Characterization of a coalesced, collapsed paleocave reservoir analog using GPR and well-core data

摘要

The three-dimensional architecture, spatial complex- ity, and pore-type distribution are mapped in a near- surface analog of a coalesced, collapsed paleocave system in the Lower Ordovician Ellenburger Group near the city of Marble Falls in central Texas. The surface area of the site has dimensions of about 350×1000 m. The data collected include about 12 km of 50-MHz ground- penetrating radar(GPR)data arranged in a grid of orthogonoal lines, 29 cores of about 15-m length, and detailed facies maps of an adjacent quarry face. Elec- trical property measurements along with detailed core descriptions were the basis of integrated interpretation of the GPR data.