湖相泥页岩储层脆性评价及影响因素分析——以苏北盆地海安凹陷曲塘次凹泥页岩为例

孙彪; 刘小平; 舒红林; 焦创赟; 王高成; 刘梦才; 罗瑀峰

doi:10.11781/sysydz2021061006

湖相泥页岩储层脆性评价及影响因素分析——以苏北盆地海安凹陷曲塘次凹泥页岩为例

doi: 10.11781/sysydz2021061006

孙彪^{1, 2,},
刘小平^{1, 2, ,},
舒红林³,
焦创赟⁴,
王高成³,
刘梦才³,
罗瑀峰³

1.
油气资源与探测国家重点实验室, 北京 102249
2.
中国石油大学(北京) 地球科学学院, 北京 102249
3.
中国石油浙江油田分公司, 杭州 310013
4.
中国石油长庆油田分公司勘探开发研究院, 西安 710018

基金项目:

国家自然科学基金项目 42072150

国家自然科学基金项目 41372144

国家科技重大专项 2017ZX05049001-008

详细信息

作者简介:
孙彪(1995-), 男, 博士研究生, 从事非常规油气地质研究。E-mail: 719997758@qq.com

通讯作者:
刘小平(1971-), 男, 博士, 教授, 从事石油地质教学研究。E-mail: liuxiaoping@cup.edu.cn

中图分类号: TE122.24
计量
- 文章访问数: 470
- HTML全文浏览量: 162
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- 被引次数: 0
出版历程
- 收稿日期: 2020-10-28
- 修回日期: 2021-10-14
- 刊出日期: 2021-11-28

Evaluation and influencing factors for brittleness of lacustrine shale reservoir: a case study of Qutang Sub-Sag, Subei Basin

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
2.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
3.
PetroChina Zhejiang Oilfield Company, Hangzhou, Zhejiang 310013, China
4.
Petroleum Exploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

摘要

摘要: 为准确评价湖相泥页岩脆性及探究其影响因素，选取了苏北盆地海安凹陷曲塘次凹古近系阜宁组二段湖相泥页岩样品，利用全岩X衍射分析、有机碳测定、镜质体反射率测定、扫描电镜、三轴岩石力学等实验技术手段，分析了样品的矿物成分、地球化学、储集空间等特征；并采用测井、强度参数、矿物成分以及应力—应变曲线变化特征等方法评价其脆性特征。结果表明，页岩主要为云质页岩和灰质页岩，脆性矿物含量较高；有机碳含量平均为1.25%，且已达到成熟阶段；储集空间由特低孔和裂缝组成；应力应变关系曲线表现出较强的脆性特征；不同方法的脆性评价结果存在一定差异，基于弹性参数与矿物组分评价脆性比基于强度参数的应用效果更佳，但每种方法都存在一定局限性。阜二段页岩脆性受矿物组分、有机质丰度、储集空间发育程度等共同影响，随着白云石含量、有机质成熟度、裂缝发育程度的增加，储层脆性随之增加；而方解石含量、有机质丰度、孔隙度的增加则会减弱储层脆性。
- 脆性评价 /
- 湖相泥页岩 /
- 阜宁组 /
- 古近系 /
- 海安凹陷 /
- 苏北盆地
Abstract: In order to accurately evaluate the brittleness of lacustrine shale and explore its influencing factors, the mineral compositions, geochemical characteristics and reservoir spaces of the lacustrine shale samples from the second member of Paleogene Funing Formation in the Qutang Sub-Sag, Hai'an Sag, Subei Basin were analyzed by means of whole-rock diffraction analysis, the measurement of organic carbon content (TOC) and vitrinite reflectance, scanning electron microscope (SEM) and triaxial rock mechanics experiment, combining with well logging, strength parameters, mineral compositions and stress-strain curves. The shale is mainly dolomitic and calcite ones with a high content of brittle minerals. The average TOC value is 1.25%, indicating for a mature stage. The reservoir space is composed of ultra-low pores and fractures. The stress-strain curves show a strong characteristic of brittleness. The brittleness evaluation results of different methods have certain differences. The results based on elastic parameters and mineral components are more reliable than that based on strength parameters although each method has its own limitations. The mineral compositions, organic matter abundance, and the degree of storage space development affect the brittleness of shale in the second member of Funing Formation. With the increasing of dolomite content, organic maturity and fracture development, the brittleness of the reservoir increases. The increase in calcite content, organic matter abundance and porosity will weaken the brittleness of the reservoir.
- brittleness evaluation /
- lacustrine shale /
- Funing Formation /
- Paleogene /
- Hai'an Sag /
- Subei Basin

HTML全文

图 1 苏北盆地构造单元划分(a)、曲塘次凹位置(b)及J19井取样位置(c)

Figure 1. Tectonic division of Subei Basin (a), location of Qutang Sub-Sag (b) and samples' location in well J19 (c)

下载: 全尺寸图片幻灯片

图 2 苏北盆地海安凹陷曲塘次凹J19井阜宁组二段泥页岩扫描电子显微镜照片

Figure 2. SEM images of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 3 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩样品应力—应变曲线

围压40 MPa。

Figure 3. Stress-strain curves of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

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图 4 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩样品三轴压缩试验后的破裂形态

Figure 4. Rupture geometry after triaxial compression of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

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图 5 苏北盆地海安凹陷曲塘次凹J19井阜二段云质泥页岩K值与脆性指数的关系

Figure 5. Correlations between K values and brittleness index of dolomitic shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

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图 6 苏北盆地海安凹陷曲塘次凹J19井阜二段灰质泥页岩K值与脆性指数的关系

Figure 6. Correlations between K values and brittleness index of limy shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

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图 7 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩K与矿物组分含量的关系

Figure 7. Correlations between K values and mineral compositions of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 8 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩样品脆性与TOC和R_o的相关性

Figure 8. Correlations between K values and TOC and R_o of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

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图 9 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩样品脆性与孔隙度的关系

Figure 9. Correlations between brittleness and porosity of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

下载: 全尺寸图片幻灯片

表 1 苏北盆地海安凹陷曲塘次凹J19井阜宁组二段泥页岩样品矿物组成

Table 1. Mineral components of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

样品编号	深度/m	岩性	黏土矿物/%	石英/%	钾长石/%	斜长石/%	方解石/%	白云石/%	铁白云石/%	脆性矿物/%
1	3 819.66	含灰泥页岩	40	28	1	6	20	0	0	55
2	3 842.32	灰质泥页岩	36	4	1	7	28	0	1	61
3	3 853.15	含灰质泥页岩	40	13	1	7	14	4	17	56
4	3 868.45	含云泥页岩	39	18	4	9	5	2	12	50
5	3 889.32	泥质云岩	17	12	2	10	5	8	35	72
6	3 895.00	云质泥页岩	28	13	1	9	9	2	21	55

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表 2 苏北盆地海安凹陷曲塘次凹J19井阜宁组二段泥页岩地化和储层特征

Table 2. Geochemical characteristics of shale and reservoir features in second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

样品编号	深度/m	岩性	ω(TOC)/%	R_o/%	孔隙度/%
1	3 819.66	含灰泥页岩	2.25	1.10	3.36
2	3 842.32	灰质泥页岩	2.29	0.88
3	3 853.15	含灰质泥页岩	0.84	1.06	1.47
4	3 868.45	含云泥页岩	0.73	1.09	2.57
5	3 889.32	泥质云岩	0.53	1.21	1.07
6	3 895.00	云质泥页岩	0.83	1.01

下载: 导出CSV

表 3 苏北盆地海安凹陷曲塘次凹J19井阜宁组二段泥页岩样品脆性特征

Table 3. Brittleness characteristics of shale samples from second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

编号	深度/m	岩性	直径/mm	长度/mm	抗压强度/MPa	杨氏模量/GPa	泊松比	弹性模量M/GPa	峰后模量E_x/GPa
1	3 819.66	含灰泥页岩	24.4	49.7	274.76	26.86	0.31	0.24	-0.46
2	3 842.32	灰质泥页岩	24.5	49.5	288.64	30.61	0.35	0.27	-1.38
3	3 853.15	含灰质泥页岩	24.5	32.2	216.89	25.37	0.30	0.24	-0.23
4	3 868.45	含云泥页岩	24.6	46.4	354.77	36.36	0.30	0.33	-0.35
5	3 889.32	泥质云岩	24.4	36.8	315.44	30.33	0.22	0.25	-0.06
6	3 895.00	云质泥页岩	24.4	53.4	259.91	31.34	0.27	0.21	-0.46

下载: 导出CSV

表 4 苏北盆地海安凹陷曲塘次凹J19井阜二段泥页岩样品不同方法脆性指数评价

Table 4. Brittleness index of shale samples by different methods, second member of Funing Formation, well J19, Qutang Sub-Sag, Haian Sag, Subei Basin

编号	深度/m	岩性	BI₁	BI₂	BI₃	K
1	3 819.66	含灰泥页岩	22.94	68.69	55.00	2.91
2	3 842.32	灰质泥页岩	23.82	72.16	61.00	6.07
3	3 853.15	含灰质泥页岩	20.96	54.22	56.00	1.97
4	3 868.45	含云泥页岩	71.32	88.69	50.00	2.06
5	3 889.32	泥质云岩	72.55	78.86	72.00	1.26
6	3 895.00	云质泥页岩	56.19	64.98	55.00	3.20

下载: 导出CSV

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