CAJ | 학술논문

通过岩石薄片、铸体薄片、扫描电镜及压汞等分析测试手段对储层特征进行了详细研究，发现柴北缘冷湖五号上干柴沟组储层主要为三角洲相细砂岩和粉砂岩，少部分中砂岩和粗砂岩。岩石主要经历了压实、胶结及溶蚀等成岩作用，具有压实、溶蚀作用中等和胶结作用较强的特点，胶结物主要有碳酸盐胶结、硫酸盐胶结、硅质胶结和自生黏土矿物胶结。储层现处于晚成岩阶段A期。研究区的孔隙类型主要是残余粒间孔和溶蚀扩大孔。储层物性受控于沉积相带和成岩作用，优质储层为三角洲分流河道砂、水下分流河道砂和席状砂，成岩作用对储层的影响主要体现在溶蚀作用对孔隙的扩大和压实、胶结作用对孔隙的破坏。
통과암석박편、주체박편、소묘전경급압홍등분석측시수단대저층특정진행료상세연구，발현시북연랭호오호상간시구조저층주요위삼각주상세사암화분사암，소부분중사암화조사암。암석주요경력료압실、효결급용식등성암작용，구유압실、용식작용중등화효결작용교강적특점，효결물주요유탄산염효결、류산염효결、규질효결화자생점토광물효결。저층현처우만성암계단A기。연구구적공극류형주요시잔여립간공화용식확대공。저층물성수공우침적상대화성암작용，우질저층위삼각주분류하도사、수하분류하도사화석상사，성암작용대저층적영향주요체현재용식작용대공극적확대화압실、효결작용대공극적파배。
Based on core observation,cast thin section,scanning electron microscopy and Hg-injection analysis and so on,we studied reservoir characteristics of structural reservoir in No.5 Unit of Lenghu Area in Qaidam Basin. The results show that the structural reservoir in No.5 Unit of Lenghu Area are mainly fine-grained sandstone and siltite,a small part of medium sandstone and coarse-grained sandstone of delta facies. The rocks were mainly experienced compaction,cementation and dissolution, and the diagenesis characteristics of the study area are medium compaction and dissolution,stronger cementation,the main cements are carbonate,sulfate,siliceous and clay mineral cement. Reservoirs are in A stage of late diagenesis. Pore types of the study area are residual intergranular pores and dissolution expand holes. Reservoir properties are both controlled by sedimentary facies and diagenesis,high quality reservoir is delta distributary channel sand,subaqueous distributary channel sand and sheet sand;Diagenesis also influences the reservoir properties in which compaction and cementation decrease the porosity,dissolution increases secondary porosity.