TITLE:
Lithological Characterization and Its Application Based on Three-Dimensional Structure-Coupled Joint Inversion of Gravity and Magnetic Data
AUTHORS:
Junjie Zhou, Xingdong Zhang, Chunxiao Xiu
KEYWORDS:
Lithological Characterization, Structure-Coupled Joint Inversion, Density Contrast, Magnetization
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.3,
March
13,
2015
ABSTRACT: Incorporating
structural-coupling constraint, known as the cross-gradients criterion, helps
to improve the focussing trend in cross-plot of multiple physical properties.
Based on this feature, apost-processing
technique is studied to characterize the lithological types of subsurface
geological materials after joint inversion. A simple domain transform, which
converts two kinds of participant physical properties into an artificial
complex array, is adopted to extract anomalies manually from homogenous host
rock. A synthetic example shows that structure-coupled joint inverted results
tend to concentrate on the feature trends in the cross-plot, and the main
geological targets are recovered well by a radius-azimuth plot. In a field data
example, the lithological characterizationreveals
that the main rock types interpreted in the study area agree with the
geological information, thus demonstrating the feasibility of this technique.