Drilling-induced and logging-related features illustrated from IODP–ICDP Expedition 364 downhole logs and borehole imaging tools.

Johanna Lofi 1, * David Smith 2 Chris Delahunty 3 Erwan Le Ber 4 Laurent Brun 1 Gilles Henry 1 Jehanne Paris 1 Sonia Tikoo 5 William Zylberman 6 Philippe Pezard 1 Bernard Celerier 1 Douglas R. Schmitt 7, 8 Chris Nixon 9 Sean P.S. Gulick 10, 11 Joanna V. Morgan 12 Elise Chenot 13 Gail L. Christeson 11, 10 Philippe Claeys 14 Charles S. Cockell 15 Marco J.L. Coolen 16 Ludovic Ferrière 17 Catalina Gebhardt 18 Kazuhisa Goto 19 Sophie Green 20 Heather Jones 21 David A. Kring 22 Christopher M. Lowery 10, 11 Claire Mellett 20 Rubén Ocampo-Torres 23 Ligia Perez-Cruz 24 Annemarie E. Pickersgill 25 Michael Poelchau 26 Auriol S.P. Rae 12 Cornelia Rasmussen 10, 11 Mario Rebolledo-Vieyra Ulrich Riller 27 Honami Sato 28 Jan Smit 29 Naotaka Tomioka 30 Jaimie Urrutia-Fucugauchi 24 Michael T. Whalen 31 Axel Wittmann 32 Xiao Long 33 Kosei E. Yamaguchi 34 Timothy J. Bralower 21
* Corresponding author
Abstract : Expedition 364 was a joint IODP and ICDP mission-specific platform (MSP) expedition to explore the Chicxulub impact crater buried below the surface of the Yucatán continental shelf seafloor. In April and May 2016, this expedition drilled a single borehole at Site M0077 into the crater's peak ring. Excellent quality cores were recovered from ∼505 to ∼1335 m below seafloor (m b.s.f.), and high-resolution open hole logs were acquired between the surface and total drill depth. Downhole logs are used to image the borehole wall, measure the physical properties of rocks that surround the borehole, and assess borehole quality during drilling and coring operations. When making geological interpretations of downhole logs, it is essential to be able to distinguish between features that are geological and those that are operation-related. During Expedition 364 some drilling-induced and logging-related features were observed and include the following: effects caused by the presence of casing and metal debris in the hole, logging-tool eccentering, drilling-induced corkscrew shape of the hole, possible re-magnetization of low-coercivity grains within sedimentary rocks, markings on the borehole wall, and drilling-induced changes in the borehole diameter and trajectory.
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Johanna Lofi, David Smith, Chris Delahunty, Erwan Le Ber, Laurent Brun, et al.. Drilling-induced and logging-related features illustrated from IODP–ICDP Expedition 364 downhole logs and borehole imaging tools.. Scientific Drilling, Copernicus Publications, 2018, 24, pp.1-13. ⟨https://www.sci-dril.net/24/1/2018/⟩. ⟨10.5194/sd-24-1-2018⟩. ⟨hal-01927738⟩

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