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Puchalski, Michael1, Mitch D. Pavlovic1 
(1) Baker Atlas, Houston, TX

ABSTRACT: Stratigraphic and Sedimentological Characterization using Micro-Resistivity Imaging Logs in Wells Drilled with Non-Conductive Mud

The use of micro-resistivity imaging has become increasingly integral to formation evaluation by exploration teams prior to field development. Recent developments in drilling technology as well as, increasingly ambitious exploration strategies, have necessitated the use of oil or synthetic base mud systems to efficiently and safely reach exploration targets. Thus, it was imperative to develop a new micro-resistivity imaging technology that would operate in various oil, diesel or synthetic muds, allowing flexibility in the mud system design. 
Exploration and development in the Rocky Mountain region of the United States has provided a unique opportunity to test and apply this new technology in a commercial setting. The complexity of the region validates the instrument’s functionality and application throughout a range of geological environments and borehole conditions. Also, many wells in the region that precluded the use of micro-resistivity imaging tools because of mud composition can now be successfully logged and incorporated into regional models. Together with conventional open hole logging techniques, high-resolution, oil-based image logs provide much needed information during the early exploration stage of a basin-centered gas play. 
This paper will catalogue the wide range of stratigraphic and sedimentological information that may be gleaned from the use of this new technology. Field examples from the Rocky Mountain region along with outcrop and core analogues will be presented and discussed in detail.


AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.