致密砂岩储层微观孔喉分布特征及对可动流体的控制作用

钟红利; 张凤奇; 赵振宇; 魏驰; 刘阳

doi:10.11781/sysydz202101077

致密砂岩储层微观孔喉分布特征及对可动流体的控制作用

doi: 10.11781/sysydz202101077

钟红利^1,,
张凤奇^2, ,,
赵振宇³,
魏驰^{2, 4},
刘阳²

1.
西安科技大学地质与环境学院, 西安 710054
2.
西安石油大学地球科学与工程学院, 西安 710065
3.
中国石油勘探开发研究院, 北京 100083
4.
中交一公局集团有限公司, 北京 100024

基金项目:

国家自然科学基金项目 41502137

国家油气重大专项项目 2017ZX05039-001-003

陕西省自然科学基础研究计划 2017JM4004

陕西省教育厅重点实验室科研计划项目 17JS110

详细信息

作者简介:
钟红利(1979-), 女, 博士, 讲师, 从事储层地质学和地震资料解释方面的研究。E-mail: 497322725@qq.com

通讯作者:
张凤奇(1981-), 男, 博士, 副教授, 从事非常规油气形成机制与富集规律方面的研究。E-mail: 155205417@qq.com

中图分类号: TE122.2
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- 文章访问数: 570
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- 被引次数: 0
出版历程
- 收稿日期: 2019-08-14
- 修回日期: 2020-12-04
- 刊出日期: 2021-01-28

Micro-scale pore-throat distributions in tight sandstone reservoirs and its constrain to movable fluid

ZHONG Hongli^1
,,
ZHANG Fengqi^{2
, ,},
ZHAO Zhenyu³,
WEI Chi^{2, 4},
LIU Yang²

1.
College of Geology & Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China
2.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4.
CCCC First Highway Engineering Company Ltd., Beijing 100024, China

摘要

摘要: 为分析致密砂岩储层多尺度微观孔喉分布对可动流体的控制作用，以鄂尔多斯盆地伊陕斜坡东南部三叠系延长组长6、长7和长8油层组为例，将高压压汞与核磁共振技术结合，研究致密砂岩储层多尺度微观孔喉分布特征，将离心实验与核磁共振T₂谱分析技术相结合，探讨致密砂岩储层可动流体的分布特征，两者结合研究致密砂岩储层孔喉分布对可动流体的控制作用。研究区延长组致密砂岩储层微观孔喉半径分布范围宽，分布在0.6~3 050.8 nm，主体分布在10~500 nm，表明该致密砂岩储层主要发育微、纳米级孔喉，主体为纳米级孔喉；致密砂岩储层中可动流体饱和度为9.83%~25.64%，平均值为17.53%，普遍较低。储层孔隙度和储层渗透率与可动流体孔隙度具有较好的正相关性，表明储层物性条件对致密砂岩储层可动流体分布具有较好的控制作用；大于50 nm孔喉占全部孔喉比率、大于100 nm孔喉占全部孔喉比率、最大孔喉半径、峰值孔喉半径等参数与储层可动流体孔隙度均具有较好的正相关性，表明储层中相对较大孔喉，尤其大于100 nm孔喉的分布对致密砂岩储层可动流体含量具有重要的控制作用；孔喉的分选系数与可动流体含量表现为正相关，这主要与致密砂岩储层中孔喉半径分布较宽且分选好的致密砂岩主要以细小孔喉为主有关。
- 高压压汞 /
- 核磁共振 /
- 可动流体 /
- 致密砂岩 /
- 延长组 /
- 鄂尔多斯盆地
Abstract: To understand the constrains of multi-scale microscopic pore-throat distributions to the movable fluid in tight sandstone reservoirs, high-pressure mercury injection and nuclear magnetic resonance (NMR) were employed to obtain the distribution characteristics of micro-scale pore-throat distributions of Chang 6, Chang 7 and Chang 8 oil-bearing sections of the Yanchang Formation in the southeastern part of the Yishan slope, Ordos Basin. The occurrences feature of movable fluid in tight sandstone reservoirs were also investigated by centrifugal experiment and the T2 spectrum analysis of NMR. Results show that the microscopic pore-throat radius distribution in the tight sandstone reservoirs of Yanchang Formation has a wide distribution (ranging from 1. 13 to 3 050. 80 nm), mainly distributed from 10 to 500 nm, referring to micro- and nano-scale pore-throats and mainly were nano-scale. The movable fluid saturation in tight sandstone reservoirs ranged from 9. 83% to 25. 64% with an average value of 17.53%, indicating a low content in tight sandstone reservoirs. The porosity and permeability of studied reservoirs were positively correlated to the pore-throats having movable fluid, indicating the physical properties of reservoirs playing a role in controlling the distribution of movable fluid in tight sandstone reservoirs.The ratio of pore-throat which greater than 50 nm, and ratio of pore-throat greater than 100 nm, the maximum pore-throat radius, peak pore throat radius etc., showed a positive correlation with the porosity of movable fluid in tight sandstone reservoirs. It can be indicated that the distribution of relative larger pore-throasts, especially those larger than 100 nm, have strong controlling affection to the relative content of movable fluid in tight sand- stone reservoirs. The sorting coefficient of pore-throat is positively correlated with the content of flexible fluid due to the well-sorted tight sandstones with a wide pore-throat radius distribution in tight sandstone reservoirs are dominated by fine pore-throats.
- high-pressure mercury injection /
- nuclear magnetic resonance /
- movable fluid /
- tight sandstone /
- Yan- chang Formation /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地伊陕斜坡东南部研究区位置及地层综合柱状图

Figure 1. Location and comprehensive strata profile of study area, southeastern Yishan slope, Ordos Basin

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图 2 鄂尔多斯盆地伊陕斜坡东南部研究区样品5核磁共振T₂谱标定

Figure 2. T₂ spectrum calibration diagram of sample 5 of study area, southeastern Yishan slope, Ordos Basin

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图 3 鄂尔多斯盆地伊陕斜坡东南部研究区7个致密砂岩样品的孔喉半径分布

Figure 3. Distribution of pore-throat radius of seven tight sandstone samples of study area, southeastern Yishan slope, Ordos Basin

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图 4 鄂尔多斯盆地伊陕斜坡东南部研究区样品5不同离心力后T₂谱分布及含水饱和度变化

Figure 4. T₂spectral distribution and water saturation variety of sample 5 under different centrifugal forces of study area, southeastern Yishan slope, Ordos Basin

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图 5 鄂尔多斯盆地伊陕斜坡东南部研究区样品6不同离心力后T₂谱分布及含水饱和度变化

Figure 5. T₂ spectral distribution and water saturation variety of sample 6 under different centrifugal forces of study area, southeastern Yishan slope, Ordos Basin

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图 6 鄂尔多斯盆地伊陕斜坡东南部研究区样品7不同离心力后T₂谱分布及含水饱和度变化特征

Figure 6. T₂ spectral distribution and water saturation variety of sample 7 under different centrifugal forces of study area, southeastern Yishan slope, Ordos Basin

下载: 全尺寸图片幻灯片

图 7 鄂尔多斯盆地伊陕斜坡东南部研究区可动流体孔隙度与孔隙度及渗透率的关系

Figure 7. Relationship between movable fluid porosity and porosity and permeability of study area, southeastern Yishan slope, Ordos Basin

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图 8 鄂尔多斯盆地伊陕斜坡东南部研究区高压压汞孔喉分布及渗透率贡献

Figure 8. Pore-throat distribution and permeability contribution by high pressure mercury test of study area, southeastern Yishan slope, Ordos Basin

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图 9 鄂尔多斯盆地伊陕斜坡东南部研究区可动流体孔隙度与不同孔喉区间占比的关系

Figure 9. Relationship between movable fluid porosity and the proportion of different pore-throats in the study area, southeastern Yishan slope, Ordos Basin

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图 10 鄂尔多斯盆地伊陕斜坡东南部研究区可动流体孔隙度与大于50 nm及大于100 nm孔喉占比的关系

Figure 10. Relationship between movable fluid porosity and the proportion of pore-throats greater than 50 and 100 nm of study area, southeastern Yishan slope, Ordos Basin

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图 11 鄂尔多斯盆地伊陕斜坡东南部研究区可动流体孔隙度与最大孔喉半径及峰值孔喉半径的关系

Figure 11. Relationship between movable fluid porosity and ratio of maximum pore-throat radius and peak pore-throat radius of study area, southeastern Yishan slope, Ordos Basin

下载: 全尺寸图片幻灯片

图 12 鄂尔多斯盆地伊陕斜坡东南部研究区可动流体孔隙度与孔喉分选系数的关系

Figure 12. Relationship between movable fluid porosity and sorting coefficient of pore-throats of study area, southeastern Yishan slope, Ordos Basin

下载: 全尺寸图片幻灯片

表 1 鄂尔多斯盆地伊陕斜坡东南部研究区核磁共振实验样品基本参数

Table 1. Basic parameters of testing samples for nuclear magnetic resonance of study area, southeastern Yishan slope, Ordos Basin

样品号	井号	取心资料			常规物性			核磁共振T₂谱转换孔喉分布
样品号	井号	油层组	顶深/m	岩性	气测孔隙度/%	水测孔隙度/%	渗透率平均值/(10^-3 μm²)	转化系数/(nm·ms^-1)	最小孔喉半径/nm	最大孔喉半径/nm
1	M57-1	长6	908.78	砂岩	5.15	5.34	0.004	13.0	1.30	1 618.8
2	M57-1	长6	909.42	砂岩	6.13	6.10	0.022	13.0	1.30	2 333.0
3	M101	长7	859.98	砂岩	8.73	8.35	0.104	10.0	1.00	2 154.4
4	M66-2	长7	975.33	砂岩	5.07	4.68	0.001	8.0	0.80	829.8
5	M14-2	长7	739.24	砂岩	8.90	8.34	0.124	12.0	1.20	1 793.8
6	M14-2	长7	742.69	砂岩	11.29	10.79	0.051	17.0	1.70	3 050.8
7	M14-2	长8	911.94	砂岩	5.59	5.29	0.002	6.0	0.60	1 863.0
平均值								11.3	1.13	1 949.1

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表 2 鄂尔多斯盆地伊陕斜坡东南部研究区7个致密砂岩样品不同孔喉半径区间所控制的可动流体饱和度

Table 2. Movable fluid saturation controlled by different pore-throat radius intervals of seven tight sandstone samples of study area, southeastern Yishan slope, Ordos Basin

样品号	不同状态下岩心含水饱和度/%				不同孔喉半径区间控制的可动流体饱和度/%
样品号	0.14 MPa离心后	0.29 MPa离心后	1.43 MPa离心后	2.88 MPa离心后	大于1.0 μm	0.5~1.0 μm	0.10~0.5 μm	0.05~0.10 μm	大于0.05 μm总和
1	98.50	96.27	92.60	79.61	1.50	2.23	3.66	13.00	20.39
2	98.21	94.82	88.04	74.36	1.79	3.39	6.78	13.68	25.64
3	96.76	93.66	88.88	78.86	3.24	3.10	4.78	10.02	21.14
4	99.55	98.12	95.89	90.17	0.45	1.43	2.22	5.72	9.83
5	96.54	94.54	90.65	85.39	3.46	2.00	3.89	5.26	14.61
6	97.79	95.39	93.10	86.55	2.21	2.40	2.29	6.55	13.45
7	98.89	96.16	90.31	82.36	1.11	2.73	5.85	7.95	17.64

下载: 导出CSV

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