摘要
根据岩心观察、薄片鉴定、压汞实验及扫描电镜资料,分析海拉尔盆地苏德尔特地区南屯组一段凝灰质砂岩储层微观非均质性及其主控因素.结果表明:由于火山碎屑物介入,与正常砂岩相比,该地区储层凝灰质砂岩孔隙类型多样,结构更加复杂,微观非均质性更强;凝灰质砂岩沉积微相类型及凝灰质来源成因是形成储层微观非均质性的基本因素,决定岩石的成分与组构和后期成岩作用的类型和强度;凝灰质砂岩成分中,火山碎屑颗粒晶屑、玻屑及岩屑的相对比例,火山碎屑颗粒与火山灰基质的相对比例不同,砂岩孔隙结构和物性也存在较大的差异性.成岩作用是增强储层非均质性的关键,压实和胶结作用对形成低孔、低渗储层起到决定性作用;凝灰质成分与含量的差异,增加各成岩作用在空间的差异性,增强微观非均质性.研究结果对该类型储层的预测与油气藏开发具有指导意义.
Tuffaceous sandstone belongs to abnormal pattern reservoir that has low porosity and permeability,and has large distribution area in many sedimentary basins.This paper aims at describing the reservoir microcosmic heterogeneity characteristics and analyzing its major control factors,which is very important to this type reservoir's predication and development.Based on the comprehensive research of the cores,thin slices,SEM,mercury-injection data,and predecessors' research outcome of Suderte area in Hailar basin,we come to the conclusion that,compared with normal sandstone,tuffaceous sandstone has more pore types and more complicated pore texture because of pyroclastics composition mixing,and has severely micro-cosmic heterogeneity correspondingly.Sedimentary mircofacies types and tuffaceous origin of sandstone are the fundamental factors effected reservoir micro-cosmic heterogeneity because they decided the lithologic composition,diagenesis type and degree.With different relative content among crystal,shard and lithic in pyroclastic grain,or different relative content between pyroclastic grain and ash matrix,sandstone has different pore texture and physical property characteristics.Diagenesis plays a key part in aggravating reservoir heterogeneity.Compaction and cementation caused sandstone 'low porosity and permeability' property.But tuff composition and content difference in sandstone increased diagenesis disparity in 3D dimension space,aggravating reservoir microcosmic heterogeneity correspondingly.
出处
《大庆石油学院学报》
CAS
北大核心
2011年第4期30-37,7,共8页
Journal of Daqing Petroleum Institute
基金
教育部油气地质创新团队项目(IRT0864)
关键词
凝灰质砂岩
海拉尔盆地
孔隙结构
微观非均质性
沉积微相
砂岩成分
成岩作用
tuffaceous sandstone
Hailar basin
pore texture
microcosmic heterogeneity
sedimentary microfacies
sandstone composition
diagenesis
作者简介
王宏语（1973-），男，博士，副教授，主要从事沉积储层等方面研究
