The diagenesis and diagenetic facies of shale reservoirs in Lucaogou Formation of Jimusar Sag were studied by means of microscopic observation and identification of ordinary thin sections and cast thin sections, X-ray diffraction, scanning electron microscope and electron probe tests. The results show that alkaline and acidic diagenetic processes occurred alternately during the deposition of Permian Lucaogou Formation in Jimusar Sag. The evolution of porosity in the shale reservoirs was influenced by compaction and alternate alkaline and acidic diagenetic processes jointly, and has gone through three stages, namely, stage of porosity reduction and increase caused by alkaline compaction, stage of porosity increase caused by acid dissolution, and stage of porosity increase and reduction caused by alkaline dissolution. Correspondingly, three secondary pore zones developed in Lucaogou Formation. The shale reservoirs are divided into three diagenetic facies: tuff residual intergranular pore-dissolution pore facies, tuff organic micrite dolomite mixed pore facies, and micrite alga-dolomite intercrystalline pore facies. With wide distribution, good pore structure and high oil content, the first two facies are diagenetic facies of favorable reservoirs in Lucaogou Formation. The research results provide a basis for better understanding and exploration and development of the Lucaogou Formation shale reservoirs.

通过显微观察，普通薄片和铸件薄片的鉴定，X射线衍射，扫描电镜和电子探针试验等手段，对吉木萨尔凹陷芦草沟组页岩储层的成岩作用和成岩相进行了研究。结果表明，吉木萨尔凹陷二叠系芦草沟组沉积过程中，碱性和酸性成岩过程交替发生。页岩储集层孔隙演化受压实作用和碱性，酸性成岩作用交替影响，经历了孔隙减少和碱压实增加，酸溶引起孔隙度增加，碱溶蚀导致孔隙度增加和减少的阶段。相应地，芦草沟组发育三个次生孔隙带。页岩储集层划分为三个成岩相：凝灰岩残余粒间孔溶质孔隙相，凝灰岩有机云母白云石混合孔相和云母藻-白云岩晶间孔相。前两个相是芦草沟组有利储层的成岩相，分布广，孔隙结构好，含油量高。研究结果为更好地了解和开发芦草沟组页岩储层提供了基础。前两个相是芦草沟组有利储层的成岩相，分布广，孔隙结构好，含油量高。研究结果为更好地了解和开发芦草沟组页岩储层提供了基础。前两个相是芦草沟组有利储层的成岩相，分布广，孔隙结构好，含油量高。研究结果为更好地了解和开发芦草沟组页岩储层提供了基础。