Abstract
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.
Highlights
Expedition 364 was a joint International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Program (ICDP) Mission Specific Platform (MSP) expedition (Morgan et al, 2017)
As for all MSP expeditions, the downhole logging program was coordinated by the European Petrophysics Consortium (EPC), which is part of the European Consortium for Ocean Drilling (ECORD) Science Operator (ESO)
The ABI downhole tool used during Expedition 364 produces a 1.2 MHz ultrasonic pulse sent toward the borehole wall
Summary
Expedition 364 was a joint International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Program (ICDP) Mission Specific Platform (MSP) expedition (Morgan et al, 2017) It drilled and cored a single borehole (Hole M0077A) at a shallow water depth in the Chicxulub impact crater buried below the surface of the Yucatán continental shelf (Mexico). Downhole wireline logging tools are used to measure a suite of physical properties within the rocks surrounding the borehole as well as to image the borehole wall These logs provide critical geological information about the rock formations close to the borehole, including their lithology, fluid content, porosity, and structural data such as the presence of faults and fractures. We will show how downhole logs have been used to improve the post-operation understanding of the drilling and coring operation history
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