Research Of In-situ Stress In Different Geological Structure

In-situ stress plays an extremely important role in oil and gas exploration and development,which is indispensable to drilling and development.So the determination of magnitude and direction of in-situ stress is particularly important to petroleum engineering.This article summary the isotropic and transverse isotropic in-situ stress models.And according to the altitude of bed,fault structure,stratigraphic features and pore pressure,analyse the sensitivity of parameters affecting in-situ stress.At the same time,according to the failure types,analyse the stress state,and calculate the difference of in-situ stress between before and after fault movement.And numerical simulation is used to analyse the in-situ stress range before and after fault movement.Create the in-situ stress field with thin plate model,and get the in-situ stress transverse distribution.Finally analyse the in-situ stress of trike-slip fault zone,and calculate the impact on the borehole wall sTableility.Through the analysis of in-situ stress changes under different tectonic conditions,concludes that the influence law of different parameters on the in-situ stress,and analyses its influence on petroleum engineering,which has great practical significance.