孔隙衬里绿泥石的成因及对储层性能的影响  

The Pore-Lining Chlorite Formation Mechanism and Its Contribution to Reservoir Quality

作　　者：田建锋[1] 喻建 张庆洲 

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]中国石油长庆油田分公司油藏评价处,西安710021 [3]中国石油长庆油田超低渗透油藏研究中心,西安710018

出　　处：《吉林大学学报（地球科学版）》2014年第3期741-748,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41202105)

摘　　要：孔隙衬里绿泥石发育的砂岩大多属于优质储层,前人将其归功于绿泥石对孔隙的保护作用。按照孔隙衬里绿泥石形成的铁质来源,可划分为同沉积黏土膜转化型、富铁镁物质溶蚀再结晶型和转化与直接结晶混合型3种类型。通过国内外富孔隙衬里绿泥石砂岩实例的对比研究表明,孔隙衬里绿泥石可以通过抑制自生石英生长、提高抗压实能力、指示早期碱性溶蚀发育程度和堵塞孔喉等4种方式影响储层性能,且不同成因的孔隙衬里绿泥石对储层性能影响方式不同,同一成因绿泥石在不同成岩阶段的影响方式也不同。中成岩A期以前,转化型孔隙衬里绿泥石通过占据孔喉和提高抗压能力影响储层,而溶蚀结晶型孔隙衬里绿泥石主要指示火山物质发生碱性溶蚀的程度;只有砂岩成岩阶段达到中成岩B期以后,孔隙衬里绿泥石对石英生长的抑制作用才得到充分体现。The sandstone reservoirs containing pore-lining chlorite are commonly high-quality reservoir which is believed to be due to the pore-lining chlorite by weakening authigenic quartz cement growth on detrital grains.Based on the source of iron,the formation mechanism of pore-lining chlorite consists of transformation of precursor clay minerals, direct precipitation from iron-rich substance dissolution,and mixture of precursor clay and direct precipitation.Comparative study of domestic and foreign sandstone reservoirs with abundant pore-lining chlorite shows that the pore-lining chlorite can influence reservoir quality by retarding authigenic quartz cement growth,enhancing sandstone resistance ability to compaction,indicating the degree of early alkaline dissolution and blocking pore throat.The influence way and degree on reservoir are determined by chlorite genesis and diagenetic stage.Before＆amp;nbsp;period A of middle diagenetic stage,the transformed chlorite affects sandstone reservoir quality by suppressing quartz overgrowth and raising sandstone resistance ability to compaction,and the direct precipitation chlorite affects by indicating the degree of early alkaline dissolution.After accessing to period B of middle diagenetic stage, the pore-lining chlorite show full ability to weaken quartz cementation in sandstone reservoirs.

关 键 词：绿泥石 储层 溶蚀作用 砂岩 成岩作用 

分 类 号：P618.13[天文地球—矿床学]