鄂尔多斯盆地白豹油田致密砂岩储层孔喉结构及NMR分形特征  

Pore Throat Structure and NMR Fractal Characteristics of Tight Sandstone Reservoirs in Baibao Oilfield,Ordos Basin

作　　者：郝栋 杨晨 刘晓东 王亮 HAO Dong;YANG Chen;LIU Xiaodong;WANG Liang(No.7 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi’ an,Shaanxi 710000,China)

机构地区：[1]中国石油长庆油田分公司第七采油厂,陕西西安710000

出　　处：《西安石油大学学报（自然科学版）》2021年第5期34-45,共12页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2011ZX05044);陕西省科技统筹创新工程基金资助项目(2015KTCL01-09)。

摘　　要：为了研究白豹油田致密砂岩储层孔喉结构,结合铸体薄片、高压压汞、恒速压汞及核磁共振技术(NMR),并应用分形理论进行分析。研究结果表明:致密砂岩储层以微米级孔喉为主,孔喉配置关系复杂,非均质性强,NMR孔喉分形维数具有两段式分布特征,细小孔喉分布较为均质,较大的可动流体的孔喉结构复杂。可动流体孔喉结构越复杂,渗透率、可动流体饱和度越低。孔喉结构复杂程度是影响储层渗流能力的一个关键因素;石英和填隙物含量是形成不同孔喉结构的物质基础;孔喉尺寸越大,连通性越好,配置关系越好,则分形维数越小,结构更为均质,更有利于流体渗流。The pore throat structure of tight sandstone reservoir in Baibao oilfield is studied by casting thin section,high pressure mercury injection,constant velocity mercury injection and nuclear magnetic resonance(NMR),and analyzed by fractal theory.The results show that the tight sandstone reservoir is dominated by micron pore throat,the pore throat configuration relationship is complex,the heterogeneity degree of the pore throa is high,the fractal dimension of NMR pore throat has the characteristics of two-segment distribution,the distribution of fine pore throat is relatively homogeneous,and the structure of larger movable fluid pore throat is highly complex.The more complex the structure of movable fluid pore throat,the lower the permeability of reservoir and saturation of movable fluid.The complexity of pore throat structure is a key factor affecting reservoir seepage ability;The content of quartz and pore filling substance is the material basis for the formation of different pore throat structures;The larger the pore throat size,the better the pore throat connectivity and the better the pore throat configuration relationship,the smaller the fractal dimension and the more homogeneous the pore throat structure,which is more conducive to fluid seepage.

关 键 词：孔喉结构 NMR分形特征 可动流体 致密砂岩储层 

分 类 号：TE122[石油与天然气工程—油气勘探]