Gravity Magnetic Conjugate Gradient Focusing Inversion Research And Application

As gravity exploration equipment precision, the improvement of data processingand interpretation, as well as increasing difficulty of the mining and oil and gasexploration, gravity magnetic inversion technique is extensively attentioned byscholars both at home and abroad.Based on deeping research in the geophysical inversion technique, gravitymagnetic inversion technology and the theory of optimization, the author puts forwardthe more constrained conjugate gradient focusing and joint inversion strategy.In thispaper, the integral sensitivity, roughness and minimum support functional constraintas well as the reference model and model parameter boundary constraint is introducedinto the objective function,and the conjugate gradient method is adopted to improvethe inversion iteration.In addition,Using the split unit between geometric structure’sequivalence, this paper realizes the three-dimensional fast forward calculation ofgravity magnetic field and gradient，and its optimization of derivative matrixstorage.In the end, the inversion algorithm of this paper is produced.In the case of full tensor gravity gradient data, tried to the three-dimensionalinversion calculation, Through the smooth inversion, focusing inversion and noiseinterference inversion of from simple to complex variety of model, and comparisonanalysis. The results show that the inversion algorithm is an efficient, reliable, and thestability of the algorithm.Last，in Li Shu Sag and Ben Xi–Lin Jiang two study area, applying the conjugategradient focusing inversion technique. Finally,accurately predict the three dimensionalstructure characteristics of deep in the study areas, to illustrate the practicability andthe broad application prospect of the algorithm.