globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228337
论文题名:
Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)
作者: Wang B.; Sun D.; Chen Q.; Lin W.; Li A.-W.; Cao H.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 777
语种: 英语
中文关键词: Anelastic strain recovery method ; In-situ stress ; SK-II borehole ; Songliao Basin ; Stress state difference
英文关键词: Boreholes ; Buildings ; Sedimentology ; Stresses ; Strike-slip faults ; Anelastic strain recovery ; In-situ stress measurement ; Insitu stress ; Maximum principal stress ; Scientific drilling ; Seismic reflection profiles ; Songliao basin ; Stress state ; Fault slips ; anelasticity ; basement rock ; borehole ; depth ; drilling ; in situ measurement ; normal fault ; Pacific plate ; sedimentary basin ; seismic reflection ; strain analysis ; stress field ; China ; Songliao Basin
英文摘要: The stress state down to the basement within sedimentary basins yet remains poorly understood. The anelastic strain recovery (ASR) method was employed to measure the stress state in the SK-II borehole in the Songliao Basin, Northeast China. The results show that the stress state differs significantly between the sedimentary cover and basement. In the sedimentary cover (6296–6335 m), the maximum principal stress σ1 is nearly vertical, which is in the normal faulting stress regime dominated by gravitation, in accordance with the normal faults observed on seismic reflection profiles within the sedimentary cover. In contrast, the basement (6646–6846 m) shows that σ1 is nearly horizontal, suggesting a strike-slip or reverse-faulting regime. The stress state of the basement is close to the reasonable stress condition for the Eurasian Plate far from a western Pacific plate subduction zone and consistent with the focal mechanisms of earthquakes (7–15 km) in the vicinity of ICDP SK-II borehole. The difference of stress state may imply that the far-field stress generated by the western Pacific plate has limited effects on the sedimentary cover, an increase in thickness correlates with an increasing influence of tectonic stress with depth. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170726
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作者单位: Key Laboratory of Active Tectonics and Crustal Stability Assessment, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan

Recommended Citation:
Wang B.,Sun D.,Chen Q.,et al. Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)[J]. Tectonophysics,2020-01-01,777
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