FAULT FRICTIONAL STRENGTH BASED MODEL FOR IN-SITU STRESS CALCULATION

The in-situ stress near the shallow faults is an important factor affecting underground chamber engineering and or oil exploration and development. Due to the tectonic movements, the shallow fault rocks are in weak cemented state. The conventional methods for measuring in-situ stress exist the deficiencies such as larger error, higher cost, longer cycle and so on. Based on the Mohr-Coulomb strength theory, this paper systematically analyzes the relationship of the in-situ stress near faults, the fault friction coefficient calculation and fault frictional strength. Finally, the in-situ stress model is applied to calculate the stress of Chengzhuang region. The results coincide with the measured results. The results have important implications for stress calculation, and efficient product of oil and gas.