四川盆地下寒武统筇竹寺组（Є₁q）页岩过去常被认为是烃源岩。然而，近期资201井在德阳—安岳裂陷槽内筇竹寺组页岩中获得了7.388 × 10⁵ m³·d^-1的高产气流，标志着全球最古老、最高工业产能页岩气取得勘探突破。然而，德阳—安岳裂陷槽内的页岩气富集机制仍待厘清。本研究通过对比槽内外成藏要素，探讨了德阳—安岳裂陷槽内筇竹寺组页岩气的富集条件，得出若干认识。资201井获得高产的层段属于寒武系第三阶底部，恰好对应寒武纪生命大爆发主幕。早寒武世动物勃发，可通过捕食微型浮游生物，产生体积较大的有机质碎片和粪球，很可能加速了筇一段二亚段（Є₁q1₂）内的有机质沉降和富集；而高初级生产力和缺氧硫化环境促进了筇一段一亚段（Є₁q1₁）内的有机质富集。与槽外相比，德阳—安岳裂陷槽内的页岩储层厚度、脆性矿物含量、含气量和孔隙度等更优，尤其是有机孔在槽内更发育，有助于页岩气富集；而槽外页岩有机质热演化程度较高，部分有机孔可能因石墨化及压实作用而垮塌消失。另外，德阳—安岳裂陷槽内多见超压，表明页岩气保存较好，这得益于槽内页岩自封闭性强、远离大型断裂、微裂缝规模和期次有限。基于上述分析，本文提出了德阳—安岳裂陷槽内筇竹寺组页岩气的“三元富集”模式。鉴于1、2号储层与获得高产的3号储层参数相近且最优，建议重点针对这三套储层，建立“立体井网开发”模式。

The lower Cambrian Qiongzhusi (Є₁q) shale in the Sichuan Basin, formerly considered a source rock, recently achieved high gas production (7.388 × 10⁵ m³·d⁻¹) from well Z201 in the Deyang-Anyue rift trough (DART), marking an exploration breakthrough of the world’s oldest industrial shale gas reservoir. However, the shale gas enrichment mechanism within the DART is not fully understood. This study reviews the formation of the Qiongzhusi shale gas reservoirs within the DART by comparing them with cotemporaneous deposits outside the DART, and several findings are presented. The gas production interval was correlated with the main phase of the Cambrian explosion (lower Cambrian stage 3). In the early Cambrian ecosystem, dominant animals likely accelerated the settling rates of organic matter (OM) in the upper 1st member of Є₁q (Є₁q1₂) by feeding on small planktonic organisms and producing larger organic fragments and fecal pellets. High primary productivity and euxinic conditions contributed to OM enrichment in the lower 1st member of Є₁q (Є₁q1₁). Additionally, shale reservoirs inside the DART demonstrated better properties than those outside in terms of thickness, brittle minerals, gas content, and porosity. In particular, the abundant OM pores inside the DART facilitated shale gas enrichment, whereas the higher thermal maturity of the shales outside the DART possibly led to the graphitization and collapse of some OM pores. Meanwhile, the overpressure of high-production wells inside the DART generally reflects better shale gas preservation, benefiting from the shale’s self-sealing nature, “upper capping and lower plugging” configuration, and limited faults and microfractures. Considering these insights, we introduced a “ternary enrichment” model for the Qiongzhusi shale gas. Although the current high gas production of Z201 was found at the reservoir 3, two additional reservoirs were identified with significant potential, thus suggesting a “multilayer stereoscopic development” strategy in future shale gas exploration within the DART.