Seismic studies around the Kola Superdeep Borehole, Russia

被引:30
作者
Ganchin, YV [1 ]
Smithson, SB
Morozov, IB
Smythe, DK
Garipov, VZ
Karaev, NA
Kristofferson, Y
机构
[1] Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA
[2] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland
[3] Russian State Comm Geol, Moscow 123242, Russia
[4] VIRG Rudgeofiz, St Petersburg, Russia
[5] Univ Bergen, Inst Solid State Phys, N-5007 Bergen, Norway
基金
美国国家科学基金会;
关键词
borehole; CDP; VSP; reflections; Kola;
D O I
10.1016/S0040-1951(97)00280-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Kola Superdeep Borehole (SG-3) provided an ideal opportunity to test hypotheses on the origins of crustal reflections and on the presence and seismic expression of fluids in the upper crust. The alternative sources of crustal reflections include compositional changes, shear zones, fluids, and metamorphic facies changes, all of which are represented at the well. Both the 38-km-long CDP section and the borehole VSPs in the range 2.2-6.0 km demonstrate the presence of reflections from dipping compositional layering, shear zones, and fluid-filled zones. Subhorizontal reflectivity zones are interpreted as horizontal fluid-filled fracture-type reservoir rocks. Results suggest the presence of fluids down to a depth of at least 12 km in the upper crust; the presence of these fluids lowering seismic velocity causes estimates of upper crustal composition to be too felsic. (C) 1998 ELsevier Science B.V.
引用
收藏
页码:1 / 16
页数:16
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