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

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

Authors :
J. Lofi
D. Smith
C. Delahunty
E. Le Ber
L. Brun
G. Henry
J. Paris
S. Tikoo
W. Zylberman
P. A. Pezard
B. Célérier
D. R. Schmitt
C. Nixon
Expedition 364 Science Party
Source :
Scientific Drilling, Vol 24, Pp 1-13 (2018)
Publication Year :
2018
Publisher :
Copernicus Publications, 2018.

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.

Subjects

Subjects :
Geology
QE1-996.5

Details

Language :
English
ISSN :
18168957 and 18163459
Volume :
24
Database :
Directory of Open Access Journals
Journal :
Scientific Drilling
Publication Type :
Academic Journal
Accession number :
edsdoj.656d809439a0412680c73f8c7f1baf10
Document Type :
article
Full Text :
https://doi.org/10.5194/sd-24-1-2018