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Deep ice drilling, bedrock coring and dust logging with the Rapid Access Ice Drill (RAID) at Minna Bluff, Antarctica
Annals of Glaciology ( IF 2.9 ) Pub Date : 2021-07-05 , DOI: 10.1017/aog.2021.13
John W. Goodge 1 , Jeffrey P. Severinghaus 2 , Jay Johnson 3 , Delia Tosi 4 , Ryan Bay 5
Affiliation  

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.

中文翻译:

在南极洲明纳布拉夫使用 Rapid Access Ice Drill (RAID) 进行深冰钻探、基岩取芯和灰尘测井

Rapid Access Ice Drill是一种新型钻探技术,能够快速进入南极冰盖的冰床,取回冰芯和岩芯样品,并为井下物性测井提供钻孔。科学目标包括寻找冰床附近的旧冰和采集冰下基岩。在 2019-20 年南方夏季,在 Minna Bluff 山前冰川的 McMurdo 站附近的现场试验中,我们通过 (1) 钻探通过冷杉,(2) 创建一个无孔冰中的钻孔封隔器密封,(3) 建立流体循环,(4) 以高达 1.2 m/min 的穿透率在冰中快速钻孔-1, (5) 在深度处获得一个短冰芯, (6) 在约 677 m 深度处穿透冰床, (7) 恢复 3.2 m 冰芯、基底冰层和冰下基岩, (8) 光学测井电缆上的钻孔,(9) 通过对钻孔流体超压来测试水力压裂潜力,以及 (10) 在环境友好但快速的现场模式下运行。因此,Minna Bluff 测试证明了这种集成系统在快速钻穿厚冰并穿透冰川床以获取基岩核心方面的有效性。
更新日期:2021-07-05
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