川西坳陷须家河组砂岩中碳酸盐胶结物及形成机制  

Carbonate Cements from Xujiahe Sandstone and Its Forming Mechanism,West Sichuan Depression

作　　者：刘昊年[1] 邓丽丽[2] 龚业超[1] 孙伟[1] 

机构地区：[1]成都理工大学沉积地质研究院 [2]成都市国土资源信息中心

出　　处：《天然气技术》2008年第5期24-27,78,共4页NATURAL GAS TECHNOLOGY

摘　　要：碳酸盐胶结物是川西坳陷须家河组储层砂岩中最重要的自生矿物,主要类型包括方解石、白云石、铁方解石和铁白云石等。研究结果表明,须四段砂岩中的方解石胶结物可能是在相对浅埋藏阶段沉淀的,物质来源与长石等硅铝酸盐的溶解有关。须二段白云石胶结物是在相对深埋藏的条件下沉淀的,它可能还与海相地层镁的迁移有关。早期的分散胶结作用对砂岩储层具有一定积极意义,但大多数碳酸盐胶结作用对储层的影响都是负面的。Carbonate cements are the most important autogenic mineral in sandstone reservoir of Xujiahe Formation,West Sichuan Depression.And the cements include calcite,dolomite,ferrocalcite and ankeite.Astudy of carbonate cements indicates that calcite cement from Xujiahe 4 sandstone might be precipitated during a relatively shallower burial stage and its source was related to the solution of aluminosilicate such as feldspar;dolomite cement from Xujiahe 2 sandstone was precipitated during a relatively deeper burial stage and it might be related to the magnesium migration in marine stratum.An effect of most carbonate cementation on reservoir is unfavorable even though an early dispersed cementation is significant for sandstone reservoir.

关 键 词：川西坳陷 须家河组 碳酸盐胶结物 储层 

分 类 号：P618.13[天文地球—矿床学]