四川盆地泸州地区五峰组–龙马溪组超压成因及演化过程
Genesis and Evolutionary Process of Overpressure in the Wufeng-Longmaxi Formations, Luzhou Area, Sichuan Basin
摘要: 四川盆地泸州地区作为川南页岩气勘探开发主力区块，五峰组–龙马溪组页岩气藏普遍发育强超压，且超压特征与页岩气高产密切相关。前人研究多聚焦于超压主控因素定性分析，但对该区多因素复合增压机制及定量贡献缺乏系统研究。文章通过多方法结合，揭示泸州地区超压成因机制及演化规律，为页岩气成藏与保存评价提供科学依据。通过测井曲线组合、Bowers图版识别泸州地区为复合型成因超压；对裂缝脉体开展薄片观察、阴极发光、显微测温及激光拉曼光谱测试，恢复甲烷包裹体捕获压力为82.76~108.99 MPa；结合所收集的三轴主应力数据，利用构造挤压增压模型，计算构造挤压增压贡献量为4.3~11.5 MPa；基于钻井基本数据及有机质成熟度等关键边界参数，利用盆地数值模拟方法，恢复泸州地区五峰组–龙马溪组埋藏–热演化史与压力演化历史，综合分析认为泸州地区为“早期有限聚集–中晚期持续富集–晚期构造保存型”超压演化模式。
Abstract: The Luzhou area in the Sichuan Basin, as a key block for shale gas exploration and development in southern Sichuan, exhibits widespread strong overpressure in the Wufeng-Longmaxi shale gas reservoirs, with overpressure characteristics closely linked to high gas production. Previous studies primarily focused on qualitative analysis of overpressure controls, but systematic research on the multi-factor composite overpressure mechanisms and their quantitative contributions remains lacking. This study integrates multiple methods to unravel the genetic mechanisms and evolutionary patterns of overpressure in the Luzhou area, providing scientific insights for shale gas accumulation and preservation assessment. By combining well-log curves and Bowers plots, the overpressure in the Luzhou area was identified as having a composite origin. Thin-section observations, cathodoluminescence, microthermometry, and laser Raman spectroscopy of fracture veins revealed methane inclusion entrapment pressures of 82.76~108.99 MPa. Combined with triaxial principal stress data, tectonic compression overpressure contributions of 4.3~11.5 MPa were calculated using a tectonic compression overpressure model. Basin numerical modeling, constrained by drilling data and key boundary parameters (e.g., organic matter maturity), reconstructed the burial-thermal evolution history and pressure evolution history of the Wufeng-Longmaxi Formation. Comprehensive analysis suggests an overpressure evolution model characterized by “limited early accumulation, sustained mid-late enrichment, and late-stage tectonic preservation” in the Luzhou area.
文章引用：周志鹏, 蒋前前, 梁静怡, 匡龙伟, 谢金旭, 陈卓越. 四川盆地泸州地区五峰组–龙马溪组超压成因及演化过程[J]. 地球科学前沿, 2025, 15(5): 614-625. https://doi.org/10.12677/ag.2025.155060

参考文献

[1] 周文, 徐浩, 余谦, 等. 四川盆地及其周缘五峰组-龙马溪组与筇竹寺组页岩含气性差异及成因[J]. 岩性油气藏, 2016, 28(5): 18-25.
[2] 姜鹏飞, 吴建发, 朱逸青, 等. 四川盆地海相页岩气富集条件及勘探开发有利区[J]. 石油学报, 2023, 44(1): 91-109.
[3] 赵靖舟, 李军, 徐泽阳. 沉积盆地超压成因研究进展[J]. 石油学报, 2017, 38(9): 973-998.
[4] 李跃纲, 周安富, 谢伟, 等. 四川盆地南部泸州地区五峰组-龙一1亚段页岩岩相划分及储层发育主控因素[J]. 天然气工业, 2022, 42(8): 112-123.
[5] 邱晨, 闫建平, 钟光海, 等. 四川盆地泸州地区奥陶系五峰组-志留系龙马溪组页岩沉积微相划分及测井识别[J]. 岩性油气藏, 2022, 34(3): 117-130.
[6] 唐令, 宋岩, 赵志刚, 等. 四川盆地上奥陶统五峰组-下志留统龙马溪组页岩气藏超压成因及演化规律[J]. 天然气工业, 2022, 42(10): 37-53.
[7] 罗超, 李金玺, 李智武, 等. 四川盆地泸州区块构造变形特征及形成过程[J]. 成都理工大学学报(自然科学版), 2022, 49(6): 665-673.
[8] 杨雪, 石学文, 朱逸青, 等. 四川盆地南部泸州地区凯迪阶-埃隆阶深水页岩沉积演化与有机质富集[J]. 石油学报, 2022, 43(4): 469-482.
[9] Fertl, W.H. (1976) Abnormal Formation Pressures: Implications to Exploration, Drilling, and Production of Oil and Gas Resources. Elsevier Science Publisher Co.
[10] Bowers, G.L. (1995) Pore Pressure Estimation from Velocity Data: Accounting for Overpressure Mechanisms Besides Undercompaction. SPE Drilling & Completion, 10, 89-95. [Google Scholar] [CrossRef] 
[11] Tingay, M.R.P., Hillis, R.R., Swarbrick, R.E., Morley, C.K. and Damit, A.R. (2009) Origin of Overpressure and Pore-Pressure Prediction in the Baram Province, Brunei. AAPG Bulletin, 93, 51-74. [Google Scholar] [CrossRef] 
[12] 邹晓艳, 李贤庆, 王元, 等. 川南地区五峰组-龙马溪组深层页岩储层特征和含气性[J]. 天然气地球科学, 2022, 33(4): 654-665.
[13] 高键, 何生, 易积正. 焦石坝页岩气田中高密度甲烷包裹体的发现及其意义[J]. 石油与天然气地质, 2015, 36(3): 472-480.
[14] Lu, W., Chou, I., Burruss, R.C. and Song, Y. (2007) A Unified Equation for Calculating Methane Vapor Pressures in the CH4-H2O System with Measured Raman Shifts. Geochimica et Cosmochimica Acta, 71, 3969-3978. [Google Scholar] [CrossRef] 
[15] Duan, Z., Møller, N. and Weare, J.H. (1992) An Equation of State for the CH4-CO2-H2O System: I. Pure Systems from 0 to 1000˚C and 0 to 8000 Bar. Geochimica et Cosmochimica Acta, 56, 2605-2617. [Google Scholar] [CrossRef] 
[16] 张凤奇, 王震亮, 钟红利, 等. 沉积盆地主要超压成因机制识别模式及贡献[J]. 天然气地球科学, 2013, 24(6): 1151-1158.
[17] 郭旭升, 胡东风, 俞凌杰, 等. 页岩自封闭性与页岩气保存的微观机理研究[J]. 石油实验地质, 2023, 45(5): 821-831.
[18] 姜振学, 梁志凯, 申颍浩, 等川南泸州地区页岩气甜点地质工程一体化关键要素耦合关系及攻关方向[J]. 地球科学, 2023, 48(1): 110-129.