鄂尔多斯盆地子洲油田长4＋5、长6储层成岩作用研究

子洲油田长4＋5、长6油层组属于低孔、低渗储层。碎屑组分及其含量以及胶结物组分及其含量是影响储层物性的主要因素。本区长4＋5、长6砂岩已达晚成岩A期,经历了早成岩阶段早期的机械压实和黏土膜析出、早成岩阶段晚期的石英、长石压溶及次生加大、晚成岩阶段早期的自生矿物析出和随后发生的长石、岩屑、云母及方解石等的溶蚀,形成次生孔隙等成岩作用过程。

Diagenesis Research of Chang 4+5 and Chang6 Reservoir in Zizhou oilfield,Ordos Basin

Chang 4＋5 and chang6 oil-bearing formation is the low porosity and low permeability reservoir in Zizhou oilfield. Content of detrital composition and Content of cement are major factors which influence on Reservoir Physical Property. Chang 4＋5 and chang6 sandstone has reached＂ A＂ period of late diagenesis phase which underwent compaction and clay membrane separating out in early period of early diagenesis phase, pressure solution of quartz and feldspar and secondary adding in late period of early diagenesis phase, authigene cementation and dissolution which results in the forming of secondary pore in early period of late diagenesis phase.