基于有限体积法的感应测井响应快速模拟

Fast simulation of induction logging response by finite volume method

感应测井是定量评价砂泥岩储层含油气性的主要测井方法之一,开展快速而准确的感应测井响应数值模拟对资料采集和地层解释都有着重要的作用。为了克服有限元及有限差分等数值模拟方法的不足,首次引入有限体积法(FVM)计算感应测井在地层中的响应。有限体积法的核心思想简单,容易实现非结构网格剖分的计算,能更好地拟合不规则的地层形状,从而达到较好的模拟精度。首先详细论述了有限体积法的基本思想;然后给出了有限体积法在感应测井数值模拟中的具体实施办法;最后通过编制的计算程序对两个实际的地层模型进行了计算,均取得了比较理想的模拟结果。

Induction logging is an important means for quantitatively evaluating hydrocarbon bearing in sand and shale reservoirs,fast and accurate numerical simulation on induction logging response is important for data acquisition and formation interpretation.In order to overcome the disadvantages of finite element and finite difference simulation methods,we introduced Finite Volume Method(FVM)to calculate response of induction logging for the first time.FVM is easy to calculate response of indution logging in unstructured grid division which can fit the irregular shape of formation and obtain good simulation accuracy.We firstly discussed the basic idea of finite volume method in detail,and then gave a specific implementation to simulate response of induction logging.Finally,the developed FVM program analog was used to compute two models,and ideal simulation results were achieved.