对任意一条无重点且过原点的分段光滑闭合曲线L,计算第二类曲线反常积分integral from L to (xdy-ydx)/(x^2+y^2).将一般闭合曲线L上的曲线积分转换成特殊扇形边界线上的积分,再由定义得到积分值.待求积分值为L在原点处两切线所夹角度,...对任意一条无重点且过原点的分段光滑闭合曲线L,计算第二类曲线反常积分integral from L to (xdy-ydx)/(x^2+y^2).将一般闭合曲线L上的曲线积分转换成特殊扇形边界线上的积分,再由定义得到积分值.待求积分值为L在原点处两切线所夹角度,夹角朝向L包围的区域,L正向时积分值为正,反之积分值为负.展开更多
During the process of coal prospecting and exploration, different measurement time, different logging instruments and series can lead to systematic errors in well logs. Accordingly, all logging curves need to be norma...During the process of coal prospecting and exploration, different measurement time, different logging instruments and series can lead to systematic errors in well logs. Accordingly, all logging curves need to be normalized in the mining area. By studying well-logging normalization methods, and focusing on the characteristics of the coalfield, the frequency histogram method was used in accordance with the condition of the Guqiao Coal Mine. In this way, the density and sonic velocity at marker bed in the non-key well were made to close to those in the key well, and were eventually equal. Well log normalization was completed when this method was applied to the entire logging curves. The results show that the scales of logging data were unified by normalizing coal logging curves, and the logging data were consistent with wave impedance inversion data. A satisfactory inversion effect was obtained.展开更多
文摘对任意一条无重点且过原点的分段光滑闭合曲线L,计算第二类曲线反常积分integral from L to (xdy-ydx)/(x^2+y^2).将一般闭合曲线L上的曲线积分转换成特殊扇形边界线上的积分,再由定义得到积分值.待求积分值为L在原点处两切线所夹角度,夹角朝向L包围的区域,L正向时积分值为正,反之积分值为负.
基金Supported by the National Basic Research Program of China （2009CB219603, 2010CB226800） the National Natural Science Foundation of China （40874071, 40672104）
文摘During the process of coal prospecting and exploration, different measurement time, different logging instruments and series can lead to systematic errors in well logs. Accordingly, all logging curves need to be normalized in the mining area. By studying well-logging normalization methods, and focusing on the characteristics of the coalfield, the frequency histogram method was used in accordance with the condition of the Guqiao Coal Mine. In this way, the density and sonic velocity at marker bed in the non-key well were made to close to those in the key well, and were eventually equal. Well log normalization was completed when this method was applied to the entire logging curves. The results show that the scales of logging data were unified by normalizing coal logging curves, and the logging data were consistent with wave impedance inversion data. A satisfactory inversion effect was obtained.
