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

发布时间：2018-08-24 15:53

【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。
[Abstract]:In order to effectively overcome the effect of heterogeneity of ultra-low permeability reservoir on water injection development, it is the first time to combine with the experiments of high pressure mercury injection, constant velocity mercury pressure, nuclear magnetic resonance (NMR) and real sandstone water flooding from the point of view of pore assemblage type. The reservoir characteristics of waterflooding development are characterized quantitatively from macro and micro aspects: the main throat radius and movable fluid saturation of different pore assemblages are calibrated. The displacement types of different pore assemblages and the occurrence state of residual oil are defined. The results show that the reservoir has good physical properties, low compaction rate, low cementation rate and high oil saturation. Its movable fluid saturation is the highest, easy to form the dominant channel. The main throat radius of dominant channel is 0.9631,494 渭 m, and the main displacement type is finger displacement, which is the main remaining oil accumulation area, and the intergranular pore-solution-pore type and dissolved pore-micropore, microporous reservoir become worse in turn. The radius of the main throat is 0.432U 1.071 渭 m and 0.364N 0.411 渭 m respectively. The displacement type is gradually transferred to the finger-reticular displacement and the reticular displacement until the displacement does not move.
【作者单位】：陕西延长石油(集团)有限责任公司研究院;
【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
【分类号】：TE312

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