特低渗储层可动流体饱和度研究——以甘谷驿油田长6储层为例

发布时间：2018-01-12 10:22

本文关键词：特低渗储层可动流体饱和度研究——以甘谷驿油田长6储层为例　出处：《地球物理学进展》2017年02期 　论文类型：期刊论文

【摘要】：特低渗储层油水分布关系复杂、微观孔喉网络分布模式及油水微观渗流机理复杂多变、水驱效率低、开发矛盾突出.可动流体饱和度是精细评价特低渗储层的关键因素,因此,利用铸体薄片、扫描电镜、X衍射、常规压汞、恒速压汞、核磁共振等实验手段,研究分析甘谷驿油田长6储层可动流体饱和度的分布特征及主控因素.结果表明:研究区长6储层的可动流体饱和度偏小,平均值为37.42%.微观孔隙结构是控制可动流体饱和度大小的主要因素,粘土矿物次之,储层物性的影响最弱.渗透率对可动流体饱和度的敏感性显著强于孔隙度.孔隙连通性好,孔喉比小,喉道半径粗、残余粒间孔保存较好、次生孔隙发育,粘土矿物含量小,可动流体饱和度相对较高.粒间孔的剩余程度、溶孔及喉道的发育程度等对储层的好坏及可动流体饱和度的大小具有至关重要的作用.孔隙特征参数中,喉道半径,孔隙半径,孔喉比、单位体积总有效孔喉体积与可动流体饱和度的关系更为密切.
[Abstract]:The relationship between oil and water distribution in ultra-low permeability reservoir is complex, the distribution pattern of micro-pore and throat network and the mechanism of oil-water micro-seepage are complex and changeable, and the efficiency of water drive is low. Development contradiction is prominent. Movable fluid saturation is the key factor for fine evaluation of ultra-low permeability reservoirs. Therefore, the use of casting thin slice, scanning electron microscope X diffraction, conventional mercury injection, constant speed mercury pressure, nuclear magnetic resonance and other experimental means. The distribution characteristics and main controlling factors of movable fluid saturation in Chang6 reservoir of Ganguyi oilfield are studied. The results show that the movable fluid saturation of Chang-6 reservoir in study area is small. The average value is 37.42. The micropore structure is the main factor to control the saturation of movable fluid, followed by clay minerals. The sensitivity of permeability to movable fluid saturation is significantly stronger than that of porosity. The porosity connectivity is good, the pore throat ratio is small, the throat radius is coarse, the residual intergranular pores are well preserved and the secondary pores are developed. The clay mineral content is small, the movable fluid saturation is relatively high, and the residual degree of intergranular pore is relatively high. The development of dissolved pore and throat plays an important role in reservoir quality and the size of movable fluid saturation. Among the pore characteristic parameters, throat radius, pore radius, pore throat ratio. The total effective pore throat volume per unit volume is more closely related to the movable fluid saturation.
【作者单位】：陕西延长石油(集团)有限责任公司研究院;吉林省有色金属地质勘查局研究所;
【基金】：陕西省科技统筹创新工程(2014KTZB03-02) 国家科技支撑计划课题(2012BAC26B03)联合资助
【分类号】：P618.13;TE311
【正文快照】： 0 引言目前我国中、高渗油藏的稳产难度日益加大,低渗、特低渗透油气资源做为一个世界性难点、热点,必将推向历史的舞台,成为石油行业可持续发展的主战场,用以缓解能源安全问题(胡文瑞和翟光明,2010;邹才能等,2010).据国家最新一轮油气资源评估,全国石油资源总量为1086亿吨,

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