江汉盆地潜江凹陷潜江组盐间页岩油储层特征研究——以潜3<sup>4</sup>-10韵律为例

刘心蕊; 吴世强; 陈凤玲; 张亮; 杜小娟; 管文静; 梁文川

doi:10.11781/sysydz202102268

江汉盆地潜江凹陷潜江组盐间页岩油储层特征研究——以潜3⁴-10韵律为例

doi: 10.11781/sysydz202102268

1.
中国地质大学(武汉)资源学院, 武汉 430074
2.
中国石化江汉油田分公司, 武汉 430035

基金项目:

国家科技重大专项 2017ZX05049—005

详细信息

作者简介:
刘心蕊(1997—)，女，硕士，从事地质勘查及地质勘探研究。E-mail：835534721@qq.com

通讯作者:
吴世强(1979—)，男，硕士，高级工程师，从事页岩油综合研究。E-mail：wusq.jhyt@sinopec.com

中图分类号: TE122.23
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出版历程
- 收稿日期: 2020-04-22
- 修回日期: 2021-03-08
- 刊出日期: 2021-03-28

Characteristics of reservoirs for inter-salt shale oil of Qianjiang Formation, Qianjiang Sag, Jianghan Basin: a case study of the Eq₃⁴-10 rhythm

1.
School of Earth Resources, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
2.
Research Institute of Exploration and Development, SINOPEC Jianghan Oilfield Branch Company, Wuhan, Hubei 430223, China

摘要

摘要: 江汉盆地始新统潜江组盐间页岩油是近年来研究的热点和难点。为了明确盐间页岩储层岩相及其储集物性，综合运用岩心观测、岩石薄片鉴定、X衍射、高压压汞和页岩孔渗等资料，对潜江凹陷潜江组盐间页岩油储层岩相发育特征及其对储集物性的影响进行了研究。该区盐间页岩油储层主要包括富碳纹层状泥质白云岩相、富碳纹层状云/灰质泥岩相和钙芒硝充填富碳纹层状云质泥岩相3种不同类型的岩相类型，前2种岩相的孔隙度明显高于后者。不同岩相孔径分布差异明显，富碳纹层状泥质白云岩相以孔径大于41 nm的孔隙为主，中值孔喉半径为219 nm；而富碳纹层状云/灰质泥岩相和钙芒硝充填富碳纹层状云质泥质相则以孔径小于41 nm的孔隙为主，中值孔喉半径为21 nm。富碳纹层状泥质白云岩相岩性均一，具有良好的储集空间和较大的孔喉结构，页岩储层中的含油性较高，为盐间页岩油储层中的优势岩相，是研究区最有利的页岩油勘探目标。
- 页岩油 /
- 盐间页岩 /
- 岩相特征 /
- 储集物性 /
- 潜江组 /
- 潜江凹陷 /
- 江汉盆地
Abstract: The inter-salt shale oil of the Eocene Qianjiang Formation in the Jianghan Basin is a hot and difficult research target in recent years. In order to clarify the lithofacies and physical properties of the inter-salt shale reservoirs, based on core observation, thin section observation, X-ray diffraction, high-pressure mercury intrusion and shale porosity and permeability analyses, a case study was carried out for the Qianjiang Formation in the Qianjiang Sag of Jianghan Basin. Results showed that there were three types of lithofacies, including carbonaceous laminar argillaceous dolomites, carbonaceous lamellar dolomitic/lime mudstones and carbonaceous lamellar dolomitic mudstones filled with glauberites. The porosities of the first two lithofacies were significantly higher than that of the latter. The pore size distribution of different lithofacies showed that the carbonaceous laminar argillaceous dolomites were dominated by pores with radius greater than 41 nm, and the median pore-throat radius was 219 nm, while the other two facies were dominated by pores with pore radius less than 41 nm and the median pore-throat radius was 21 nm. The carbonaceous laminar argillaceous dolomites were indicated to be homogeneous in lithology. As reservoir, they have good reservoir space, larger pore-throat structure and higher oil content, and was the dominant facies in the inter-salt shale oil reservoir and is promising to be the most favorable shale oil exploration target in the study area.
- shale oil /
- inter-salt shale /
- lithofacies characteristics /
- reservoir properties /
- Qianjiang Formation /
- Qianjiang Sag /
- Jianghan Basin

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图 1 江汉盆地潜江凹陷构造位置与剖析井分布

Figure 1. Tectonic units and well locatins in Qianjiang Sag, Jianghan Basin

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图 2 江汉盆地潜江凹陷潜3⁴-10韵律盐间页岩层主要矿物组成和岩相划分方案

Figure 2. Major mineral composition and lithofacies division of inter-salt shales in Eq₃⁴-10 rhythm, Qianjiang Formation, Qianjiang Sag, Jianghan Basin

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图 3 江汉盆地潜江凹陷W99井潜江组潜3⁴-10盐间页岩岩相划分

Figure 3. Lithofacies division of inter-salt shales in Eq₃⁴-10 rhythm, Qianjiang Formation, well W99, Qianjiang Sag, Jianghan Basin

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图 4 江汉盆地潜江凹陷潜江组盐间页岩岩心扫描照片

图版上部为白光照片，下部为荧光照片。a.纹层状泥晶白云岩(2 813.7~2 816.2 m)，纹层状灰质/云质泥岩(2 816.2~2 819.3 m)；b.纹层状灰质/云质泥岩(2 819.3~2 820.43 m)，含钙芒硝条带纹层状云质泥岩(2 820.43~2 823.78 m)

Figure 4. White light and fluorescence scanning photos of inter-salt shales in Qianjiang Formatiom, Qianjiang Sag, Jianghan Basin

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图 5 江汉盆地潜江凹陷潜江组盐间页岩主要矿物组构、结构特征

a.纹层状泥晶白云岩(BYY2井，潜3⁴-10，2 818.0 m)；b.纹层状白云质泥岩(W99井，潜3⁴-10，1 679.0 m)；c.纹层状泥晶白云岩(W99井，潜3⁴-10，1 678.1 m)；d.钙芒硝充填纹层状白云质泥岩(W99井，潜3⁴-10，1 688.2 m)

Figure 5. Petrographic structure of inter-salt shales in Qianjiang Formation, Qianjiang Sag, Jianghan Basin

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图 6 江汉盆地潜江凹陷王99井潜江组潜3⁴-10韵律盐间页岩岩相与孔隙度关系

Figure 6. Relationship between lithofacies and porosity of inter-salt shales in Eq₃⁴-10 rhythm, Qianjiang Formation, well W99, Qianjiang Sag, Jianghan Basin

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图 7 江汉盆地潜江凹陷潜江组不同岩相储层孔径表征

Figure 7. Distribution of pore size of shale reservoirs with different lithofacies in Qianjiang Formation, Qianjiang Sag, Jianghan Basin

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图 8 江汉盆地潜江凹陷潜江组不同岩相游离烃含量分布

Figure 8. Free hydrocarbon contents of different lithofacies in Qianjiang Formation, Qianjiang Sag, Jianghan Basin

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表 1 江汉盆地潜江凹陷潜江组潜3⁴-10韵律盐间页岩层矿物成分统计

Table 1. Mineral composition of inter-salt shales in Eq₃⁴-10 rhythm, Qianjiang Formation, Qianjiang Sag, Jianghan Basin %

井号	黏土矿物	硬石膏	石英	钾长石	斜长石	方解石	白云石	菱铁矿	黄铁矿	石盐	钙芒硝
BX7	$ \frac{0.6 \sim 39.1}{20.7 /(72)}$	$\frac{0.3 \sim 17.1}{1.3 /(72)} $	$ \frac{3.8 \sim 15.6}{8.2 /(72)} $	$\frac{0.5 \sim 4.4}{1.1 /(72)} $	$\frac{1.6 \sim 7.1}{4.3 /(72)} $	$ \frac{2.7 \sim 50.8}{22.6 /(72)}$	$\frac{12.1 \sim 73.8}{31.8 /(72)} $	$ \frac{0.1 \sim 13.1}{0.6 /(72)}$	$\frac{1.9 \sim 12.6(72)}{7.1 /(72)} $	$ \frac{0.1 \sim 0.3}{0.2 /(72)}$	$ \frac{0.4 \sim 5.8}{2.2 /(72)}$
BYY1	$ \frac{0.1 \sim 33.3}{12.2 /(117)}$	$ \frac{0.4 \sim 41.2}{3.4 /(117)}$	$ \frac{0.1 \sim 15}{7.3 /(117)}$	$ \frac{0.2 \sim 10.6}{0.7 /(117)}$	$\frac{1.9 \sim 20}{6.7 /(117)} $	$ \frac{0.3 \sim 65.1}{10.9 /(117)}$	$\frac{2.0 \sim 70.3}{28.7 /(117)} $	$ \frac{0.0}{(117)}$	$\frac{1.0 \sim 28.2}{4.3(117)} $	$ \frac{0.6 \sim 92}{3.7(117)}$	$\frac{1.4 \sim 91.3}{18.5(117)} $
BYY2	$ \frac{1.5 \sim 42.3}{12.4 /(128)}$	$ \frac{0.1 \sim 0.6}{0.2 /(128)}$	$\frac{1.9 \sim 16.4}{6.7 /(128)} $	$\frac{0.2 \sim 9}{0.5 /(128)} $	$\frac{2.7 \sim 15.5}{7.1 /(128)} $	$ \frac{1.0-45.0}{9.8 /(128)}$	$ \frac{3.7 \sim 74.3}{30.9 /(128)}$	$\frac{0.0}{(128)} $	$\frac{1.1 \sim 32.8}{5.4(128)} $	$\frac{0.6 \sim 63.2}{3.0(128)} $	$ \frac{3.0 \sim 84.1}{23.4(127)}$
W99	$\frac{5.7 \sim 54.7}{26.7 /(54)} $	$\frac{0.0}{(57)} $	$\frac{2.6 \sim 17.6}{10.8 /(57)} $	$\frac{0.1 \sim 2.2}{0.3 /(57)} $	$\frac{0.2 \sim 5.6}{1.8 /(57)} $	$ \frac{1.5 \sim 39.8}{9.7 /(57)}$	$ \frac{2.8 \sim 76.9}{23.6 /(57)}$	$\frac{0.0}{(57)} $	$ \frac{1.5 \sim 9.3}{3.2(57)}$	$\frac{0.8 \sim 6.3}{1.5(57)} $	$\frac{3.6 \sim 82.5}{22.3(57)} $
平均	16.0	1.4	7.8	0.7	5.7	12.6	29.3	0.1	5.1	2.5	17.6
注：表中数据意义为$\frac{ { 最小值 \sim 最大值 }}{\text { 平均值(样品数) }} $。

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表 2 江汉盆地潜江凹陷潜江组潜3⁴-10韵律盐间页岩储集物性数据

Table 2. Reservoir properties of inter-salt shales in Eq₃⁴-10 rhythm, Qianjiang Formation, Qianjiang Sag, Jianghan Basin

井号	孔隙度/%	渗透率/10^-3 μm²
BX7	1.9~9.1/6.0(18)	0.06~1.6/0.55(18)
BYY1HF	4.1~10.2/8.5(65)	0.13~3.6/1.5(40)
BYY2	5.1~18/11.9(78)	0.23~5.1/2.18(47)
W99	14.2~31.3/22.(4)	0.7~1.3/1.0(2)
注：表中数据意义为：最小值~最大值/平均值(样品数)。

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