苏北盆地金湖凹陷阜宁组砂岩储层力学性质及影响因素

孙珂; 陈清华

doi:10.11781/sysydz202102343

苏北盆地金湖凹陷阜宁组砂岩储层力学性质及影响因素

doi: 10.11781/sysydz202102343

孙珂,
陈清华^,

中国石油大学(华东) 地球科学与技术学院, 山东青岛 266580

基金项目:

国家科技重大专项“基于模拟实验的断层—砂体油气输导能力评价” 2016ZX05014-002

详细信息

作者简介:
孙珂(1987—), 男, 博士, 从事含油气盆地分析、油气区构造解析研究。E-mail: sunke@s.upc.edu.cn

通讯作者:
陈清华(1958—), 男, 博士, 教授, 从事含油气盆地分析、油气区构造解析研究。E-mail: chenqhua@upc.edu.cn

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-14
- 修回日期: 2021-01-19
- 刊出日期: 2021-03-28

Mechanical properties and influencing factors of Funing Formation sandstone reservoir in Jinhu Sag, Subei Basin

SUN Ke,
CHEN Qinghua^,

School of Geoscience, China University of Petroleum(East China), Qingdao, Shandong 266580, China

摘要

摘要: 储层岩石力学在油气田开发中具有关键作用。以苏北盆地金湖凹陷古近系阜宁组岩心为基础，综合采用岩石力学实验、X衍射、薄片分析、扫描电镜等方法，分析了阜宁组岩性、温度、流体及围压与砂岩力学性质的关系，探讨了各因素的影响机制。岩性是砂岩力学性质的决定性因素，砂岩力学性质与粒度、石英含量、黏土矿物含量、颗粒接触关系以及胶结物含量有关。温度对砂岩力学性质的影响具有分段性：25~100℃时，主导机制为矿物涨缩效应和层间水脱出；100~180℃时，主导机制为热开裂作用。随着油水比例的降低，砂岩力学参数发生规律性变化，砂岩强度弱化与孔隙流体压力、部分饱和作用以及化学作用有关。油田开发中人工措施对砂岩储层力学性质影响显著，在出砂预测和井壁稳定性分析中应引起重视。
- 砂岩储层 /
- 力学性质 /
- 影响因素 /
- 阜宁组 /
- 金湖凹陷 /
- 苏北盆地
Abstract: Reservoir rock mechanics plays a key role in oil and gas field development. The relationship between lithology, temperature, fluid and confining pressure and the mechanical properties of sandstone reservoirs and the influence mechanism of each factor were discussed using rock mechanics tests, X-ray diffraction, cast thin section and scanning electron microscopy analyses of core samples from the Funing Formation in the Jinhu Sag of Subei Basin. Lithology is a decisive factor for the mechanical properties of sandstones, which are related to particle size, quartz content, clay mineral content, particle contact and cement content. The influence of temperature on the mechanical properties of sandstones is segmented. At 25-100 ℃, minerals expand and contract, while interlayer water escapes. At 100-180 ℃, thermal cracking is dominant. As the oil-water ratio decreases, the mechanical parameters of sandstones change regularly, and the weakening of sandstone strength is related to pore fluid pressure, partial saturation and chemical effects. Artificial measures in oilfield development have a significant impact on the mechanical properties of sandstone reservoirs, and attention should be paid on sand production prediction and wellbore stability analysis.
- sandstone reservoir /
- mechanical property /
- influence factor /
- Funing Formation /
- Jinhu Sag /
- Subei Basin

HTML全文

图 1 苏北盆地金湖凹陷构造纲要及取样井分布

Figure 1. Tectonic setting and sampling well locations in Jinhu Sag, Subei Basin

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图 2 苏北盆地金湖凹陷阜宁组砂岩不同温度条件下的应力应变曲线

Figure 2. Stress-strain curves of Funing Formation sandstones under different temperatures in Jinhu Sag, Subei Basin

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图 3 苏北盆地金湖凹陷阜宁组样品饱水4 h后的损伤照片

Figure 3. Damage photos of Funing Formation samples after 4 hours of water saturation, Jinhu Sag, Subei Basin

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图 4 苏北盆地金湖凹陷阜宁组砂岩三轴压缩实验后部分样品照片

Figure 4. Photos of Funing Formation samples after triaxial compression test, Jinhu Sag, Subei Basin

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图 5 苏北盆地金湖凹陷阜宁组粉砂岩、细砂岩力学参数箱型图

Figure 5. Box diagrams of mechanical parameters of Funing Formation siltstones and fine sandstones, Jinhu Sag, Subei Basin

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图 6 苏北盆地金湖凹陷阜宁组砂岩光学显微镜及扫描电镜照片

Figure 6. Optical microscope and SEM photos of Funing Formation sandstones, Jinhu Sag, Subei Basin

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图 7 苏北盆地金湖凹陷阜宁组砂岩力学参数与矿物含量关系

Figure 7. Scatter diagrams of relationship between sandstone mechanical parameters and mineral contents, Jinhu Sag, Subei Basin

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图 8 苏北盆地金湖凹陷阜宁组砂岩力学参数与温度关系

Figure 8. Scatter diagrams of relationship between mechanical parameters of sandstones and temperatures of Funing Formation, Jinhu Sag, Subei Basin

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图 9 苏北盆地金湖凹陷阜宁组砂岩力学参数与油水比例关系散点

Figure 9. Scatter diagrams of relationship between mechanical parameters of sandstones and oil-water ratios of Fuing Formation, Jinhu Sag, Subei Basin

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图 10 苏北盆地金湖凹陷阜宁组砂岩不同围压下的应力应变曲线、弹性模量及泊松比

Figure 10. Stress-strain curves, elastic modulus and Poisson's ratios of Funing Formation sandstones under different confining pressures, Jinhu Sag, Subei Basin

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表 1 苏北盆地金湖凹陷不同岩性条件阜宁组砂岩单轴压缩实验结果

Table 1. Uniaxial compression test results of Funing Formation sandstones under different lithological conditions in Jinhu Sag, Subei Basin

井名	岩性	样品编号	破坏载荷/kN	抗压强度/MPa	弹性模量/GPa	泊松比	矿物碎屑含量/%			碳酸盐胶结物含量/%	黏土矿物含量/%
井名	岩性	样品编号	破坏载荷/kN	抗压强度/MPa	弹性模量/GPa	泊松比	石英	长石	岩屑	碳酸盐胶结物含量/%	黏土矿物含量/%
Yang1	粉砂岩	A0	27.94	55.82	7.58	0.18	56	16	14	6	6.7
Gao6	细砂岩	B0	57.28	114.51	15.98	0.16	69	9	11	8	2.5
Bian9	粉砂岩	C0	20.57	41.08	6.88	0.12	46	18	23	5	6.3
Ta7	细砂岩	D0	43.74	87.56	7.57	0.11	58	13	15	9	3.4
Qin3-1	粉砂岩	E0	46.14	92.32	11.04	0.18	62	19	7	8	2.3
Dongwu1	细砂岩	F0	32.30	64.50	8.59	0.12	53	18	16	9	2.5
Tian89	粉砂岩	G0	50.68	101.67	12.57	0.16	55	12	15	15	2.4
Min30	细砂岩	H0	35.87	71.56	7.63	0.19	52	17	21	6	3.1
Cui4	细砂岩	I0	48.20	96.35	13.61	0.13	61	14	13	9	1.2
Lv1	粉砂岩	J0	34.54	68.94	8.14	0.14	53	17	14	10	4.2
Tian33-4	细砂岩	K0	41.33	82.74	9.26	0.17	60	17	11	7	3.8
Hecan1	细砂岩	L0	58.62	117.19	17.49	0.15	67	11	7	11	2.9

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表 2 苏北盆地金湖凹陷阜宁组砂岩不同温度条件单轴压缩实验结果

Table 2. Uniaxial compression test results of Funing Formation sandstones under different temperatures in Jinhu Sag, Subei Basin

样品编号	温度/℃	破坏载荷/kN	抗压强度/MPa	弹性模量/GPa	泊松比
E01	25	46.94	94.26	12.41	0.195
E02	60	48.86	98.27	11.84	0.183
E03	100	51.31	102.56	13.14	0.161
E04	140	48.83	95.71	10.71	0.169
E05	180	41.31	86.33	9.45	0.182

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表 3 苏北盆地金湖凹陷不同油水比例条件阜宁组砂岩单轴压缩实验结果

Table 3. Uniaxial compression test results of Funing Formation sandstones under different oil-water ratios, Jinhu Sag, Subei Basin

样品编号	油水比例	破坏载荷/kN	抗压强度/MPa	弹性模量/GPa	泊松比
B01	100%/0	42.21	84.37	11.65	0.222
B02	80%/20%	37.87	76.17	9.05	0.271
B03	60%/40%	31.74	63.74	6.92	0.265
B04	40%/60%	28.66	56.75	6.10	0.316
B05	20%/80%	28.33	57.17	6.37	0.303
B06	0/100%	24.97	52.69	5.94	0.313

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表 4 苏北盆地金湖凹陷阜宁组砂岩三轴压缩实验结果

Table 4. Triaxial compression test results of Funing Formation sandstones in Jinhu Sag, Subei Basin

井名	岩心编号	围压/MPa	破坏载荷/kN	抗压强度/MPa	弹性模量/GPa	泊松比
Yang1	A1	10	47.87	95.64	9.49	0.19
	A2	20	58.15	116.12	13.14	0.21
	A3	30	64.65	130.44	14.05	0.23
Gao6	B1	10	62.15	124.37	16.79	0.18
	B2	20	66.91	134.22	17.57	0.20
	B3	30	71.32	152.53	19.1	0.21
Bian9	C1	10	31.11	62.19	8.01	0.13
	C2	20	41.70	83.31	9.14	0.15
	C3	30	77.23	165.70	12.63	0.17
Ta7	D1	10	52.76	105.67	9.78	0.13
	D2	20	61.92	123.78	11.99	0.14
	D3	30	66.43	144.17	15.28	0.16
Qin3-1	E1	10	71.82	143.56	15.39	0.19
	E2	20	98.16	197.00	19.76	0.21
	E3	30	103.64	224.56	20.22	0.22

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