摘要
在垂直井眼的层状各向异性地层中,水平电阻率、垂直电阻率和各向异性指数(垂直电阻率与水平电阻率的比值)是其主要描述参数。常规测井评价只注重于水平电阻率信息而忽略了垂直电阻率和各向异性指数信息,这样对各向异性储层的含油饱和度评价就会产生误差。提出了在常规测井条件下在低阻层根据深浅侧向测井曲线出现差异而深中感应测井曲线重合来识别各向异性地层的方法,给出了根据双感应和双侧向测井曲线计算地层水平电阻率、垂直电阻率和各向异性指数的相关公式,这些方法可望能改善各向异性储层的含油饱和度评价。
Horizontal resistivity, vertical resistivity and anisotropic notation are the main electrical parameters of layered anisotropic formation in the vertical well. In the standard evaluation some errors will occur when computing the oil saturations of anisotropic reservoirs since the anisotropic formations are regarded as isotropic formations and only the horizontal resistivities are used regardless of the vertical resistivities and anisotropic notations. The method for identifying layered anisotropic formations is brought forward according to the difference between the deep laterolog and the shallow laterolog and the same between the deep induction log and the moderate induction log in the low resistivity formations. The relative equations to calculate the horizontal resistivity, vertical resistivity and anisotropic notation are given by use of the dual induction log and the dual laterolog in standard well logging. The methods described can be used to improve the evaluation of oil saturations in the reservoirs.
出处
《测井技术》
CAS
CSCD
2003年第3期194-197,共4页
Well Logging Technology
基金
国家自然科学基金(No.40274018)
关键词
测井
含油饱和度
层状各向异性地层
识别
评价
水平电阻率
垂直电阻率
双感应
双侧向
anisotropy horizontal resistivity vertical resistivity anisotropic notation dual induction log dual laterolog oil saturation evaluation
