In-situ stress determination from borehole and logging analysis
Speaker: Chia-yu Sung Adviser: Jih-hao Hung
Abstract
Obtaining quantitative information on the state of stress in the crust can only be accomplished by accessing the zone of interest by drilling and logging. There are currently a number of different borehole methodologies and logging analysis available to research the in situ stress .The magnitude of the minimum horizontal stress (Shmin) can be estimated from hydraulic fracturing tests. The magnitude of the vertical stress (Sv) is obtained by integration of rock bulk densities of overlying mass taken from density logs. The maximum horizontal stress (SHmax) can be estimated from a calculation of Anderson’s frictional limits theory or modeling wellbore failures. The pore pressure can using sonic log inverted by the empirical method of Eaton. The stress orientation is determined by caliper log and image log from borehole failure. However, the complete state of in situ stress cannot be determined by single method. As such, current practices focus on obtaining as much stress information from more kind of measurement technique.
Reference
Douglas R. Schmitt , Claire A. Currie, Lei Zhang, 2012. Crustal stress determination from boreholes and rock cores: Fundamental principles, Tectonophysics
Jih-hao Hung , Jong-chang Wu, 2012. In-situ stress and fault reactivation associated with LNG injection in the Tiechanshan gas field, fold-thrust belt of Western Taiwan, Journal of Petroleum Science and Engineering
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J. Reinecker, M. Tingay and B. Müller, 2003. Borehole breakout analysis from four-arm caliper logs, World Stress Map Project