基于双感应测井仪低数据量的反演方法研究

摘要

The reconstruction of the formation conductivity for the DualInduction Tool (DIT) measurement information using an efficient iterative method and Bi-conjugate gradient (BCG) was described. The inversion equation is derived based on the internal and external electrical field integral equation. In each iteration, the numerical mode matching (NMM) method was applied to solve a forward problem. Numerical simulations show that satisfactory inversion result of the complicated formation can be obtained from the incomplete measurement of DIT, which are in much good agreement with the true conductivity profile.%将一种迭代方法和双共轭梯度法用于实际工程中常用的双感应测井仪(DIT)的反演和剖面成象。基于目标区内、外电场积分方程，建立DIT的反演积分方程，利用MoM将积分方程离散为矩阵方程。在每次反演迭代过程中，用数值模式匹配法(NMM)求解DIT的感应电动势和格林函数。文中利用沿井轴的DIT不完备的低信息量对地层剖面进行反演，数值模拟结果表明该迭代方法的实际工程应用的潜力。