Abstract: As a large-scale Permian shale gas field in China, Hongxing shale gas field in Sichuan Basin has proven geological reserves of 1 650.25×10⁸m³, breaking the conventional exploration paradigm only in Silurian. Based on core analysis, well logging, and experimental data, the accumulation conditions of shale gas in Permian Wujiaping Formation are systematically investigated. The Wujiaping Formation shale gas reservoir exhibits "four highs and one thin" characteristics (high total organic carbon content, high porosity, high gas content, high carbonate content, and thin reservoir thickness), as well as complex structural conditions. Among these, organic-rich shale provides the material basis for hydrocarbon accumulation, while relatively stable structural preservation conditions ensure effective shale gas enrichment. Referring to exploration and development practices, the paper elaborates the geology-engineering integration framework, based on which Jianghan oilfield has conducted a series of key technological research initiatives, targeting exploration breakthroughs and economic development of thin-bedded shale gas, thus establishing innovative theories and key technological systems such as high-conductivity fracturing. The results show that the "four highs and one thin" model of Wujiaping Formation constitutes the material basis for shale gas accumulation, while structurally stability zones and hydrostatic pre ssure regimes effectively ensure shale gas preservation. Through technological innovation, the single-well production has increased from 8.90×10⁴m³/d to 32.35×10⁴m³/d, providing a critical reference for the exploration and development of deep and thin-bedded shale gas.

Key words: Sichuan Basin, Hongxing shale gas field, Permian, hydrocarbon accumulation conditions, fracturing stimulation

摘要： 四川 盆地红星页岩气田作为中国二叠系大型页岩气田,其探明储量达1 650.25×10⁸m³,突破了仅在志留系单一层系勘探开发页岩气的格局。基于岩心分析、测录井和实验测试数据,系统研究了该气田二叠系吴家坪组页岩的成藏条件。吴家坪组页岩气藏具有"四高一薄"(高有机碳含量、高孔隙度、高含气量、高碳酸盐含量、页岩厚度薄)及构造条件复杂的地质特征,其中,富碳页岩奠定了成藏的物质基础,相对稳定的构造保存条件为页岩气的富集提供了有效保障。结合勘探开发实践,系统阐述了江汉油田立足地质—工程一体化理念,围绕薄层页岩气勘探突破与效益开发所开展的一系列关键技术攻关成果,形成了创新理论与高导流压裂等关键技术体系。研究结果表明:吴家坪组的"四高一薄"特征构成了页岩气成藏的物质基础,构造稳定区与常压环境有效保障了页岩气的保存条件。通过技术创新,单井产量由初期的8.90×10⁴m³/d 提升至32.35×10⁴m³/d,为深层薄层页岩气勘探开发提供了重要示 范。

关键词: 四川盆地, 红星页岩气田, 二叠系, 成藏条件, 压裂改造