Application of Constraint Analysis Method to Establishing In-Situ Stress Model

Abstract

Abstract: The accurate establishment of in-situ stress model is an important basis for oil and gas exploration and development. The constraint analysis method is used to establish in-situ stress model, whose essence is to analyze the constraint boundaries of vertical principal stress, the max. horizontal principal stress and the min. horizontal principal stress, narrow the computing boundaries and improve computing accuracy. On the basis of the fault pattern theory proposed by E. M. Anderson, 4 types of in-situ stress boundaries and the corresponding constraint equations are obtained. The frictional strength on the original fault surface determines the upper limit of stress differences between the max. and min. horizontal principal stress; formation pore pressure can give the lower limit of the min. horizontal principal stress; the width of borehole breakout or drilling-induced fractures can be used to determine the upper limit of the max. horizontal principal stress; the min. horizontal principal stress can be measured by hydraulic fracturing tests and the max. horizontal principal stress can be estimated as well; the vertical principal stress can be gained through density logging curve integral. The actual application shows that the constraint analysis method is an effective way to establish in-situ stress model and to determine the 3 principal stresses (especially the max. horizontal principal stress) combined with the results from laboratory stress experiments.

Key words: in-situ stress model, constraint analysis method, constraint boundary, principal stress

YANG Minghe, ZHANG Yang, YANG Hu, WEN Qianbin, SHI Jiangang, CHEN Weifeng. Application of Constraint Analysis Method to Establishing In-Situ Stress Model[J]. Xinjiang Petroleum Geology, 2016, 37(zk(English) ): 110-114.

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