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doi:10.2204/iodp.proc.322.201.2013

Introduction

In the absence of any density, neutron, or sonic data at Integrated Ocean Drilling Program (IODP) Site C0011, log-based porosity was calculated from the logging-while-drilling (LWD) resistivity data. Of the five available resistivity measurements (ring, bit, and three button), porosity was calculated from ring and bit resistivity. Bit and ring resistivity were chosen for comparison, as they provide two different resolutions. Bit resistivity measures directly behind the drill bit with a low vertical resolution (30–60 cm), whereas ring resistivity is a focused measurement with a vertical resolution of 5–8 cm (Schlumberger, 2007). The calculation of a bit resistivity–derived porosity at Site C0011 also ensures a consistent data set across the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) drilling transect, as LWD bit resistivity porosity was calculated at IODP Sites C0001–C0006 (Kinoshita et al., 2008).

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