自生绿泥石对砂岩储集层影响的新认识  

New Sight about Affect of Authigenic Chlorite on Sandstone Reservoir

作　　者：公繁浩 鲍志东 范正平 伍星 刘丽 

机构地区：[1]中国石油大学地球科学学院油气资源与探测国家重点实验室,北京102249 [2]中国石油长庆油田分公司第五采油厂,西安710200

出　　处：《新疆石油地质》2011年第4期338-341,共4页Xinjiang Petroleum Geology

基　　金：国家973项目(2006CB202304);鄂尔多斯盆地大型岩性地层油气勘探开发示范工程(2008ZX05044)

摘　　要：通过对鄂尔多斯盆地西部姬塬地区三叠系延长组的岩石铸体薄片分析和扫描电镜的观察认为,早期自生绿泥石胶结对原生孔隙的转化、保存和改造起重要作用,主要表现为占据原生孔,并将其转化为黏土矿物晶间孔的形式,从空间上阻碍硅质胶结、碳酸盐胶结对孔隙的破坏,为后期流体改造储集层提供了通道;其亲油的黏土矿物属性,为后期油气在低孔、低渗储集层中成藏提供了条件。另外,因绿泥石化学性质较活泼,易发生水解,在开发具有绿泥石胶结的油藏时,应考虑到黏土矿物的敏感性。研究认为,绿泥石环边形成后储集层仍有较强的压实现象,前人认为的抗压能力可能被夸大。Early authigenic chlorite cementation is of significant effect on the conversion,preservation and reconstruction of primary pores,based on the casting thin section and SEM analyses of Triassic Yanchang formation of Jiyuan area in western Ordos basin.It mainly occupies primary pores,converting them into intercrystal pores of clay minerals which can impede the damages of siliceous and carbonate cements to the pores,providing pathways for late fluid reconstruction of reservoirs.Its oil-wet clay mineral attributes provide condition for late hydrocarbon accumulation in low porosity and low permeability reservoirs.Also,the sensitivity of clay minerals should be taken into consideration when developing chlorite cemented reservoirs due to chlorite＇s active and easy hydrolysis chemical properties.Though previous studies show an increase in compressive resistance in chlorite cemented reservoirs,this article demonstrates high compactions after the growth of grain-coating chlorite,which means such a compressive resistance may be overstated.

关 键 词：鄂尔多斯盆地 延长组 自生绿泥石 储集层 碳酸盐胶结 硅质胶结 

分 类 号：TE112.22[石油与天然气工程—油气勘探]