摘要
准噶尔盆地腹部永进地区埋深侏罗系砂岩储层深度约为5850～6120m．由于塑性岩屑质量分数高，强烈的压实作用是破坏储层物性最主要的因素，但深部侏罗系砂岩内普遍发育的绿泥石黏土包膜是改善储层物性的重要因素.借助铸体、扫描电镜等手段分析表明，绿泥石包膜多为栉壳状垂直颗粒表面分布，为早期成岩阶段的产物；绿泥石包膜通过隔阻SiO2孔隙流体与石英颗粒的接触来抑制石英的次生加大，降低硅质胶结对孔隙的破坏；绿泥石包膜还可抑制压溶和颗粒溶蚀作用，减少易堵塞孔喉的自生矿物的形成，从而保存粒间孔隙，增加砂岩孔隙的连通性，有利于溶解作用的不断继续．
In Yongjin area located in the centre of Junggar Basin, sandstone reservoirs, buried deeply about 5 850～6 120 m, have high content plastic rock debris and strong diagenetic compaction has mostly destroyed reservoir pore spaces. However, grain-coating chlorite developing widely in deep burial reservoir has improved reservoir property. By dint of methods of slice and SEM, grain-coating chlorite mostly develops in distributary channel in meandering delta, which is pectinate vertically on grain surface and early diagenetic results. Moreover, grain-coating chlorite can prevent quartz from overgrowth through isolating pore fluid containing SiO2, and decrease porosity destructive resulting from siliceous cement. Moreover, through inhibition chemical compaction and corroded particle which can form authigenic mineral to blind pore, grain-coating chlorite can preserve intergranular pore, and therefore improve porosity connectivity favoring dissolution continuity.
出处
《大庆石油学院学报》
CAS
北大核心
2007年第2期24-27,124,共4页
Journal of Daqing Petroleum Institute
基金
国家教育部博士点基金项目(20060491505)
关键词
深埋侏罗系砂岩
绿泥石包膜
石英次生加大
流体通道
准噶尔盆地腹部
deeply buried Jurassic sandstones
grain-coating chlorite
quartz overgrowth
fluid pathway
the interior of Junggar Basin
