Wellbore breakouts of the main borehole of Chinese Continental Scientific Drilling (CCSD) and determination of the present tectonic stress state

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	Wellbore breakouts of the main borehole of Chinese Continental Scientific Drilling (CCSD) and determination of the present tectonic stress state
	Cui, JW (Cui, Jun-wen)5; Wang, LJ (Wang, Lian-jie); Li, PW (Li, Pengwu); Tang, ZM (Tang, Zhe-min); Sun, DS (Sun, Dong-sheng)
刊名	TECTONOPHYSICS
	2009
卷号	475 期号:2 页码:220-225
关键词	Sulu-Dabie HP-UHP metamorphic belt Chinese Continental Scientific Drilling (CCSD) Wellbore breakouts Horizontal principal stress Strike-slip fault Stress state
ISSN号	0040-1951
英文摘要	The Sulu-Dabie high-pressure (HP)-ultra high-pressure (UHP) metamorphic belt as the product of subduction-collision between the northern China plate and Yangtze plate underwent a process of formation and evolution from deep subduction -> exhumation -> extension -> slow uplift. The study of its modern tectonic stress field has great significance fora complete understanding of the process of formation and evolution of the HP-UHP metamorphic belt, especially the exhumation and uplift of the belt. Wellbore breakouts are the most visual tectonic phenomenon which can characterize the modem stress action in the main borehole of Chinese Continental Scientific Drilling (CCSD). Ultrasonic borehole televiewer reflection wave data show that wellbore breakouts began to occur at 1216 m depth of the main borehole. A total of 143 borehole televiewer images were collected from 1216 to 5118 m depth (hole completion depth). After data processing and statistics, the average azimuth of the long dimension of the wellbore breakout obtained was 319.5 degrees +/- 3.5 degrees, indicating that the average azimuth of the maximum horizontal principal stress causing wellbore breakout initiation was 49.5 degrees +/- 3.5 degrees. The maximum and minimum horizontal principal stress values at 52 depths in the interval of 1269 to 5047 m were estimated using the elements of wellbore shapes (wellbore depth and width), combined with the cohesive strength and internal frictional angle of the rock obtained by rock mechanical tests on samples, and the static load stresses at corresponding depths were calculated according to the rock density logging data. The results indicate that the maximum and minimum horizontal principal stresses are 41.4 and 25.3 MPa at 1269 m depth respectively and 164.7 and 122 MPa at 5047 m depth respectively; the maximum vertical stress is 141.3 MPa at 5047 m depth with a density of 2.8 g/cm(3); the in-situ stresses increase nearly linearly with depth. The magnitudes and directions of the three principal stresses reflect that the regional stress field around the CCSD main borehole is mainly in a strike-slip state, which is consistent with the basic features of the regional stress field determined using other methods. (C) 2009 Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	AUBURN GEOTHERMAL WELL ; INSITU STRESS ; DEFORMATION ; ORIENTATION ; ELONGATION ; TELEVIEWER ; MAGNITUDE ; FIELD
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000271331800003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39082]
专题	中国地质调查局
作者单位	1.[Wang, Lian-jie 2.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China [Cui, Jun-wen 3.Li, Pengwu 4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 5.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Cui, JW ,Wang, LJ ,Li, PW ,et al. Wellbore breakouts of the main borehole of Chinese Continental Scientific Drilling (CCSD) and determination of the present tectonic stress state[J]. TECTONOPHYSICS,2009,475(2):220-225.
APA	Cui, JW ,Wang, LJ ,Li, PW ,Tang, ZM ,&Sun, DS .(2009).Wellbore breakouts of the main borehole of Chinese Continental Scientific Drilling (CCSD) and determination of the present tectonic stress state.TECTONOPHYSICS,475(2),220-225.
MLA	Cui, JW ,et al."Wellbore breakouts of the main borehole of Chinese Continental Scientific Drilling (CCSD) and determination of the present tectonic stress state".TECTONOPHYSICS 475.2(2009):220-225.