特低渗储层不同孔隙组合类型的微观孔隙结构及渗流特征——以甘谷驿油田唐157井区长6储层为例  

Microscopic pore structure and seepage characteristics of different pore assemblage types in ultra low permeability reservoir:a case of Chang 6 reservoir in Tang 157 well area,Ganguyi Oilfield

作　　者：赵习森 党海龙 庞振宇 时丕同 曹尚 丁磊 白璞 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,西安710075

出　　处：《岩性油气藏》2017年第6期8-14,共7页Lithologic Reservoirs

基　　金：陕西省科技统筹创新工程计划项目"陕北致密砂岩油藏CO2驱提高采收率关键技术研究及先导试验"(编号:2014KTZB03-02);国家科技支撑计划课题"CO2埋存与提高采收率技术"(编号:2012BAC26B03)联合资助

摘　　要：为了有效克服特低渗储层非均质性对注水开发效果的影响,首次从孔隙组合类型的角度出发,与高压压汞、恒速压汞、核磁共振和真实砂岩水驱油等实验相结合,从宏观和微观两方面对注水开发储层特征进行精细定量表征:标定了不同孔隙组合类型的主流喉道半径和可动流体饱和度的大小,明确了不同孔隙组合类型的驱替类型及残余油的赋存状态。结果表明:溶孔-粒间孔、粒间孔型储层具有物性好,压实率、胶结率均较低和含油饱和度较高的特征,多发育(水下)分流河道中。其可动流体饱和度最高,易形成优势通道。优势通道的主流喉道半径为0.963~1.494μm,驱替类型以指状驱替为主,为主要剩余油富集区;粒间孔-溶孔型和溶孔-微孔、微孔型储层特征依次变差,主流喉道半径分别为0.432~1.071μm和0.364~0.411μm,驱替类型,逐渐过渡到指状-网状、网状驱替,直至驱不动。Aiming to overcome reservoir heterogeneity influence in water injection development,it is the first that high mercury injection,constant mercury injection,nuclear magnetic resonance have been applied to make an accurate quantification of reservoir characteristics in the stage of water injection from the angle of pore combination. In this paper main current throat radius and moveable fluid saturation have been defined for the sake of understanding the features of water flooding and residual oil for different pore assembly types. Dissolved/intergranular pores developing in the favorable sedimentary faces of the lowest compaction and cementation make its reservoir have the highest value of porosity,permeability,oil saturation and moveable fluid saturation,which makes the apparent apartment of oil and is the easiest to form preponderant permeable paths of 0.963-1.494 μm main current throat radius and fingering flooding results in residual oil of large area. Secondly by the sequence of intergranular-dissolved,dissolved-micro and micro pores,main current throat radius range is respectively 0.432-1.071 μm,0.364-0.411 μm and its flooding type changes from finger-net,net to immovable flooding.

关 键 词：特低渗储层 孔隙组合类型 可动流体饱和度 主流喉道半径 驱替类型 鄂尔多斯盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]