低电阻率砂岩油气层的测井饱和度计算新模型  

New Model for the Log-Based Saturation Calculation of Low-Resistivity Sandstone Reservoirs

作　　者：金力钻 孙玉红 周文革[1] 李松林 谢岚 JIN Lizuan;SUN Yuhong;ZHOU Wenge;LI Songlin;XIE Lan(China United Coalbed Methane CO.LTD.,Beijing 100083,China;Engineering Technology Company,CNOOC Energy Development CO.LTD.,Beijing 100083,China)

机构地区：[1]中联煤层气有限责任公司,北京100083 [2]中海油能源发展股份有限公司工程技术分公司,北京100083

出　　处：《测井技术》2020年第1期55-60,共6页Well Logging Technology

摘　　要：砂岩油气层饱和度模型很多,常用的有阿尔奇公式、印尼公式、西门杜公式、沃克斯曼斯密斯公式、双水模型等,这些模型在砂岩油气层饱和度计算方面发挥了关键作用。低电阻率砂岩油气层由于存在低电阻率现象,目前饱和度模型无法有效计算饱和度。通过分析低电阻率油气层形成的原因,认为水的分布即连通状态是影响储层电阻率的主要因素。在有效孔隙中少量分布的水与亲水岩石孔喉内壁水构成了网状导电网络,在高孔隙度和高矿化度储层条件下导致储层电阻率降低。通过研究油气层中少量水的高导电性现象,建立了等效水导电性影响因子,修改了常用的饱和度计算模型;该模型解决了原来常用饱和度模型无法描述少量水产生的高导电性问题,可提高低电阻率砂岩含油气饱和度计算结果,进而增加砂岩油气层计算储量规模。There are many saturation models for sandstone reservoirs,such as Archie formula,Indonesia formula,Simandoux model,W-S model and Dual-water model,which play a key role in calculating the saturation of sandstone oil/gas reservoirs.However,for sandstone reservoirs with low resistivity,none of the saturation models can effectively calculate their saturation.Causes of the low resistance is analyzed and attributed to water distribution or connectivity.A small amount of water in the effective pores and the water on the inner wall of the pore throat in hydrophilic rock form into a conductive network,which results in low resistivity of the reservoir with high porosity and high salinity.After studying the high conductivity of the small amount of water in sandstone oil/gas reservoirs,an equivalent factor of water conductivity is established,and then the commonly used saturation model is modified.The new model solves the problem that the original saturation model can’t describe the high conductivity generated by a small amount of water.It can improve the saturation calculation of low-resistivity sandstone oil/gas reservoirs,and accordingly increase the calculated reserves of sandstone oil/gas reservoirs.

关 键 词：测井解释 砂岩油气层 低电阻率成因 等效水导电性 饱和度模型 

分 类 号：P631.84[天文地球—地质矿产勘探]