Deep ice drilling, bedrock coring and dust logging with the Rapid Access Ice Drill (RAID) at Minna Bluff, Antarctica

IF 2.5 4区 地球科学 Q2 GEOGRAPHY, PHYSICAL Annals of Glaciology Pub Date : 2021-07-05 DOI:10.1017/aog.2021.13
J. Goodge, J. Severinghaus, Jay A. Johnson, D. Tosi, R. Bay
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引用次数: 9

Abstract

Abstract Rapid Access Ice Drill is a new drilling technology capable of quickly accessing the glacial bed of Antarctic ice sheets, retrieving ice core and rock core samples, and providing boreholes for downhole logging of physical properties. Scientific goals include searching for old ice near the glacial bed and sampling subglacial bedrock. During field trials near McMurdo Station on a piedmont glacier at Minna Bluff in the 2019–20 austral summer, we successfully completed a ‘top-to-bottom’ operational sequence in three boreholes by (1) augering through firn, (2) creating a borehole packer seal in non-porous ice, (3) establishing fluid circulation, (4) quickly drilling a borehole in ice at penetration rates up to 1.2 m min−1, (5) acquiring a short ice core at depth, (6) penetrating the glacial bed at a depth of ~677 m, (7) recovering a 3.2 m core of ice, basal till and subglacial bedrock, (8) optically logging the borehole on wireline, (9) testing hydrofracture potential by overpressuring the borehole fluid and (10) operating in an environmentally benign yet rapid field mode. Minna Bluff testing, therefore, demonstrates the effectiveness of this integrated system to drill rapidly through thick ice and penetrate across the glacial bed to take cores of bedrock.
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在南极洲Minna Bluff使用快速存取冰钻(RAID)进行深冰钻探、基岩取芯和粉尘记录
快速进入冰钻是一种能够快速进入南极冰盖冰床,提取冰芯和岩芯样品,并为井下物性测井提供钻孔的新型钻井技术。科学目标包括在冰川床附近寻找古老的冰,并对冰下基岩进行取样。麦克默多站在山麓冰川附近在田间试验在2019 - 20的明娜虚张声势南国的夏天,我们成功地完成了一个“自上而下”三个钻孔的操作序列(1)通过积雪螺旋钻法,(2)创建一个井下封隔器密封在无孔的冰,(3)建立流体循环,(4)快速钻井井眼在冰普及率高达1.2分钟−1,(5)获得一个简短的冰芯深度,(6)穿透深度的冰川床~ 677,(7)回收3.2米厚的冰芯、基岩和冰下基岩;(8)用电缆对井眼进行光学测井;(9)通过对井眼流体进行超压测试水力压裂的潜力;(10)以一种环保但快速的现场模式进行作业。因此,Minna Bluff测试证明了该综合系统在快速钻穿厚冰并穿透冰川床获取基岩岩心方面的有效性。
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来源期刊
Annals of Glaciology
Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.
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