- 责任者：Tan Maojin (Key Laboratory of Geo-detection ; China University of Geosciences ; Ministry of Education ; Beijing 100083 ; China) ; Gao Jie
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(4)
- 关键词：双侧向测井 ; dual laterolog
- 页码：p.1422-1432
- 图表：5 illus., 18 tables, 6 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
In directional wells such as deviated wells and horizontal wells, dual laterolog of resistivity is usually not accurate enough due to some environmental factors such as borehole, surrounding bed, well deviation, radial invasion zone and so on, so it is difficult for fluid identification and quantitative evaluation of the reservoirs. The method of chart correction and invasion inversion is proposed to study apparent resistivity correction of dual laterolog. Firstly, according to borehole size and drilling fluid properties, the dual laterolog resistivity responses are calculated with three dimensional finite element method（3D FEM） and the borehole correction charts are constructed. Then, according to all kinds of formation models with different deviation angles and bed thickness, the resistivity responses are computed and the well deviation and surrounding bed or thickness correction charts are built. Finally, with respect to the effect of drilling fluid invasion, the invasion radius and true resistivity of the formation are calculated using the inversion method, and the environment correction for dual laterolog is achieved completely. After the theory is applied to dual laterolog data in marine deviated well, the dual laterolog resistivity correction results can enhance the accuracy of qualitative identification and quantitative evaluation of the reservoirs.