直罗油田姜家川区长8储层微观特征研究

Chang 8 Reservoir Microscopic Charactereristcs of Zhiluo Oilfield in Jiangjiachuan District

通过岩芯及薄片的观察,结合扫描电镜和X衍射等资料分析,对直罗油田长8储层成岩作用及其对储层物性的影响做了研究。结果表明姜家川区长8储层砂岩类型以粉砂—细砂级长石砂岩为主,碎屑颗粒以次圆—次棱角状为主,颗粒分选性较好,胶结类型以孔隙胶结为主。研究区主要经历的成岩作用类型有压实作用、胶结作用、溶蚀作用等。压实作用、胶结作用使储集空间变小,对储层的破坏性较大,而溶蚀作用使储层物性得到一定的改善。

The paper makes a research on the diagenesis happened in Chang 8reservoir of Zhiluo Oilfield and its effect on reservoir physical properties by analyzing experimental data of scanning electron microscope,X-ray diffraction on rock core and slice.The result shows that most sandstones in this reservoir is silt-fine grain arkose featuring subrounded and subangular particles of good separation and pore cementation.The diagenesis in Chang 8reservoir mainly includes compaction,cementaion and dissolution.Compaction and cementation make reservoir space smaller and damage reservoirs while dissolution improves reservoir physical properties.