四川盆地德阳—安岳裂陷槽中段寒武系筇竹寺组页岩气差异富集过程——来自裂缝脉体与流体包裹体的证据

李彦佑; 吴娟; 周志鹏; 蒋前前; 石学文; 杨雨然; 罗超; 何一凡; 王恒; 梁静怡; 邓宾

doi:10.11781/sysydz2025050988

文章导航 > 石油实验地质 > 2025 > 47(5): 988-1002

李彦佑, 吴娟, 周志鹏, 蒋前前, 石学文, 杨雨然, 罗超, 何一凡, 王恒, 梁静怡, 邓宾. 四川盆地德阳—安岳裂陷槽中段寒武系筇竹寺组页岩气差异富集过程——来自裂缝脉体与流体包裹体的证据[J]. 石油实验地质, 2025, 47(5): 988-1002. doi: 10.11781/sysydz2025050988

引用本文:

LI Yanyou, WU Juan, ZHOU Zhipeng, JIANG Qianqian, SHI Xuewen, YANG Yuran, LUO Chao, HE Yifan, WANG Heng, LIANG Jingyi, DENG Bin. Differential enrichment process of shale gas in Cambrian Qiongzhusi Formation in middle section of Deyang-Anyue rift trough, Sichuan Basin: evidence from fracture veins and fluid inclusions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 988-1002. doi: 10.11781/sysydz2025050988

Citation:

LI Yanyou, WU Juan, ZHOU Zhipeng, JIANG Qianqian, SHI Xuewen, YANG Yuran, LUO Chao, HE Yifan, WANG Heng, LIANG Jingyi, DENG Bin. Differential enrichment process of shale gas in Cambrian Qiongzhusi Formation in middle section of Deyang-Anyue rift trough, Sichuan Basin: evidence from fracture veins and fluid inclusions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 988-1002. doi: 10.11781/sysydz2025050988

引用本文:

Citation:

LI Yanyou, WU Juan, ZHOU Zhipeng, JIANG Qianqian, SHI Xuewen, YANG Yuran, LUO Chao, HE Yifan, WANG Heng, LIANG Jingyi, DENG Bin. Differential enrichment process of shale gas in Cambrian Qiongzhusi Formation in middle section of Deyang-Anyue rift trough, Sichuan Basin: evidence from fracture veins and fluid inclusions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 988-1002. doi: 10.11781/sysydz2025050988

四川盆地德阳—安岳裂陷槽中段寒武系筇竹寺组页岩气差异富集过程——来自裂缝脉体与流体包裹体的证据

doi: 10.11781/sysydz2025050988

李彦佑^1,2,
吴娟^3,4, ,,
周志鹏³,
蒋前前³,
石学文^1,2,
杨雨然^1,2,
罗超^1,2,
何一凡^1,2,
王恒³,
梁静怡³,
邓宾^3,4

1. 中国石油西南油气田分公司页岩气研究院, 成都 610051;
2. 页岩气地质评价与高效开发四川省重点实验室, 成都 610051;
3. 成都理工大学能源学院(页岩气现代产业学院), 成都 610059;
4. 成都理工大学油气藏地质及开发工程全国重点实验室, 成都 610059

基金项目:

四川省自然科学基金面上项目(2025ZNSFSC0310),国家自然科学基金面上项目(42372174)和中国石油天然气股份有限公司科技项目(2023ZZ21YJ04)联合资助。

详细信息

作者简介:
李彦佑(1995—)，男，硕士，工程师，从事页岩气综合地质研究。E-mail：liyy_2021@petrochina.com.cn。

通讯作者:
吴娟(1985—)，女，博士，副教授，从事油气成藏过程与机理研究。E-mail: wujuan16@cdtu.edu.cn。

中图分类号: TE122.23
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出版历程
- 收稿日期: 2024-11-12
- 修回日期: 2025-08-03
- 刊出日期: 2025-09-28

Differential enrichment process of shale gas in Cambrian Qiongzhusi Formation in middle section of Deyang-Anyue rift trough, Sichuan Basin: evidence from fracture veins and fluid inclusions

LI Yanyou^1,2,
WU Juan^{3,4
, ,},
ZHOU Zhipeng³,
JIANG Qianqian³,
SHI Xuewen^1,2,
YANG Yuran^1,2,
LUO Chao^1,2,
HE Yifan^1,2,
WANG Heng³,
LIANG Jingyi³,
DENG Bin^3,4

1. Shale Gas Research Institute, Southwest Oil & Gasfield Company, PetroChina, Chengdu, Sichuan 610051, China;
2. Shale Gas Geological Evaluation and Efficient Development Key Laboratory of Sichuan Province, Chengdu, Sichuan 610051, China;
3. College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, Sichuan 610059, China;
4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

摘要

摘要: 四川盆地德阳—安岳裂陷槽寒武系筇竹寺组页岩气勘探近期取得了重要进展，已成为该盆地非常规油气勘探的重要接替区。聚焦裂陷槽中段筇竹寺组页岩，综合运用岩心观察、薄片鉴定、阴极发光、激光原位碳酸盐岩U-Pb同位素定年、流体包裹体岩相学与激光拉曼光谱分析、均一温度测试及盆地数值模拟等技术，系统研究了裂缝发育特征、矿物充填时序、包裹体类型—成分—温压参数，揭示了页岩气差异富集机制。研究区发育顺层缝、低—高角度张性缝及高角度剪性缝，其中，裂陷槽中心Z201井高角度剪性缝密集发育，槽缘西侧斜坡WY1H井裂缝发育程度较低，而威远构造高部位W201井发育高角度剪性缝并伴生热液充填矿物。裂缝以方解石充填为主，局部含石英、重晶石、白云石、黄铁矿等。脉体矿物中的烃类包裹体类型丰富，其捕获温度呈现甲烷包裹体>高饱和烃包裹体>沥青包裹体的特征，且甲烷包裹体捕获压力指示筇竹寺组曾普遍发育超压—强超压。结合埋藏—热演化史，研究区油气成藏演化历经了三个阶段：晚二叠世—早三叠世页岩油生成阶段、中侏罗世—早白垩世页岩气富集阶段、晚白垩世至今页岩气调整阶段。晚期构造调整差异显著：裂陷槽中心因调整微弱，强超压保存完整，是最优勘探靶区；槽缘西侧斜坡仍保持超压状态，含气性良好；而槽缘西侧高部位因喜马拉雅期强烈抬升剥蚀导致压力系数降至1.0，含气性显著下降，勘探需重点评价保存条件。
- 裂缝脉体 /
- 流体包裹体 /
- 页岩气 /
- 筇竹寺组 /
- 德阳—安岳裂陷槽 /
- 四川盆地
Abstract: In recent years, shale gas exploration in the Cambrian Qiongzhusi Formation within the Deyang-Anyue rift trough of the Sichuan Basin has achieved significant breakthroughs, establishing it as a crucial succession area for unconventional hydrocarbon exploration in the basin. Focusing on the Qiongzhusi Formation shale in the middle section of the rift trough, a series of analytical techniques were comprehensively employed, including core observations, thin-section analysis, cathodoluminescence (CL) imaging, laser in-situ U-Pb isotope dating of carbonate rock, fluid inclusion petrography, laser Raman spectroscopy, homogenization temperature testing, and basin numerical simulations. This study systematically investigated the fracture development characteristics, mineral-filling sequence, and the types, components, and thermobaric parameters of fluid inclusions, revealing the differential shale gas enrichment mechanisms in the study area. The results showed that bedding-parallel fractures, low- to high-angle tensile fractures, and high-angle shear fractures were developed. Specifically, well Z201 in the central rift trough exhibited densely developed high-angle shear fractures, while well WY1H on the western slope of the rift margin showed relatively weak fracture development. In contrast, well W201 in the high structural position of the Weiyuan area is characterized by high-angle shear fractures accompanied by hydrothermal mineral fillings. The fractures were predominantly filled with calcite, with local occurrence of quartz, barite, dolomite, and pyrite. Hydrocarbon inclusions in the vein minerals were diverse in type, with trapping temperatures decreasing in the order of methane > high-saturation hydrocarbon > bitumen. The trapping pressure for methane indicated that the Qiongzhusi Formation once widely experienced widespread overpressure to strong overpressure conditions. Combined with burial and thermal evolution histories, the results suggested that hydrocarbon accumulation in the study area experienced three stages: a shale oil generation stage from the Late Permian to Early Triassic, a shale gas enrichment stage from the Middle Jurassic to Early Cretaceous, and a shale gas adjustment stage from the Late Cretaceous to the present. Late-stage tectonic adjustments showed clear spatial differences. The central rift trough experienced minimal adjustments, preserving intact strong overpressure and thus serving as the optimal exploration target. The western slope of the rift trough margin remained overpressured with good gas-bearing properties. In contrast, the high structural position on the western rift trough margin experienced intense uplift and denudation during the Himalayan period, which reduced the pressure coefficient to 1.0 and significantly decreasing its gas-bearing capacities. Therefore, careful evaluation of preservation conditions is critical for exploration.
- fracture vein /
- fluid inclusion /
- shale gas /
- Qiongzhusi Formation /
- Deyang-Anyue rift trough /
- Sichuan Basin

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