川东南林滩场五峰组—龙马溪组深层页岩气储层脆性定量评价

冯少柯; 熊亮; 尹帅; 董晓霞; 魏力民

doi:10.11781/sysydz2025030742

川东南林滩场五峰组—龙马溪组深层页岩气储层脆性定量评价

doi: 10.11781/sysydz2025030742

冯少柯^{1, 2,},
熊亮^1, ,,
尹帅³,
董晓霞¹,
魏力民¹

1.
中国石化西南油气分公司, 成都 610081
2.
成都理工大学, 成都 610059
3.
西安石油大学地球科学与工程学院, 西安 710065

基金项目:

中国石化科技部项目 P21042-1

中国石化科技部项目 P23221

详细信息

作者简介:
冯少柯(1995—)，男，博士，主要从事非常规油气勘探开发、储层测井评价工作。E-mail: fsk962359370@163.com

通讯作者:
熊亮(1975—)，男，研究员，主要从事非常规油气勘探开发工作。E-mail: xiongliang.xnyq@sinopec.com

中图分类号: TE122.2
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- 文章访问数: 10
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- 被引次数: 0
出版历程
- 收稿日期: 2024-06-28
- 修回日期: 2025-05-22
- 刊出日期: 2025-07-28

Quantitative evaluation of brittleness of deep shale gas reservoirs of Wufeng- Longmaxi formations in Lintanchang area, southeastern Sichuan Basin

FENG Shaoke^{1, 2
,},
XIONG Liang^{1
, ,},
YIN Shuai³,
DONG Xiaoxia¹,
WEI Limin¹

1.
SINOPEC Southwest Oil and Gas Branch Company, Chengdu, Sichuan 610081, China
2.
Chengdu University of Technology, Chengdu, Sichuan 610059, China
3.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

摘要

摘要: 随着深层页岩气储层岩石塑性的增加，其脆性特征难以通过传统评价方法进行准确表征。以川东南林滩场上奥陶统五峰组—下志留统龙马溪组一段深层页岩气储层为例，开展页岩样品的三轴岩石力学实验和断裂韧性实验，再结合深度学习对储层脆性进行综合定量评价。岩石力学实验和断裂韧性实验结果表明，随温度和压力的升高，页岩样品杨氏模量、泊松比和抗压强度均有所增加；①号层样品的脆性明显低于③号层样品；脆性较好的页岩样品应力—应变曲线波动特征明显，表现出非线性变形特征，残余应变值较小；页岩样品的断裂韧度与脆性矿物含量关系较为密切，纹层垂直于页理方向的样品Ⅰ型和Ⅱ型断裂韧度值较低。在考虑页岩物质组分特征、三轴岩石力学特征和断裂韧性特征的前提下，以脆性指数B_el和B_mine3、断裂韧性指数I_KIC为数据基础，建立深度学习权重分析模型，累积风险值小于5，模型可靠性较强。根据模型建立综合脆性指数B，与岩心脆性测定值B_S的相关性得到显著提高(R=0.852 7)。脆性定量评价结果对深层页岩储层纵向剖面的脆性特征进行了真实反映，研究区五峰组—龙一段③号层底部和②号层储层脆性较好，断裂韧性指数较小，为后期勘探开发的优选目的层。
- 深层页岩储层 /
- 三轴岩石力学 /
- 断裂韧性 /
- 深度学习权重分析法 /
- 综合脆性指数 /
- 五峰组—龙马溪组 /
- 四川盆地
Abstract: With the increase in rock plasticity of deep shale gas reservoirs, their brittleness characteristics become difficult to be accurately characterized using traditional evaluation methods. Taking the deep shale gas reservoirs from the upper Ordovician Wufeng Formation to the first member of Lower Silurian Longmaxi Formation in the Lintanchang area of the southeastern Sichuan Basin as a case study, triaxial rock mechanics and fracture toughness experiments on shale samples were conducted. Based on the experimental results, a comprehensive quantitative evaluation of reservoir brittleness was carried out using deep learning. The experimental results showed that with the increasing temperature and pressure, the Young's modulus, Poisson's ratio, and compressive strength of the shale samples all increased. The brittleness of shale samples from layer ① was significantly lower than that of samples from layer ③. Shale samples with better brittleness exhibited obvious fluctuations in the stress-strain curves, showed nonlinear deformation characteristics, and had relatively small residual strain values. The fracture toughness of shale samples was closely related to the content of brittle minerals, and the fracture toughness values of type Ⅰ and type Ⅱ samples with laminations perpendicular to bedding planes were relatively lower. Based on the shale characteristics of mineral composition, triaxial rock mechanics, and fracture toughness, a deep learning weight analysis model was developed using brittleness indices B_el and B_mine3 and fracture toughness index I_KIC as data inputs.The cumulative risk value was less than 5, indicating the high reliability of the model.A comprehensive brittleness index B was established based on the model, and its correlation with the measured brittleness index B_S of core samples was significantly improved (R=0.852 7). The quantitative brittleness evaluation results truly reflect the vertical profile of brittleness characteristics in deep shale reservoirs. The reservoirs at layer ③ bottom and layer ② in the Wufeng-Longmaxi formations of the study area exhibit relatively better brittleness and lower fracture toughness index, making them preferred target layers for future exploration and development.
- deep shale reservoir /
- triaxial rock mechanics /
- fracture toughness /
- deep learning weight analysis method /
- comprehensive brittleness index /
- Wufeng-Longmaxi formations /
- Sichuan Basin
注释:

利益冲突声明/Conflict of Interests

作者熊亮是本刊编委会成员，未参与本文的同行评审或决策。

The author XIONG Liang is an Editorial Board Member of this journal, and he did not take part in peer review or decision making of this article.

作者贡献/Authors’Contributions

冯少柯参与文章整体思路设计和论文写作；熊亮和尹帅参与论文结构搭建；董晓霞和魏力民参与论文修改。所有作者均阅读并同意最终稿件的提交。

FENG Shaoke participated in the writing and overall conceptualization of the paper. XIONG Liang and YIN Shuai participated in the construction of the paper structure. DONG Xiaoxia and WEI Liming participated in the paper revision. All authors have read the final version of the paper and consented to its submission.

HTML全文

图 1 四川盆地东南区域地层分布及研究区位置图(a)和研究区五峰组—龙马溪组构造及埋深分布图(b)

Figure 1. Stratigraphic distribution of southeastern Sichuan Basin and location of study area (a), and structure and burial depth distribution of Wufeng-Longmaxi formations in study area (b)

下载: 全尺寸图片幻灯片

图 2 四川盆地东南林滩场地区五峰组—龙马溪组一段深层页岩样品不同温压下的应力—应变曲线

a.第一组，L3井龙一段③号层，4 120.70 m；b.第五组，L3井龙一段①号层，4 134.45 m。

Figure 2. Stress-strain curves of deep shale samples under different temperatures and pressures from Wufeng Formation to the first member of Longmaxi Formation in Lintanchang area, southeastern Sichuan Basin

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图 3 四川盆地东南林滩场地区五峰组—龙马溪组一段深层页岩样品脆性指数相关性分析

a.B_S与B_mine1、B_mine2相关性分析；b. B_S与B_mine3、B_el相关性分析

Figure 3. Correlation of brittleness index for deep shale samples from Wufeng Formation to the first member of Longmaxi Formation in Lintanchang area, southeastern Sichuan Basin

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图 4 B_mine3、B_el和I_KIC的累积概率分布图(a)和三维残差分布图(b)

Figure 4. Cumulative probability distribution (a) and three-dimensional residual distribution (b) of B_mine3, B_el, and I_KIC

下载: 全尺寸图片幻灯片

图 5 深度学习权重分析模型(a)和最佳性能分析图(b)

Figure 5. Deep learning weight analysis model (a) and best performance analysis chart (b)

下载: 全尺寸图片幻灯片

图 6 相邻点权重分布图(a)和权重分析命中点数图(b)

Figure 6. Weight distribution of adjacent points (a) and weight analysis hit point chart (b)

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图 7 累积风险图(a)和B_S与综合脆性指数B相关性图(b)

Figure 7. Cumulative risk chart (a) and correlation between B_S and comprehensive brittleness index B (b)

下载: 全尺寸图片幻灯片

图 8 四川盆地东南林滩场地区L3井五峰组—龙马溪组一段深层页岩脆性评价综合柱状图

Figure 8. Comprehensive column chart of brittleness evaluation for deep shale from Wufeng Formation to the first member of Longmaxi Formation in well L3 of Lintanchang area, southeastern Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 四川盆地东南林滩场地区L3井页岩样品三轴岩石力学实验结果

Table 1. Experimental results of triaxial rock mechanics of shale samples from well L3 in Lintanchang area, southeastern Sichuan Basin

样品号	小层	深度/m	岩性	石英+长石/%	碳酸盐矿物/%	黏土矿物/%	围压/MPa	温度/℃	抗压强度/MPa	杨氏模量/MPa	泊松比
L3-4	③	4 120.70	黑色硅质页岩	53.5	14.8	30.6	15	30	150.42	32.97	0.189
L3-5	③	4 120.70					30	60	187.16	33.03	0.229
L3-6	③	4 120.70					50	90	219.26	36.05	0.241
L3-7	③	4 122.76	黑色硅质页岩	52.5	12.6	17.7	15	30	163.59	29.54	0.218
L3-8	③	4 122.76					30	60	186.89	31.19	0.235
L3-9	③	4 122.76					50	90	230.98	32.78	0.251
L3-16	②	4 127.50	黑色硅质页岩	52.5	10.8	18.8	15	30	236.67	30.94	0.213
L3-17	②	4 127.50					30	60	288.84	31.08	0.231
L3-18	②	4 127.50					50	90	339.94	31.83	0.269
L3-13	①	4 132.00	灰黑色含钙硅质页岩	36.2	30.6	30.4	15	30	261.51	31.36	0.209
L3-14	①	4 132.00					30	60	281.96	32.73	0.234
L3-15	①	4 132.00					50	90	387.65	34.43	0.237
L3-19	①	4 134.45	灰黑色含钙硅质页岩	35.9	24.9	36.1	15	30	192.86	30.70	0.214
L3-20	①	4 134.45					30	60	255.53	35.76	0.251
L3-21	①	4 134.45					50	90	316.96	38.71	0.282

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表 2 四川盆地东南林滩场地区龙马溪组深层页岩样品断裂韧性实验结果

Table 2. Experimental results of fracture toughness tests on deep shale samples from Longmaxi Formation in Lintanchang area, southeastern Sichuan Basin

井名	深度/m	小层	岩性	石英+长石/%	碳酸盐矿物/%	黏土矿物/%	与页理方向的关系	K_Ⅰ/MPa·m^1/2	K_Ⅱ/MPa·m^1/2
L2	3 011.00	③	黑色硅质页岩	40.9	14.9	36.1	平行	0.145
L2	3 016.58	④	黑色硅质页岩	42.4	16.2	29.6	平行		0.369
L3	4 122.76	③	黑色硅质页岩	52.5	12.6	17.7	平行	0.241	0.285
	4 126.41	③	黑色硅质页岩	55.6	13.4	19.9	垂直	0.212	0.243
	4 127.30	②	黑色硅质页岩	50.2	23.9	20.6	垂直	0.412	0.697
	4 128.20	②	黑色硅质页岩	49.5	25.7	18.5	平行	0.538	0.819
L4	3 907.54	③	黑色硅质页岩	52.6	15.9	25.9	垂直	0.483	0.612
	3 905.31	③	黑色硅质页岩	49.3	17.1	23.8	平行	0.584	0.635
	3 917.57	①	灰黑色含钙硅质页岩	40.2	29.5	28.1	垂直	0.526	0.651
	3 917.79	①	灰黑色含钙硅质页岩	36.4	27.6	33.6	平行	0.582	0.705
L5	2 877.49	③	黑色硅质页岩	60.2	11.2	14.1	垂直	0.515	0.712
	2 878.89	③	黑色硅质页岩	64.2	15.6	12.6	平行	0.631	0.841
	2 880.76	②	黑色硅质页岩	51.3	24.4	22.6	垂直	0.566	0.832
	2 881.59	②	黑色硅质页岩	49.1	25.9	18.7	平行	0.728	0.937
注：K_Ⅰ和K_Ⅱ分别代表Ⅰ型断裂韧度和Ⅱ型断裂韧度。

下载: 导出CSV

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