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《Chinese Journal of Geophysics》 2006-01
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A study on the two-dimensional full-parameter inversion method ofthe electromagnetic propagation resistivity logging

KANG Jun-Zuo~1, XING Guang-Long~(1,2), YANG Shan-De~11 College of Physics, Jilin University, Changchun 130023, China2 College of Electronical Engineering, Yanshan University, Qinhuangdao 066004, China  
The multiple propagation resistivity tool (MPR) of the Baker-Hughes INTEQ is the widely used electromagnetic propagation resistivity logging tool. It has four phase difference curves and four amplitude ratio curves. With it as an example, we present a two-dimensional inversion method of the electromagnetic propagation resistivity logging data in vertical borehole. Because the sensitivity of logging response to the layer's boundary is much higher than that to other formation parameters, so how to accurately pick up the layer's boundary is important. The method described in this paper begins by picking the layer's boundaries from the highest resolution curve with the characteristic recognition method. It then performs vertical one-dimensional inversion to the shallow and deep detection phase difference curves. Utilizing this result to construct the initial model for two-dimensional inversion, this paper carries out the full-parameter inversion by using an improved damping regularized Gauss-Newton optimization algorithm. The satisfying inversion result is obtained for the two typical 23-layer models. The inverse result can significantly improve the quality of MPR interpretation. In addition, it is found that the inversion results from only five curves are nearly the same as the results from eight curves.
【Fund】: 国家自然科学基金项目(49774241)资助.
【CateGory Index】: P631.81
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