Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment. However, currently there are just a few studies on this subject matter. Therefore, the characteristics of pyrite in organic-rich shale section of the Longmaxi Formation and its impact on shale gas enrichment was studied in this paper by using outcrops, drilling cores, thin sections and test data. Result shows that pyrite occurred in different forms (macro-micro scale) in the Longmaxi Formation in the southeast Sichuan Basin. The formation and content of pyrite has a close relation with TOC content. Pyrite may catalyze the hydrocarbon generation of organic matter. Interparticle pores within the pyrite framboids and organic matter pores in the pyrite-organic matter complex are well-developed in the Longmaxi Shale, which serves as a major reservoir space for shale gas. Pyrite can promote shale gas enrichment by absorbing shale gas on its surface and preserving free gas in the interparticle pores and organic matter pores. In addition, as a kind of brittle mineral, pyrite can improve the brittleness of shale reservoir and increase the micro-nano pore system in shale reservoir, thereby improving the transmission performance of shale reservoir and boosting shale gas recovery.

黄铁矿是页岩的重要成分之一，在页岩气富集中起着至关重要的作用。然而，目前关于这个主题的研究很少。为此，本文利用露头、钻芯、薄片和试验资料，研究了龙马溪组富有机质页岩段黄铁矿的特征及其对页岩气富集的影响。结果表明，川东南龙马溪组黄铁矿以不同形态（宏观—微观）赋存。黄铁矿的形成和含量与TOC含量密切相关。黄铁矿可催化有机物的烃生成。龙马溪页岩黄铁矿小柱状体粒间孔和黄铁矿-有机质复合体有机质孔发育，是页岩气的主要储集空间。黄铁矿通过在其表面吸收页岩气并在粒间孔和有机质孔中保留游离气来促进页岩气富集。此外，黄铁矿作为一种脆性矿物，可以提高页岩储层的脆性，增加页岩储层中的微纳米孔隙系统，从而提高页岩储层的传输性能，促进页岩气采收率。