White paper - RaMPS technology explained


Courtesy of Willowstick Technologies LLC

1. Introduction

RaMPS, which stands for Resistivity Mono-pole Profiling and Sounding, is a unique and proprietary geophysical survey and exploratory methodology developed by Willowstick Technologies by combining traditional resistivity sounding and profiling techniques into an integrated surveying method. It is not only unique in the way the data is acquired, but unique in the way the information is processed, plotted, and interpreted. Although similar in many respects to traditional resistivity surveys, the RaMPS methodology has proven to be more accurate and insightful than traditional resistivity for resolving geologic structures and lithology (horizontal and vertical alignment).

The RaMPS technology was first conceived many years ago by Jerry R. Montgomery, PhD, inventor of the patented AquaTrack geophysical technology and co-founder of Willowstick Technologies. While working as a senior geophysicist for a well known mining company, Dr. Montgomery performed a variety of resistivity profiling and sounding surveys in many geologic settings prior to exploratory excavation and drilling. In the process of comparing the physical observations with electrical property measurements obtained through traditional resistivity techniques, Dr. Montgomery observed that the resistivity pseudo-section plots (or subsurface cross-sections based on the theory of apparent resistivity) tended to misalign the anomalies with the corresponding structures observed in the excavation and drilling information. A further examination of the subject proved that in general, the interpretation of resistivity by traditional methods often yielded misleading information about the subsurface properties. The same holds true for induced polarization or IP data, which is collected and plotted with the same survey configurations. As a result, Dr. Montgomery began to develop a new methodology for resistivity profiling and sounding based on observations and theory. The new methodology involves some key changes to the survey configuration as well as the complementary data reduction, plotting, and interpretive procedures.

Since the time the original RaMPS methodology was conceived, Willowstick Technologies’ staff members have refined the data acquisition process as well as the processing, plotting, and modeling techniques that are currently used. As will be explained and demonstrated in this White Paper, the RaMPS technique has proven more accurate, insightful, and cost effective in comparison to traditional resistivity profiling and sounding techniques for resolving subsurface geology. The fundamental similarities and differences of the RaMPS and standard resistivity techniques are presented in this paper along with a case study applied to a deep and geologically complex site. However, because the survey configurations, data acquisition processes, data reduction and modeling practices are considered proprietary, some specific details of the RaMPS methodology are intentionally omitted.

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