320~1 326	K₁q⁴	1 677.4	149.7	32.2	2 278.0	46.1	1 089.8	5 273.2	1.046	2.79	23.91	1.562	NaHCO₃	油迹
庙116	1 400~1 407	K₁q⁴	2 510.0	244.9	11.4	3 841.0	38.4	805.5	7 450.9	0.928	12.89	113.90	0.772	NaHCO₃	油斑
庙130	1 318~1 331	K₁q³	1 869.3	212.0	22.0	2 819.0	98.9	739.6	5 760.8	0.942	5.78	43.31	2.758	Na₂SO₄	油斑
民45	930~933	K₁q⁴	2 077.1	82.8	9.4	2 268.8	74.4	1 812.3	6 324.8	1.300	5.29	81.59	2.531	NaHCO₃	油斑
民51	917~925	K₁q⁴	2 256.7	69.9	18.1	3 216.0	167.6	544.9	6 273.2	0.996	2.32	60.06	4.022	NaHCO₃	油斑
民66	1 083~1 089	K₁q³	2 156.7	332.9	11.4	2 831.7	1 171.9	455.8	6 969.4	1.086	17.52	83.96	31.941	Na₂SO₄	荧光
新104	1 176~1 180	K₁q⁴	6 199.9	15.2	7.2	2 756.3	49.8	10 852.0	20 312.0	3.194	1.27	130.30	1.393	NaHCO₃	油迹
新213	1 308~1 311	K₁q⁴	2 899.3	311.8	3.2	4 402.5	342.9	646.8	8 606.5	0.935	58.46	465.11	6.011	NaHCO₃	油浸
新215	1 474~1 478	K₁q³	2 244.1	206.0	2.8	3 546.8	171.9	247.0	6 445.6	0.898	44.14	428.23	3.741	CaCl₂	无
新330	1 629~1 646	K₁q⁴	2 343.4	227.1	18.4	2 481.5	1 251.2	1 142.3	7 463.9	1.341	7.41	45.59	38.913	NaHCO₃	油斑
新342	1 788~1 796	K₁q³	1 770.5	186.8	3.0	1 456.6	1 464.4	915.3	5 796.6	1.726	37.36	164.14	77.592	NaHCO₃	荧光
木16	1 241~1 245	K₁q⁴	2 318.4	168.3	3.1	3 772.8	49.4	124.5	6 436.4	0.873	33.01	416.81	1.011	CaCl₂	荧光
木254	843~848	K₁q⁴	2 499.9	126.1	14.0	3 550.7	62.9	897.6	7 151.2	0.999	5.40	85.73	1.266	NaHCO₃	油斑
扶126	257~265	K₁q⁴	1 572.1	20.0	18.2	1 482.9	96.1	1 039.2	4 529.2	1.505	0.67	27.54	5.001	NaHCO₃	含油
扶深4	462~467	K₁q³	1 692.3	30.9	6.2	1 885.9	12.5	1 354.6	4 982.4	1.274	2.99	102.82	0.512	NaHCO₃	油斑

Table 1

Table 2

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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系数	计算公式	影响因素	地质意义	扶余油层(泉四段)	杨大城子油层(泉三段)	塔里木油田塔中地区志留系	鄂尔多斯呼图壁气田古近系
钠氯系数	r(Na⁺)/r(CT)	浓缩变质	地层封闭性越高，钠氯系数越小	$\frac{0.84 \sim 6.0}{1.51(258)}$	$\frac{0.85 \sim 3.29}{1.27(136)}$	$\frac{0.33 \sim 1.38}{1.87(48)}$	$\frac{0.16 \sim 1.24}{0.84}$
变质系数	[r(Cl^-)-r(Na⁺+K⁺)]/r(Mg²⁺)	变质作用阳离子交换	地层封闭时间越长，变质时间越长，变质系数越大	$\frac{-3390 \sim 614.9}{-22.63(243)}$	$\frac{-536.4\sim 955.85}{79.9(117)}$	$\frac{-129.99 \sim 61.95}{5.54(50)}$
脱硫系数	r(SO₄^2-)×100/r(Cl^-)	脱硫酸作用	SO₄^2-与烃类反应，脱硫系数越小，越有利于油气保存	$\frac{0.05 \sim 87.08}{11.54(257)}$	$\frac{0.17 \sim 157.86}{17.95(136)}$	$\frac{0 \sim 101.77}{7.38(50)}$	1.15~114.92
氯镁系数	r(Cl^-)/r(Mg²⁺)	阳离子交换	地层封闭性越高，钠氯系数越大	$\frac{13.04 \sim 780.8}{126.67(243)}$	$\frac{8.67 \sim 893.87}{171.89(118)}$		$\frac{42.94 \sim 375.61}{167.83}$

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Hydrochemical characteristics of formation water and its relationship with hydrocarbon migration and accumulation in Fuyang oil layer in Fuxin Uplift, Songliao Basin

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