柴西南地区古—新近系砂岩储层成岩作用及其对储层物性的影响  

The diagenesis of Paleogene-Neogene sandstone reservoirs and its effects on the physical character of reservoirs in southwestern Qaidam Basin

作　　者：杜红权[1,2] 朱如凯[2] 何幼斌[1] 周川闽[2] 王君[2] 白斌[2] 刘伟[2] 

机构地区：[1]长江大学地球科学学院,湖北荆州434023 [2]提高石油采收率国家重点实验室(中国石油勘探开发研究院),北京100083

出　　处：《中国地质》2010年第1期152-158,共7页Geology in China

基　　金：国家科技重大专项(2008ZX05001)资助

摘　　要：依据普通薄片、铸体薄片、扫描电镜、X—衍射等分析,对柴西南地区古近—新近系砂岩储层的岩石学特征、成岩作用进行了研究,结果表明:该区储集砂体成分主要由长石岩屑砂岩、岩屑长石砂岩和岩屑砂岩组成,主要成岩作用类型有压实作用、胶结作用、溶蚀作用和交代作用,成岩演化阶段已达到中成岩B期;机械压实作用及胶结作用是早成岩阶段原生孔隙遭受破坏的主要成岩作用类型,溶蚀作用是中成岩阶段形成次生孔隙的主要成岩作用类型;受成岩作用及成岩演化阶段的控制,深部储层出现孔隙度、渗透率高异常发育带。Based on researches by means of ordinary thin sections,cast thin sections,scanning electron microscope and X-ray diffraction,the authors studied the petrologic and diagenetic characteristics of the Paleogene-Neogene sandstone reservoirs in southwestern Qaidam Basin,and the result shows that sandstone reservoirs in this area are mainly composed of feldspar lithic sandstone,lithic sandstone and lithic arkose and have mainly experienced such actions as compaction,cementation,corrosion and metasomatism,with the evolution reaching the middle diagenetic stage B.Compaction and cementation at the early diagenetic stage seem to have been the main diagenetic types which caused the destruction of primary pores,whereas corrosion at the middle diagenetic stage was probably the main diagenetic type resulting in the induced pores.Controlled by the diagenesis and the diagenetic phase,the induced pore development belt usually appears in relatively deep reservoirs,and the high abnormal belts of porosity and permeability are developed in deep reservoirs.

关 键 词：成岩作用 次生孔隙 柴达木盆地 

分 类 号：P618.13[天文地球—矿床学]