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深层页岩纹层发育特征研究——以四川盆地大足地区龙马溪组为例

Research on the Development Characteristics of Deep Shale Laminae —Taking the Longmaxi Formation in the Dazu Area of the Sichuan Basin as an Example

Environment and Resource / 2026,8(1): 73-80 / 2026-02-27 15 6

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• Authors: 杨智文 王占磊
• Information:

  西南石油大学地球科学与技术学院，成都

• Keywords:
  Dazu region; Longmaxi formation; Deep shale; Lamination
  大足地区; 龙马溪组; 深层页岩; 纹层
• Abstract: The deep shale gas resources are vast in scale and possess significant development potential. The study of lamination structure is crucial for evaluating the effectiveness of shale reservoirs. However, the understanding of the lamination development characteristics of deep shale in the Dazu area of the Sichuan Basin remains unclear, hindering further exploration and development. This study integrates core observation, thin section identification, and quantitative statistical methods to systematically investigate the lamination types, combination patterns, and spatial distribution laws of the Longmaxi Formation’s Longyi 1 sub-member shale in the study area. The results indicate that the laminations in the study area can be divided into two types: mud laminations (organic matter/clay) and silt laminations (siliceous/ calcareous). These can be further categorized into six lamination combination types: clay-siliceous (sparse) lamination group, calcareous-organic matter-rich (alternating) lamination group, calcareous-organic matter-rich (dense) lamination group, siliceous-organic matter-rich (sparse) lamination group, siliceous-organic matter-rich (alternating) lamination group, and siliceous-organic matter-rich (dense) lamination group. Vertically, the lamination density increases from bottom to top, with a transition from siliceous laminations to calcareous/clay laminations. Horizontally, the lamination density significantly decreases from the northwest to the southeast (from the Mituochang syncline to the Puluchang syncline), with a reduction in the proportion of calcareous laminations and a shift in lamination combination from dense to sparse. 深层页岩气资源规模巨大，具有广阔的开发潜力。纹层结构研究对页岩系统储层有效性评价具有重要意义，但四川盆地大足地区深层页岩纹层发育特征的认识尚不明确，影响了勘探开发的进一步推进。本研究综合岩心观察、薄片鉴定与定量统计方法，对研究区龙马溪组龙一1亚段页岩开展了纹层类型、组合样式及空间展布规律的系统研究。结果表明：研究区纹层可划分为泥纹层（有机质/黏土）与粉砂纹层（硅质/钙质）两类，并可进一步归纳为黏土-硅质（稀疏式）纹层组、钙质-富有机质（相间式）纹层组、钙质-富有机质（紧密式）纹层组、硅质-富有机质（稀疏式）纹层组、硅质-富有机质（相间式）纹层组、硅质-富有机质（紧密式）纹层组6种纹层组合类型；纵向上，自下而上纹层密度增大、硅质纹层向钙质/黏土质纹层过渡；平面上，自北西向南东方向（弥陀场向斜至蒲吕场向斜）纹层密度显著降低，钙质纹层占比减少，纹层组合由紧密式向稀疏式转变。
• DOI: https://doi.org/10.35534/er.0801009 (registering DOI)
• Cite: 杨智文，王占磊．深层页岩纹层发育特征研究——以四川盆地大足地区龙马溪组为例［J］．环境与资源，2026，8（1）：73-80.