用三维有限元素法反演单一灰岩裂缝性储层的裂缝孔隙度和裂缝倾角

Inverting Fracture Porosity and Dip of Limestone Fractured Reservoir Using 3 D FEM

李善军．用三维有限元素法反演单一灰岩裂缝性储层的裂缝孔隙度和裂缝倾角．测井技术，１９９８，２２（６）：４１２～４１５灰岩的裂缝性储层是由裂缝孔隙度和裂缝倾角决定的各向异性介质。在裂缝性储层中，泥浆的侵入深度通常超过双侧向测井仪器的探测范围。此文没有采用电法测井只反演地层不同径向深度电阻率的方法，而是在假定裂缝内为单一流体的条件下，利用三维有限元素法，成功地反演出裂缝孔隙度和裂缝倾角，为利用双侧向测井响应对灰岩裂缝性地层的储层参数进行解释提供了可能。

Limestone fractured reservoir are anisotropic media determined by fracture porosity and fracture dip. In the fractured reservoir, the invasion depth of mud usually exceeds the investigation range of dual laterologing tool. In this paper the inversion method of electrical logging isnt used in which only the resistivities of the formation of different radial depth are inverted. Suppose there is only one kind of fluid in fracture. The fracture porosity and fracture dip are successfully inverted with 3 D FEM, which makes it possible that the parameters of the limestone fractured reservoir are accurately interpreted from dual laterolog response.