致密砂岩储层流体差异性赋存特征——以鄂尔多斯盆地三叠系延长组为例

张亚东; 高光辉; 刘正鹏; 廖海于; 汪广轮; 丁长灿; 马宏伟; 李泽亮

doi:10.11781/sysydz2021061024

致密砂岩储层流体差异性赋存特征——以鄂尔多斯盆地三叠系延长组为例

doi: 10.11781/sysydz2021061024

1.
中国石油长庆油田分公司勘探事业部, 西安 710018
2.
川庆钻探工程有限公司长庆井下技术作业公司, 西安 710018
3.
中国石油长庆油田分公司第十二采油厂, 西安 710018
4.
中国石油长庆油田分公司第三采油厂, 银川 750000
5.
中国石油长庆油田苏里格南作业分公司, 西安 710018

基金项目:

国家自然科学基金项目 51974253

陕西省教育厅重点项目 18JS084

陕西省高校科协青年人才托举计划 20180703

详细信息

作者简介:
张亚东(1978-), 男, 高级工程师, 从事油气勘探研究。E-mail: zyd1_cq@petrochina.com.cn

通讯作者:
廖海于(1986-), 男, 工程师, 从事油气勘探研究。E-mail: liaohy1_cq@petrochina.com.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: 2020-01-08
- 修回日期: 2021-08-23
- 刊出日期: 2021-11-28

Differential characteristics of fluid occurrence in tight sandstone reservoirs: a case study of Triassic Yanchang Formation in Ordos Basin

1.
Exploration Department, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
2.
Changqing Downhole Technology Operation Company, Chuanqing Drilling Engineering Co., Ltd., Xi'an, Shaanxi 710018, China
3.
No. 12 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
4.
No. 3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan, Ningxia 750000, China
5.
Sulige South Operation Branch, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

摘要

摘要: 为探讨致密砂岩油藏储层流体差异性赋存特征，以鄂尔多斯盆地HQ地区三叠系延长组长6、长8油层组及HS地区长6、长8油层组为研究对象，利用核磁共振技术、高速离心实验，按渗透率区间、地区、目的层层位定量分析储层岩石可动流体含量、不同级别喉道控制的可流动孔隙空间等储层流体差异性赋存特征。不同渗透性级别的储层中，不仅总可动流体饱和度差异较大，而且可动流体赋存的喉道区间也存在较大差异。渗透性好，可动流体由较大喉道控制；渗透性差，可动流体主要由较小喉道控制。在较小喉道半径区间（小于临界喉道半径），随喉道半径增大，可动流体饱和度增加；在较大喉道半径区间（大于临界喉道半径），随喉道半径增加，可动流体饱和度降低。渗透性越好的样品，其临界喉道半径越大。不同地区、不同层位，总可动流体饱和度值由高到低的顺序依次为HQ长8、HS长8、HQ长6、HS长6。
- 流体差异性赋存特征 /
- 喉道半径区间 /
- 致密砂岩油 /
- 延长组 /
- 鄂尔多斯盆地
Abstract: In order to explore the differential characteristics of fluid occurrence in tight sandstone reservoirs, the Chang 6 and Chang 8 reservoirs in the Triassic Yanchang Formation in HQ and HS areas of the Ordos Basin were employed as research objects, the movable and non-movable fluid saturation of reservoir rocks were quantitatively analyzed with features including permeability interval, area and target strata by using nuclear magnetic resonance (NMR) test and high-speed centrifugal experiments. Results showed that the total movable fluid saturation, as well as the main throat intervals of movable fluid were different in reservoirs with different permeability levels. For the high permeability, movable fluid was mainly controlled by larger throat, while for the low permeability, movable fluid was mainly controlled by smaller throat. Movable fluid saturation positively correlated to the throat radius in the smaller throat radius range (< critical throat radius), and negatively correlated to throat radius in the larger throat radius range (>critical throat radius). The higher the permeability, the larger the critical throat radius.
- fluid differential occurrence characteristics /
- throat radius range /
- tight sandstone oil /
- Yanchang Formation /
- Ordos Basin

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图 1 典型岩心样品饱和水状态及不同离心力离心后T₂谱特征

Figure 1. Saturated water state in core and T₂ spectrum after centrifugation under different centrifugal forces

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图 2 可动流体饱和度与气测渗透率、水测孔隙度关系

Figure 2. Relationship between movable fluid saturation and gas permeability and water porosity

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图 3 不同喉道半径区间可动流体饱和度

Figure 3. Movable fluid saturation at different throat radius intervals

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表 1 实验岩心资料及实验结果

Table 1. Experimental core data and results

样号	地区	层位	长度/cm	直径/cm	氮气测孔隙度/%	氮气测渗透率/10^-3μm²	水测孔隙度/%	不同喉道区间对应的可动流体饱和度/%
样号	地区	层位	长度/cm	直径/cm	氮气测孔隙度/%	氮气测渗透率/10^-3μm²	水测孔隙度/%	有效喉道(＞0.05 μm)	0.05~ 0.07 μm	0.07~ 0.10 μm	0.10~ 0.20 μm	0.20~ 0.50 μm	0.50~ 1.00 μm	＞1.00 μm
1	HQ	长6	3.225	2.514	12.3	0.058	12.1	31.28	6.10	9.51	9.57	3.50	1.25	1.34
2	HQ	长8	3.113	2.516	7.8	0.063	7.5	25.52	4.26	8.82	8.51	2.40	0.88	0.65
3	HQ	长8	3.265	2.510	15.2	2.350	14.5	63.94	2.22	3.17	8.76	11.11	13.93	24.76
4	HQ	长8	3.188	2.514	15.5	1.700	14.6	62.97	3.69	4.48	9.24	15.83	14.76	14.98
5	HQ	长8	3.135	2.513	13.8	1.280	12.7	60.91	2.31	3.05	7.70	14.82	15.45	17.58
6	HS	长8	3.187	2.510	11.2	0.182	10.5	49.56	3.01	4.99	10.85	12.77	15.01	2.94
7	HS	长8	3.245	2.508	9.0	0.137	8.8	46.83	2.51	5.89	17.49	16.33	3.56	1.05
8	HQ	长6	3.255	2.510	13.7	0.159	13.7	45.02	3.46	5.68	12.41	17.86	4.98	0.63
9	HQ	长6	3.221	2.512	12.6	0.170	12.6	45.78	3.11	6.51	9.96	16.46	8.73	1.02
10	HQ	长8	3.206	2.513	9.4	0.710	9.6	64.16	2.85	5.30	11.14	19.98	16.87	8.01
11	HQ	长8	3.233	2.515	8.8	0.570	8.8	65.67	1.76	5.28	12.08	18.37	18.36	9.82
12	HQ	长8	3.212	2.513	8.3	0.313	8.4	60.79	1.90	8.48	15.25	24.50	5.28	5.38
13	HQ	长6	3.197	2.510	11.4	0.147	11.5	52.23	4.22	8.33	16.24	21.91	1.49	0.04
14	HQ	长6	3.183	2.515	8.8	0.029	9.1	27.11	6.94	7.29	8.09	2.33	0.63	1.83
15	HQ	长6	3.123	2.516	10.3	0.036	10.4	22.51	4.05	11.13	6.10	0.55	0.47	0.21
16	HQ	长6	3.212	2.515	9.8	0.047	10.2	31.48	5.77	8.87	10.93	3.94	0.94	1.02
17	HQ	长6	3.200	2.511	8.7	0.058	9.3	38.40	4.84	7.34	18.12	6.70	0.58	0.81
18	HQ	长6	3.076	2.515	10.3	0.116	10.2	47.56	4.21	7.97	13.32	12.16	9.64	0.25
19	HQ	长6	3.208	2.516	9.7	0.062	9.6	32.58	7.23	6.43	12.81	3.22	2.39	0.50
20	HQ	长6	3.244	2.515	11.3	0.063	11.4	31.84	5.54	9.63	9.10	3.05	1.03	3.48
21	HQ	长6	3.121	2.516	11.0	0.034	10.9	27.47	5.03	7.61	9.17	1.84	2.13	1.69
22	HQ	长6	3.208	2.515	13.9	4.520	13.8	63.13	0.86	3.63	6.87	8.29	10.29	33.20
23	HS	长6	3.156	2.519	6.8	0.010	7.0	16.27	3.94	5.96	1.77	1.16	1.28	2.17
24	HS	长6	3.260	2.520	7.8	0.012	7.9	18.60	5.77	9.38	0.99	1.20	0.40	0.86
25	HS	长6	3.224	2.519	6.9	0.013	7.1	11.72	3.28	4.27	2.03	0.63	0.84	0.67
26	HS	长6	3.205	2.520	10.7	0.044	10.5	37.29	7.06	12.59	13.01	1.32	0.84	2.48
27	HS	长6	3.268	2.520	10.4	0.039	10.5	37.97	7.28	12.52	14.40	1.54	1.30	0.93
28	HS	长6	3.200	2.520	10.3	0.036	10.2	32.65	4.11	13.10	10.54	3.14	1.61	0.13
29	HS	长6	3.226	2.519	9.5	0.032	9.1	23.01	9.64	5.66	5.42	0.48	0.62	1.19
30	HS	长6	3.243	2.520	9.5	0.056	9.3	30.95	5.95	10.99	11.18	0.82	0.39	1.62
31	HS	长6	3.212	2.518	10.8	0.135	10.7	42.83	4.50	9.15	16.26	8.97	1.13	2.82
32	HS	长6	3.134	2.518	8.8	0.160	8.9	26.45	4.63	10.25	5.72	1.49	1.09	3.28
注：不同喉道区间对应的可动流体饱和度为可流动孔隙空间与岩心总孔隙空间的比值。

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表 2 离心力与喉道半径的对应关系及典型样品临界喉道半径

Table 2. Relationship between centrifugal force and throat radius and threshhold value of throat radius of typical samples

离心力大小与喉道半径对应关系		不同渗透率样品对应的临界喉道半径
离心力/psi	喉道半径/μm	典型样号	典型样品渗透率/10^-3 μm²	渗透率区间/10^-3 μm²	临界喉道半径区间/ μm
21	1.00	4	1.700	1.0~2.0	＞1.0
42	0.50	10	0.710	0.7~1.0	0.2~0.5
104	0.20	11	0.570	0.5~0.7	0.5~1.0
209	0.10	12	0.313	0.3~0.5	0.2~0.5
300	0.07	13	0.147	0.1~0.3	0.2~0.5
417	0.05	14	0.029	< 0.1	0.1~0.2

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表 3 按渗透率区间统计的实验结果

Table 3. Statistical results of experiments by permeability intervals

渗透率/10^-3μm²	样品数	不同喉道区间对应的可动流体饱和度/%
渗透率/10^-3μm²	样品数	0.05~0.07 μm	0.07~0.10 μm	0.10~0.20 μm	0.20~0.50 μm	0.50~1.00 μm	＞1.00 μm	有效喉道(＞0.05 μm)
＞1.0	4	$\frac{0.86 \sim 3.69}{2.27}$	$\frac{3.05 \sim 4.48}{3.59}$	$\frac{6.87 \sim 9.24}{8.14}$	$\frac{8.29 \sim 15.83}{12.51}$	$\frac{10.29 \sim 15.45}{13.61}$	$\frac{14.98 \sim 33.20}{22.63}$	$\frac{60.91 \sim 63.94}{62.74}$
0.3~1.0	3	$\frac{1.76 \sim 2.85}{2.17}$	$\frac{5.28 \sim 8.48}{6.35}$	$\frac{11.14 \sim 15.25}{12.82}$	$\frac{18.37 \sim 24.50}{20.95}$	$\frac{5.28 \sim 18.36}{13.50}$	$\frac{5.38 \sim 9.82}{7.74}$	$\frac{60.79 \sim 65.67}{63.54}$
0.1~0.3	8	$\frac{2.51 \sim 4.63}{3.71}$	$\frac{4.99 \sim 10.25}{7.35}$	$\frac{5.72 \sim 17.49}{12.78}$	$\frac{1.49 \sim 21.91}{13.49}$	$\frac{1.09 \sim 15.01}{5.70}$	$\frac{0.036 \sim 3.28}{1.50}$	$\frac{26.45 \sim 52.23}{44.53}$
＜0.1	17	$\frac{3.28 \sim 9.64}{5.69}$	$\frac{4.27 \sim 13.10}{8.89}$	$\frac{0.99 \sim 18.12}{8.93}$	$\frac{0.48 \sim 6.70}{2.23}$	$\frac{0.39 \sim 2.39}{1.03}$	$\frac{0.13 \sim 3.48}{1.27}$	$\frac{11.72 \sim 38.40}{28.04}$
注：可动流体饱和度指可流动孔隙空间百分数，表中分式意义为：$\frac{\text { 最小值 } \sim \text { 最大值 }}{\text { 平均值 }}$，表 4，表 5，表 6中的分式意义相同。

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表 4 按地区统计的实验结果

Table 4. Statistical results of experiments by regions

地区	样品数	不同喉道区间对应的可动流体饱和度/%
地区	样品数	0.05~0.07 μm	0.07~0.10 μm	0.10~0.20 μm	0.20~0.50 μm	0.50~1.00 μm	＞1.00 μm	有效喉道(＞0.05 μm)
HQ	20	$\frac{0.86 \sim 7.23}{4.02}$	$\frac{3.05 \sim 11.13}{6.93}$	$\frac{6.10 \sim 18.12}{10.77}$	$\frac{0.55 \sim 24.50}{10.44}$	$\frac{0.47 \sim 18.36}{6.50}$	$\frac{0.036 \sim 33.20}{6.36}$	$\frac{22.51 \sim 65.67}{45.02}$
HS	12	$\frac{2.51 \sim 9.64}{5.14}$	$\frac{4.27 \sim 13.10}{8.73}$	$\frac{0.99 \sim 17.49}{9.14}$	$\frac{0.48 \sim 16.33}{4.15}$	$\frac{0.39 \sim 15.01}{2.34}$	$\frac{0.13 \sim 3.28}{1.68}$	$\frac{11.72 \sim 49.56}{31.18}$

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表 5 按层位统计的实验结果

Table 5. Statistical results of experiments by horizons

层位	样品数	不同喉道区间对应的可动流体饱和度/%
层位	样品数	0.05~0.07 μm	0.07~0.10 μm	0.10~0.20 μm	0.20~0.50 μm	0.50~1.00 μm	＞1.00 μm	有效喉道(＞0.05 μm)
长6	23	$\frac{0.86 \sim 9.64}{5.11}$	$\frac{3.63 \sim 13.10}{8.43}$	$\frac{0.99 \sim 18.12}{9.74}$	$\frac{0.48 \sim 21.91}{5.33}$	$\frac{0.39 \sim 10.29}{2.35}$	$\frac{0.036 \sim 33.20}{2.70}$	$\frac{11.72 \sim 63.13}{33.66}$
长8	9	$\frac{1.76 \sim 4.26}{2.72}$	$\frac{3.05 \sim 8.82}{5.50}$	$\frac{7.70 \sim 17.49}{11.22}$	$\frac{2.40 \sim 24.50}{15.12}$	$\frac{0.88 \sim 18.36}{11.57}$	$\frac{0.65 \sim 24.76}{9.46}$	$\frac{25.52 \sim 65.67}{55.59}$

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表 6 按地区层位统计的实验结果

Table 6. Statistical results of experiments by regions and horizons

地区	层位	样品数	不同喉道区间对应的可动流体饱和度/%
地区	层位	样品数	0.05~0.07 μm	0.07~0.10 μm	0.10~0.20 μm	0.20~0.50 μm	0.50~1.00 μm	＞1.00 μm	有效喉道(＞0.05 μm)
HQ	长6	13	$\frac{0.86 \sim 7.23}{4.72}$	$\frac{3.63 \sim 11.13}{7.69}$	$\frac{6.10 \sim 18.12}{10.98}$	$\frac{0.55 \sim 21.91}{7.83}$	$\frac{0.47 \sim 10.29}{3.43}$	$\frac{0.036 \sim 33.20}{3.54}$	$\frac{22.51 \sim 63.13}{38.18}$
HQ	长8	7	$\frac{1.76 \sim 4.26}{2.71}$	$\frac{3.05 \sim 8.82}{5.51}$	$\frac{7.70 \sim 15.25}{10.38}$	$\frac{2.40 \sim 24.50}{15.29}$	$\frac{0.88 \sim 18.36}{12.22}$	$\frac{0.65 \sim 24.76}{11.60}$	$\frac{25.52 \sim 65.67}{57.71}$
HS	长6	10	$\frac{3.28 \sim 9.64}{5.61}$	$\frac{4.27 \sim 13.10}{9.39}$	$\frac{0.99 \sim 16.26}{8.13}$	$\frac{0.48 \sim 8.97}{2.08}$	$\frac{0.39 \sim 1.61}{0.95}$	$\frac{0.13 \sim 3.28}{1.62}$	$\frac{11.72 \sim 42.83}{27.77}$
HS	长8	2	$\frac{2.51 \sim 3.01}{2.76}$	$\frac{4.99 \sim 5.89}{5.44}$	$\frac{10.85 \sim 17.49}{14.17}$	$\frac{12.77 \sim 16.33}{14.55}$	$\frac{3.56 \sim 15.01}{9.28}$	$\frac{1.05 \sim 2.94}{1.99}$	$\frac{46.83 \sim 49.56}{48.19}$

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