四川盆地天宫堂地区下志留统龙马溪组天然裂缝特征及形成期次

李林豪; 范存辉; 赵圣贤; 刘绍军; 徐飞; 聂珊; 余亚伟

doi:10.11781/sysydz202403472

四川盆地天宫堂地区下志留统龙马溪组天然裂缝特征及形成期次

doi: 10.11781/sysydz202403472

李林豪^{1, 2,},
范存辉^{1, 2, ,},
赵圣贤³,
刘绍军³,
徐飞^{1, 2},
聂珊^{1, 2},
余亚伟^{1, 2}

1.
西南石油大学油气藏地质及开发工程全国重点实验室, 成都 610500
2.
西南石油大学地球科学与技术学院, 成都 610500
3.
中国石油西南油气田分公司页岩气研究院, 成都 610051

基金项目:

油气藏地质及开发工程全国重点实验室开放基金“差异构造—热演化过程及对页岩气富集保存的影响机理” PLN2023-31

中国石油重大工程技术现场试验项目“深层页岩气地质综合评价技术现场试验” 2019F-31-01

详细信息

作者简介:
李林豪(1999—)，男，硕士生，从事构造地质研究。E-mail: lilinhao0818@163.com

通讯作者:
范存辉(1980—)，男，博士，副教授，从事非常规油气储层表征与预测、构造解析、裂缝评价等研究。E-mail: fanchswpi@163.com

中图分类号: TE122.2
计量
- 文章访问数: 152
- HTML全文浏览量: 237
- PDF下载量: 33
- 被引次数: 0
出版历程
- 收稿日期: 2023-05-31
- 修回日期: 2024-03-14
- 刊出日期: 2024-05-28

Characteristics and formation stages of natural fractures in Lower Silurian Longmaxi Formation in Tiangongtang area of Sichuan Basin

LI Linhao^{1, 2
,},
FAN Cunhui^{1, 2
, ,},
ZHAO Shengxian³,
LIU Shaojun³,
XU Fei^{1, 2},
NIE Shan^{1, 2},
YU Yawei^{1, 2}

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, SouthwestPetroleum University, Chengdu, Sichuan 610500, China
2.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3.
Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China

摘要

摘要: 四川盆地西南缘下志留统龙马溪组页岩气储量巨大，裂缝发育特征与形成期次对页岩气富集及产能具有重要影响。以天宫堂地区龙马溪组为研究对象，采用岩心分析、FMI成像测井、岩石声发射实验、裂缝充填物碳氧同位素测试、包裹体均一温度测试和埋藏—热演化史分析等分析技术和综合地质方法，研究页岩中天然裂缝的发育特征和形成时期。结果显示，研究区龙马溪组天然裂缝以构造成因的直立缝与低角度缝共同发育为特征，岩心裂缝具有发育程度高、延伸短、充填程度高等特征。成像测井裂缝倾角比对、岩心裂缝交切关系、裂缝充填物流体包裹体测试及岩石声发射实验等结果表明，天宫堂地区龙马溪组裂缝形成与3期构造运动有关。结合埋藏—热演化史分析可证实：第一期为NW向、NNE向平面剪切缝和NEE向剖面剪切缝，形成于燕山中期—晚期(130~62 Ma)，构造应力方位为近SN向(345°±5°)，包裹体均一温度为185~206 ℃；第二期为NE向、NWW向平面剪切缝和NNW向剖面剪切缝，形成于燕山晚期—喜马拉雅中期(62~34 Ma)，构造应力方位为EW向(80°±5°)，包裹体均一温度为165~184 ℃；第三期为近SN向、NEE向平面剪切缝和NE向剖面剪切缝，形成于喜马拉雅中期—现今(34 Ma至今), 构造应力方位为近NW向(315°±5°)，包裹体均一温度为125~162 ℃。结合地质力学背景，建立了天宫堂地区龙马溪组3期构造裂缝演化模式。
- 页岩裂缝 /
- 裂缝特征 /
- 构造期次 /
- 龙马溪组 /
- 下志留统 /
- 四川盆地
Abstract: The Lower Silurian Longmaxi Formation on the southwestern margin of the Sichuan Basin holds significant shale gas reserves. The characteristics and formation stages of fractures play a crucial role in shale gas accumulation and productivity. Focusing on the Longmaxi Formation in the Tiangongtang area, this study employed core analysis, FMI (Formation Micro-Imager) logging, rock acoustic emission experiments, carbon-oxygen isotope analysis of fracture fillings, fluid inclusion homogenization temperature testing, and burial-thermal evolution history analysis to investigate the development characteristics and formation periods of natural fractures in the shale. The results indicate that the natural fractures in the Longmaxi Formation in the study area are characterized by the coexistence of tectonic vertical and low-angle fractures. The core fractures exhibit high development density, short extension, and high filling degree. Comparison of imaging log fracture dip angles, core fracture cross-cutting relationships, fracture filling fluid inclusion tests, and rock acoustic emission experiments suggested that the fractures in the Longmaxi Formation in the Tiangongtang area were associated with three tectonic events. Combined with burial-thermal evolution history analysis, the formation periods were confirmed as follows: the first stage involved NW-oriented and NNE-oriented planar shear fractures, and NEE-oriented cross-sectional shear fractures formed during the mid-late Yanshanian period (130-62 Ma) with tectonic stress orientation near SN (345°±5°) and inclusion homogenization temperatures of 185-206 ℃; the second stage involved NE-oriented and NW-oriented planar shear fractures, and NNW-trending cross-sectional shear fractures formed during the late Yanshanian to mid-Himalayan period (62-34 Ma) with tectonic stress orientation near EW (80°±5°) and inclusion homogenization temperatures of 165-184 ℃; the third stage involved near SN-oriented and NEE-oriented planar shear fractures, and NE-oriented cross-sectional shear fractures formed from the mid-Himalayan period to present (34 Ma to present) with tectonic stress orientation near NW (315°±5°) and inclusion homogenization temperatures of 125-162 ℃. Based on the geomechanical background, a three-stage tectonic fracture evolution model for the Longmaxi Formation in the Tiangongtang area was established.
- shale fracture /
- fracture characteristic /
- tectonic stage /
- Longmaxi Formation /
- Lower Silurian /
- Sichuan Basin
注释:

1) 利益冲突声明/Conflict of Interests

1) 所有作者声明不存在利益冲突。

1) All authors disclose no relevant conflict of interests.

2) The study was designed and the manuscript was drafted and revised by LI Linhao and FAN Cunhui. ZHAO Shengxian, LIU Shaojun, XU Fei, NIE Shan and YU Yawei also participated in drafting and revising the manuscript. All authors have read the last version of the paper and consented to its submission.

2) 李林豪、范存辉参与论文设计、写作和修改，赵圣贤、刘绍军、徐飞、聂珊、余亚伟参与论文写作和修改。所有作者均阅读并同意最终稿件的提交。

2) 作者贡献/Authors’Contributions

HTML全文

图 1 川西南天宫堂地区构造样式(a)、过典型井剖面(b)及典型井下志留统龙马溪组柱状图(c)

Figure 1. Tectonic style of Tiangongtang area, southwestern Sichuan Basin (a), cross-section of typical well (b), and columnar map of typical well of Lower Silurian Longmaxi Formation (c)

下载: 全尺寸图片幻灯片

图 2 川西南天宫堂地区下志留统龙马溪组构造裂缝

a.Y208井，3 830.61~3 831.05 m，高角度剪切缝，方解石、石膏混合充填；b.Y207井，3 072.8 m，高角度剪切缝，方解石半充填；c.Y208井，3 830.1~3 830.3 m，高角度剪切缝，方解石全充填；d.Y203井，3 786.00~3 786.44 m，张性缝，方解石半充填；e.Y202井，3 501.99~3 502.20 m，异常高压缝，方解石、沥青混合充填；f.Y207井，3 031.43~3 031.70 m，页理缝；g.Y205井，3 433.89~3 433.98 m，页理缝；h.Y207井，3 069.09 m，构造缝；i.Y207井，3 049.62 m，构造缝。

Figure 2. Structural fractures of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

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图 3 川西南天宫堂地区裂缝FMI成像测井显示及走向玫瑰花图

Figure 3. Fracture FMI imaging logging display and strike rosette diagram in Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 川西南天宫堂地区下志留统龙马溪组岩心、薄片裂缝交切关系

Figure 4. Core and thin section fracture intersection relationship of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 川西南天宫堂地区下志留统龙马溪组页岩天然裂缝发育参数统计

Figure 5. Statistics of natural fracture development parameters for Lower Silurian Longmaxi Formation shale in Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

图 6 川西南天宫堂地区典型井裂缝纵向变化特征

Figure 6. Longitudinal variation characteristics of typical well fractures in Tiangongtang area, southwestern Sichuan Basin

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图 7 川西南天宫堂地区下志留统龙马溪组裂缝充填物包裹体均一温度

Figure 7. Homogenization temperature distribution of fractures filling inclusions of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

图 8 川西南天宫堂地区下志留统龙马溪组岩石声发射实验曲线

Figure 8. Experimental curves of rock acoustic emission of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

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图 9 川西南天宫堂地区裂缝充填物碳氧同位素交会分析

Figure 9. Cross plot analysis of carbon and oxygen isotope of fracture filling in Tiangongtang area, southwestern Sichuan Basin

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图 10 川西南天宫堂地区Y203井下志留统龙马溪组埋藏史

Figure 10. Burial history of Lower Silurian Longmaxi Formation in well Y203, Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

图 11 川西南天宫堂地区下志留统龙马溪组构造裂缝演化模式

Figure 11. Evolution model of structural fractures of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 川西南天宫堂地区下志留统龙马溪组裂缝充填物包裹体样品测温数据

Table 1. Temperature measurement data of inclusions of fracture filling materials of Lower Silurian Longmaxi Formation in Tiangongtang area, southwestern Sichuan Basin

井号	井深/m	宿主矿物	类型	均一温度/℃
Y202	3 503.25~3 503.53	石膏	原生	180~205
Y205	3 431.58~3 431.82	方解石	原生	125~130
Y208	3 830.17~3 830.37	方解石	原生	140~188
Y208	3 831.05	石膏	原生	145~162
Y209	4 453.00~4 453.25	方解石	原生	140~158
Y209	4 459.93~4 460.13	方解石	原生	148~172

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