江汉盆地潜江凹陷盐间潜3<sup>4</sup>油组储层微观结构特征及与物性的关系

徐文明; 蒋启贵; 刘伟新; 陶国亮; 张文涛; 钱门辉; 曹婷婷; 鲍云杰; 李志明

doi:10.11781/sysydz202004565

江汉盆地潜江凹陷盐间潜3⁴油组储层微观结构特征及与物性的关系

doi: 10.11781/sysydz202004565

徐文明^1,,
蒋启贵^{1, 2},
刘伟新^{1, 2},
陶国亮^{1, 2},
张文涛^{1, 2},
钱门辉^{1, 2},
曹婷婷^{1, 2},
鲍云杰^{1, 2},
李志明^{1, 2}

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
中国石油化工集团公司油气成藏重点实验室, 江苏无锡 214126

基金项目:

国家科技重大专项 2017ZX05049-001-001

国家自然科学基金 U19B6003-02

国家自然科学基金 41972163

国家自然科学基金 41972164

详细信息

作者简介:
徐文明(1964-), 男, 工程师, 从事油气地质研究。E-mail: xuwm.syky@sinopec.com

中图分类号: TE122.23
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-11
- 修回日期: 2020-06-25
- 刊出日期: 2020-07-28

Micro-pore structure in an inter-salt shale oil reservoir and the relationship with physical properties in the fourth section of the third member of Qianjiang Formation, Qianjiang Sag, Jianghan Basin

XU Wenming^1
,,
JIANG Qigui^{1, 2},
LIU Weixin^{1, 2},
TAO Guoliang^{1, 2},
ZHANG Wentao^{1, 2},
QIAN Menhui^{1, 2},
CAO Tingting^{1, 2},
BAO Yunjie^{1, 2},
LI Zhiming^{1, 2}

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China

摘要

摘要: 以X衍射、薄片、常规扫描电镜及氩离子抛光扫描电镜、FIB三维孔隙重构等手段，结合压汞及氮气吸附孔体积定量分析，研究了江汉盆地潜江凹陷盐间潜3⁴油组页岩油储层微观结构及与物性的关系。按矿物含量的高低，把储层划分为云质泥岩、泥质云岩及含泥云岩三大类。该储层矿物组成、结构非均质性强，常规柱孔隙度变化大，在1%~13%之间。其中云质泥岩孔隙度低，泥质云岩、含泥云岩孔隙度高，钙芒硝含量高的泥岩孔隙度较低。储层微观结构变化大，云质泥岩具定向排列结构，以狭长状或扁平状微孔隙为主；孔径小，以直径20~50 nm的孔隙体积为主，最大连通喉道小，在22~42 nm之间。泥质云岩以残余粒间孔及粒间充填的黏土片间孔为主，孔径变大，以直径20~80 nm的孔隙体积为主，最大连通喉道变化大，在16~158 nm之间。含泥云岩以均匀晶粒结构、多边形等轴状晶间微孔为主；孔径大，以直径80~180 nm的孔隙体积为主，最大连通喉道大，在158~196 nm。云质泥岩、泥质云岩、含泥云岩的孔隙连通分别具有“缝—缝、孔—缝、孔—孔相连”的特征，含泥云岩孔隙度大、连通喉道宽、孔隙结构优，具最好的页岩油储集空间。
- 矿物组成 /
- 孔隙度 /
- 微观结构 /
- 页岩油储层 /
- 潜江组 /
- 潜江凹陷 /
- 江汉盆地
Abstract: The micro-pore structure of an inter-salt shale oil reservoir and its relationship with physical properties in the fourth section of the third member of Qianjiang Formation (Eq₃⁴) in the Qianjiang Sag of Jianghan Basin were studied using X-ray diffraction, thin section observation, conventional scanning electron microscopy (SEM), argon ion polishing SEM and three-dimensional pore reconstruction of focused ion beam, microscopy combined with quantitative analysis of mercury intrusion and nitrogen adsorption pore volume. According to the level of mineral content, the reservoir is divided into three categories: dolomitic mudstone, argillaceous dolomite and muddy dolomite. The mineral composition and structure of the reservoir are highly heterogeneous, and the conventional core-plug porosity varies greatly, ranging from 1% to 13%. The porosity of dolomitic mudstone is low, the porosity of argillaceous dolomite and muddy dolomite is high, and the porosity of mudstone with high content of glauberite is low. The reservoir microstructure changes greatly, and the dolomitic mudstone has a directional arrangement structure, mainly with elongated or flat micropores. The pore size is small, with a pore diameter of 20-50 nm, and the largest connecting throat is small, ranging from 22 to 42 nm. The argillaceous dolomite mainly contains residual intergranular pores and pores between clay layers. The pore diameter becomes larger, mainly 20 to 80 nm. The maximum connecting throat varies greatly, between 16 and 158 nm. The muddy dolomite is mainly composed of uniform grain structure, polygonal equidimensional intergranular micropores. The pore size is large, 80-180 nm. The largest connecting throat is large, at 158-196 nm. The pore connection of dolomitic mudstone, argillaceous dolomite and muddy dolomite has the characteristics of "fracture-fracture, pore-fracture, pore-pore connection", respectively. The muddy dolomite has high porosity, wide connecting throats, and favorable pore structure, indicating the best shale oil storage space.
- mineral composition /
- porosity /
- micro structure /
- shale oil reservoir /
- Qianjiang Formation /
- Qianjiang Sag /
- Jianghan Basin

HTML全文

图 1 江汉盆地潜江凹陷潜3⁴油组有利区分布和蚌页油1、2井位置

据参考文献[4]修改。

Figure 1. Favorable targets for Eq₃⁴ oil group and location of shale oil wells BYY1 and BYY2, Qianjiang Sag, Jianghan Basin

下载: 全尺寸图片幻灯片

图 2 江汉盆地潜江凹陷蚌页油1井潜3⁴油组页岩储层矿物分布

Figure 2. Mineral composition of shale reservoir in Eq₃⁴ oil group, well BYY1, Qianjiang Sag, Jianghan Basin

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图 3 江汉盆地潜江凹陷盐间潜3⁴油组页岩油储层微观结构

a.云质泥岩，BYY1-45，纹层结构；b.云质泥岩，BYY1-45，黏土与有机质粘合纹层，见油浸；c.云质泥岩，BYY1-45，黏土定向排列与层理缝；d.云质泥岩，BYY1-45，纹层及层理缝；e.泥质云岩，BYY1-61；黏土充填白云石粒间；f.泥质云岩，BYY1-61，白云石微晶放大；g.泥质云岩，BYY1-61，致密块状见黄铁矿斑块；h.泥质云岩，BYY1-61，黏土略减少，粒间充填，略定向；i.含泥云岩，BYY1-220，均匀致密块状结构，10×2.5；j.含泥云岩，BYY1-220，以白云石微晶为主，见油浸；k.含泥云岩，BYY1-220，均匀致密块状结构；l.含泥云岩，BYY1-220，放大，白云石微晶结构，晶间少量黏土，晶间微孔为主；m.钙芒硝云质泥岩，BYY1-224，钙芒硝与云质泥岩微细互层；n.钙芒硝云质泥岩，BYY1-253，钙芒硝晶体分散状；o.钙芒硝云质泥岩，BYY1-253，钙芒硝包裹的微晶石英及溶蚀孔

Figure 3. Micro structure of shale oil reservoir, Eq₃⁴ oil group, Qianjiang Sag, Jianghan Basin

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图 4 江汉盆地潜江凹陷盐间页岩油储层微孔隙与连通性氩离子抛光、注合金扫描电镜分析

Figure 4. Scanning electron microscopy of micropores and connectivity with argon ion polishing and alloy injection in inter-salt shale oil reservoirs in Qianjiang Sag, Jianghan Basin

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图 5 江汉盆地潜江凹陷页岩油储层FIB三维孔隙结构分析

Figure 5. FIB 3D microstructure reconstruction of shale oil reservoir, Qianjiang Sag, Jianghan Basin

下载: 全尺寸图片幻灯片

图 6 江汉盆地潜江凹陷蚌页油1井潜3⁴油组储层钙芒硝含量与孔隙度的关系

Figure 6. Relationship between glauberite content and porosity of reservoir in Eq₃⁴ oil group, well BYY1, Qianjiang Sag, Jianghan Basin

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图 7 江汉盆地潜江凹陷蚌页油1井潜3⁴油组储层不同岩性常规与压汞孔隙度对比

Figure 7. Comparison between core-plug and mercury injection porosities of reservoir with different lithologies in Eq₃⁴ oil group, well BYY1, Qianjiang Sag, Jianghan Basin

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图 8 江汉盆地潜江凹陷蚌页油1井潜3⁴油组储层压汞分析最大连通半径与中值半径

Figure 8. Maximum connected radius and median radius with mercury intrusion analysis of reservoir in Eq₃⁴ oil group, well BYY1, Qianjiang Sag, Jianghan Basin

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图 9 江汉盆地潜江凹陷蚌页油1井潜3⁴油组储层孔体积分布

Figure 9. Pore volume distribution of reservoir in Eq₃⁴ oil group, well BYY1, Qianjiang Sag, Jianghan Basin

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图 10 江汉盆地潜江凹陷蚌页油2井页岩储层注伍德合金氩离子抛光扫描电镜连通喉道分析

Figure 10. Connected pore throat width with Wood's alloy injection and argon ion polishing scanning electron microscope of shale reservoir in well BYY2, Qianjiang Sag, Jianghan Basin

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表 1 江汉盆地潜江凹陷蚌页油1、2井页岩油储层全岩X衍射及物性分析

Table 1. Whole rock X-ray diffraction and physical property analyses of shale oil reservoir in wells BYY1 and BYY2, Qianjiang Sag, Jianghan Basin %

井号	样号	岩性	井深/m	地层	黏土	石英	钾长石	斜长石	方解石	白云石	菱铁矿	石盐	黄铁矿	硬石膏	钙芒硝	孔隙度(柱)	压汞孔隙度	最大连通半径/nm	中值半径/nm
蚌页油1井	45	云质泥岩	3 124.1	Eq₃	29.6	14.5	1.0	6.4	5.8	28.8	0.3		4.5	1.1	8.0	1.1	4.5	11	4
	55	泥质云岩	3 124.4	Eq₃	19.2	9.2	0.9	7.2	16.5	40.2	0.4	0.7	2.0	1.3	2.3	8.4	5.1	8	4
	61	泥质云岩	3 124.7	Eq₃	18.7	9.2	0.8	7.5	19.6	34.9	0.2	0.5	5.3	2.1	1.2	1.0	3.8	11	4
	67	云质泥岩	3 124.9	Eq₃	38.6	17.8	1.2	6.7	18.6	5.0	0.5	0.1	8.0	1.2	2.4	3.1	7.1	11	4
	143	泥质云岩	3 127.3	Eq₃	18.5	10.2	0.2	6.3	12.1	47.6	0.3	1.7	1.6	0.8	0.6	7.5	10.8	33	16
	161	泥质云岩	3 127.8	Eq₃	13.9	9.4	0.5	7.3	16.9	43.1	0.1	1.0	2.7	0.7	4.3	2.5	11.5	41	19
	192	钙芒硝泥质云岩	3 129.1	Eq₃	17.1	9.0	1.0	5.5	6.7	25.4	3.5	0.1	2.1	1.6	27.9	2.8	10.5	79	28
	205	钙芒硝含泥云岩	3 129.6	Eq₃	8.0	7.5	0.4	7.7	4.0	54.1	0.9	1.1	2.0	0.8	13.3	13.4	16.1	79	52
	220	含泥云岩	3 130.1	Eq₃	7.6	12.6	0.9	10.5	3.6	56.7	0.1	3.6	2.0	1.1	1.2	3.8	12.7	98	60
	224	钙芒硝云质泥岩	3 130.3	Eq₃	34.1	20.3	0.9	4.1	5.3	3.7	0.8	1.5	3.7	1.5	24.1	3.8	9.8	14	5
	197	云质泥岩	3 129.3	Eq₃	31.3	22.2	2.8	7.5	11.3	7.0	0.8	0.9	9.5	1.5	5.1	1.6	6.3	14	6
	253	钙芒硝云质泥岩	3 131.4	Eq₃	27.6	15.3	0.3	3.7	3.6	1.9	5.6	0.1	2.8	1.7	37.4	0.7	4.1	21	9
	264	云质泥岩	3 131.7	Eq₃	13.3	8.7	0.9	3.5	2.7	58.1	0.1	8.6	2.3	0.6	1.2	8.2	3.6	21	9
蚌页油2井	39	泥质云岩	2 814.9	Eq₃	21.7	7.8	0.3	7.5	13.2	41.6	0.6	0.7	3.2	0.9	1.5	9.0	9.6	21	9
	109	含泥云岩	2 817.8	Eq₃	28.2	15.1	1.1	7.1	13.1	20.2	0.5	1.4	6.5	1.3	5.5	10.5	11.2	97	27
	1209	钙芒硝泥质云岩	3 572.3	Eq₄	10.7	4.3	0.5	5.4	0.4	13.1	0.5	4.7	0.4	6.1	53.9	1.9	6.4	14	7
	1303	泥质云岩	3 577.6	Eq₄	23.7	11.4	1.1	12.2	17.8	21.2	1.0	5.3	3.1	1.3	1.9	9.4	6.5	17	5
	1359	硬石膏泥质云岩	3 580.1	Eq₄	10.6	5.6	0.7	5.5	2.7	8.9	0.2	2.4	1.3	60.0	0.7	2.5	6.6	17	8
	1389	钙芒硝硬石膏泥质云岩	3 581.2	Eq₄	4.9	3.3	0.9	4.1	3.5	3.3	0.4	5.8	2.0	54.3	17.4	5.2	9.8	17	8

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