基于低温氮气吸附和高压压汞表征潜江凹陷盐间页岩油储层孔隙结构特征

曾宏斌; 王芙蓉; 罗京; 陶涛; 吴世强

doi:10.19509/j.cnki.dzkq.2021.0022

基于低温氮气吸附和高压压汞表征潜江凹陷盐间页岩油储层孔隙结构特征

doi: 10.19509/j.cnki.dzkq.2021.0022

曾宏斌^1,,
王芙蓉^1, ,,
罗京¹,
陶涛¹,
吴世强²

基金项目:

国家自然科学基金重点项目 41830431

国家重大科技专项 2017ZX05049-005

详细信息

作者简介:
曾宏斌(1996-), 男, 现正攻读矿产普查与勘探专业硕士学位, 主要从事非常规油气地质研究。E-mail: zhb258096@163.com

通讯作者:
王芙蓉(1979-), 女, 副教授, 主要从事储层成岩、非常规油气理论研究。E-mail: wfr777@163.com

中图分类号: P618.13
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出版历程
- 收稿日期: 2021-01-30

Characteristics of pore structure of intersalt shale oil reservoir by low temperature nitrogen adsorption and high pressure mercury pressure methods in Qianjiang Sag

摘要

摘要: 为了更全面地表征潜江凹陷潜江组页岩油储层孔隙结构特征，系统选取了距物源不同距离的A井和B井多块页岩样品进行了分析测试，通过场发射扫描电镜、低温氮气吸附和高压压汞实验综合分析了页岩孔隙结构特征；通过对比抽提前后场发射扫描电镜图像、低温氮气吸附和高压压汞实验数据，进一步研究了页岩中滞留烃的赋存空间特征；通过对典型页岩样品的二次压汞实验，探讨了页岩中连通孔隙的孔径分布特征。结果显示：潜江凹陷潜江组页岩油储层孔隙大小为纳米-微米级，孔径2~180 nm的黏土矿物层间孔和白云石晶间孔是该区发育最主要的两种孔隙类型；A井页岩中的滞留烃主要赋存在孔径2~20 nm的黏土矿物层间孔中，滞留烃含量较低，连通孔径主要集中在3~15 nm范围内，B井页岩中的滞留烃赋存在孔径8~100 nm的白云石晶间孔中，滞留烃含量多，连通孔径主要分布在10~130 nm范围内；白云石和黏土矿物的存在都有利于页岩储层储集空间的发育，但远离物源的生物成因的白云石更有利于滞留烃的赋存和可动性。研究成果可以为潜江凹陷页岩油的勘探和开发提供一定的理论支撑。
- 页岩孔隙结构 /
- 高压压汞 /
- 低温氮气吸附 /
- 页岩油储层 /
- 潜江凹陷 /
- 江汉盆地
Abstract: In order to more comprehensively characterize the pore structure characteristics of Qianjiang Formation shale oil reservoir in Qianjiang Sag, several shale samples from Well A and Well B with different distances from the source were systematically selected for analyzing and testing, and the pore structure characteristics of shale were comprehensively analyzed by field emission scanning electron microscope, low temperature nitrogen adsorption and mercury intrusion capillary pressure experiment; Making a further study by comparing the field emission scanning electron microscope images, low-temperature nitrogen adsorption and mercury intrusion capillary pressure experimental data on the occurrence space characteristics of retained hydrocarbons in shale; The pore size distribution of connected pores in shale is discussed through the secondary mercury injection experiments on typical shale samples.This study shows that the pore size of Qianjiang Formation shale oil reservoir in Qianjiang Sag is nanometer micron scale, and 2-180 nm clay mineral interlayer pore and dolomite intergranular pore are the two main pore types in this area; The retained hydrocarbon in Well A shale mainly exists in 2-20 nm clay mineral interlayer pores, the content of retained hydrocarbon is low, and the connected pore size is mainly concentrated in the range of 3-15 nm.The retained hydrocarbon in Well B shale mainly exists in 8-100 nm dolomite intergranular pores, the amount of retained hydrocarbon is large, and the connected pore size is mainly distributed in the range of 10-130 nm.The existence of dolomite and clay minerals is conducive to the development of shale reservoir space, but the biogenic dolomite far away from the source is more conducive to the occurrence and mobility of retained hydrocarbon.The research results can provide theoretical support for the exploration and development of shale oil in Qianjiang Sag.
- shale pore structure /
- high-pressure mercury injection /
- nitrogen adsorption /
- shale oil reservoir /
- Qianjiang Sag /
- Jianghan Basin

HTML全文

图 1 潜江凹陷页岩沉积特征及井位分布图^[27]

Figure 1. Sedimentary characteristics and well locations of shale in Qianjiang Sag

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图 2 潜江凹陷Eq3₄¹⁰韵律页岩样品参数及取样深度图

Figure 2. Parameters and sampling depth map of Eq3₄¹⁰ rhythmic shale samples in Qianjiang Sag

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图 3 潜江凹陷Eq3₄¹⁰韵律页岩样品实验流程图

Figure 3. Experimental flow chart of Eq3₄¹⁰ rhythmic shale sample in Qianjiang Sag

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图 4 潜江凹陷Eq3₄¹⁰韵律页岩抽提前后低温氮气吸附-脱附曲线对比图

Figure 4. Comparison of low temperature nitrogen adsorption desorption curves before and after extraction of Eq3₄¹⁰ rhythmic shale in Qianjiang Sag

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图 5 潜江凹陷Eq3₄¹⁰韵律页岩压汞和进汞曲线

Figure 5. Mercury intrusion capillary pressure of Eq3₄¹⁰ rhythmic shale in Qianjiang Sag

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图 6 潜江凹陷Eq3₄¹⁰韵律页岩样品BJH孔径分布图

Figure 6. Pore size distribution of Eq3₄¹⁰ rhythm shale samples by BJH formula in Qianjiang Sag

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图 7 潜江凹陷Eq3₄¹⁰韵律页岩样品高压压汞孔径分布图

Figure 7. Pore size distribution of Eq3₄¹⁰ rhythm shale samples by mercury intrusion capillary pressure in Qianjiang Sag

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图 8 潜江凹陷Eq3₄¹⁰韵律页岩样品低温氮气吸附和高压压汞孔径分布拼接图

Figure 8. Stitching map of pore size distribution of low temperature nitrogen adsorption and mercury intrusion capillary pressure of Eq3₄¹⁰ rhythmic shale samples in Qianjiang Sag

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图 9 潜江凹陷Eq3₄¹⁰韵律页岩样品抽提前后不同孔径下的比孔容分布曲线

Figure 9. Distribution curves of specific pore volume of before and after extraction of the Eq3₄¹⁰ rhythmic shale samples with different pore sizes in Qianjiang Sag

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图 10 潜江凹陷Eq3₄¹⁰韵律页岩抽提前后高压压汞孔径分布曲线

Figure 10. Distribution curves of pore size of before and after extraction of Eq3₄¹⁰ rhythmic shale samples by mercury intrusion capillary pressure in Qianjiang Sag

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图 11 多次压汞表征页岩孔隙连通性图

Figure 11. Characterization of shale pore connectivity by multiple mercury intrusion capillary pressure

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图 12 潜江凹陷Eq3₄¹⁰韵律页岩样品场发射扫描电镜图像

a.A井，白云石粒间孔，孔径最大为2 μm，未见滞留烃，黏土矿物层间孔孔径多小于200 nm，可见滞留烃；b.A井，黏土矿物层间孔，可见滞留烃富集，孔径最大为500 nm，大部分小于200 nm；c.B井，白云石晶间孔，可见大量滞留烃；d.B井，白云石晶间孔，孔径最大2 μm，部分小于200 nm，可见滞留烃富集；e.B井，抽提前，滞留烃赋存在碳酸盐晶间孔、粒间孔和黏土矿物层间孔中；f.B井，抽提后，孔隙周围有盐类物质析出

Figure 12. Field emission scanning electron microscope images of Eq3₄¹⁰ rhythmic shale samples in Qianjiang Sag

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图 13 潜江凹陷Eq3₄¹⁰韵律页岩样品矿物体积分数与孔隙体积、滞留烃量关系图

Figure 13. Relationships between mineral content, pore volume and retained hydrocarbon of Eq3₄¹⁰ rhythmic shale samples in Qianjiang Sag

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表 1 潜江凹陷Eq3₄¹⁰韵律页岩样品矿物组成和地球化学参数

Table 1. Mineral composition and geochemical parameters of Eq3₄¹⁰ rhythmic shale in Qianjiang Sag

井位		白云石φ_B/%	黏土矿物φ_B/%	w(TOC)/%	S₁/(mg·g^-1)
A	分布范围	3.03~31.9	10.16~37.90	0.77~2.87	0.83~5.87
A	平均值	19.08	20.26	1.73	3.63
B	分布范围	11.30~52.15	0~19.60	1.15~2.44	3.12~9.85
B	平均值	35.03	11.38	1.79	6.59

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表 2 一次和二次压汞孔隙结构参数

Table 2. First and second mercury intrusion capillary pressure of pore structure parameters

样品		A-4	B-3	B-4	B-5
孔隙度/%	一次	4.590 8	18.025 0	17.472 2	18.728 9
孔隙度/%	二次	1.476 9	8.636 2	8.941 1	6.978 6
总孔容/(cm³·g^-1)	一次	0.019 1	0.086 7	0.081 4	0.086 7
总孔容/(cm³·g^-1)	二次	0.004 9	0.026 4	0.027 2	0.030 3

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