Resistivity and Acoustic Image Analysis of the Main Borehole (CCSD-MH), Eastern China
Resistivity and acoustic imaging is one of the most successful tool used in the Main Hole of Chinese Continental Scientific Drilling (CCSD-MH) Project, which is located in Maobei Village, Donghai County, Jiansu Province, eastern China, The upper 900 m is subjected to more than one tectonic phase, caused by compression stresses of SE-NW, and NE-SW directions. This upper part is characterized by fractures which are vertical and highly dipping, mainly 40°-70°, expected to be mylonites of fault zones, in addition to conductive shear zones. Those zones play an important role in weathering of rocks mainly during UK intersection of E, SE and S dipping fractures. Mineral alteration in mafic rocks is so distinctive especially at the boundaries with other rocks. Paragneiss shows clear foliation and regularly-spaced jointings. The orientation of the present days stress is NE-SW, deduced from drilling-induced fractures. The maximum principal horizontal stress direction is NE-SW known from breakouts in the lower depths. The rocks at lower depths are dense, slightly weathered and with closed fracturing.
Chinese Continental Scientific Drilling Project borehole logging resistivity imaging,acoustic imaging fractures mylonites of faults shearing.
Ahmed M A Salim Pan Heping Luo Miao
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
国际会议
The IPACES 6th Annual Meeting(“现代地球科学，交流与合作国际学术研讨会暨第六届IPACES学术年会)
武汉
英文
10-12
2007-04-25（万方平台首次上网日期，不代表论文的发表时间）