Abstract
Using Integrated 2D and 3D Resistivity Imaging Methods for Illustrating the Mud-Fluid Conduits of the Wushanting Mud Volcanoes in Southwestern Taiwan
Highlights
Two-dimensional (2D) surface-based resistivity surveys have been used widely in different shallow subsurface explorations (e.g., Daily et al 1992; Yang et al 2002; Yang et al 2005; Cassiani et al 2006; Cheng et al 2008 )
Because the 2D survey lines were aligned across the entire Wushanting Natural Landscape Preservation Area (WNLPA) and the 3D arrays were focused on the two major structures, we further combined the 2D and 3D measurements into a jointed data file and attempted to invert them together for illustrating the fracture systems in the WNLPA
The 3D resistivity images resolved the conductive body in the looped arrays, we found that the locations of the two conductive regions were inconsistent with the positions of the two mud volcano outlets
Summary
Two-dimensional (2D) surface-based resistivity surveys have been used widely in different shallow subsurface explorations (e.g., Daily et al 1992; Yang et al 2002; Yang et al 2005; Cassiani et al 2006; Cheng et al 2008 ). The 2D sections have been combined to form reasonably accurate images of three-dimensional (3D) structures (e.g., Bernstone et al 1997; Dahlin and Loke 1997); 3D techniques (Loke and Barker 1996; Slater et al 2002) for resistivity surveys may have to be considered if one has to illustrate detailed subsurface structures in a strongly heterogeneous environment (Dahlin et al 2002). Through the 3D resistivity model, we tried to illustrate the dual-porosity structures (i.e., the vertical fractures filled with mud fluids and the horizontal groundwater surface of saturated pore media), and to construct a conceptual model of the fracture systems in the WNLPA
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