摘要
采用有限元分析软件ANSYS对裂缝的双侧向测井视电阻率与裂缝孔隙度、泥浆电阻率、裂缝倾角和基岩电阻率的关系进行了计算 .在大量正演数据的基础上得出双侧向测井响应反演公式和裂缝孔隙度计算公式 ,提出更为精细的裂缝倾角的弹性划分模型 ,用双侧向视电阻率值近似估算裂缝倾角的方法 ,提高了利用双侧向测井求裂缝产状与裂缝孔隙度 (裂缝宽度 )的精度 .
We use ANSYS, a large general finite element method software, to compute the dual laterolog response to parallel fractures of equal spacing in the carbonate formation crossing a borehole. The relationship between the dual laterolog response and fracture porosity, fracture dip-angle, base rock resistivity and fluid resistivity are discussed. Based on the analysis of numerical simulation results and the characterizations of dual laterolog response to fractures, a new method is developed to classify the forms of fractures, which can dynamically change the definition of fracture dip-angle range to fit different instances. The technique to obtain the approximate dip-angles of fractures with dual laterolog response is realized. It can greatly prove the estimation of fracture porosity (aperture of fracture). With the condition of constant fracture dip-angles, the inversion model of the dual laterolog response and formula for computing fracture porosity are presented.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第2期359-363,共5页
Chinese Journal of Geophysics
基金
中国石油化工集团新星公司重点科研基金项目 (XYK2 0 0 1-4 7-2 )
关键词
测井
裂缝
碳酸盐岩
有限元
正演
Numerical simulation, Dual laterolog response, Fractured carbonate formation, 3-D finite element method.
