In recent years, rock mechanic gained great interests in petroleum industry. Geomechanical<br>properties of reservoir rocks have an important role on designing of drilling, stability of well bore<br>and planning for production. Rock mechanical properties usually calculate based on direct<br>laboratory tests on cores or using sonic logs. The study of cores is not always possible or even<br>feasible. Cores of limited parts of drilled section are normally available. Coring is expensive and<br>destructive geotechnical test on cores, which are valuable documents, is normally prohibited. This<br>paper presents a new method for indirect measurement and estimation of the rock geomechanical<br>properties, using sonic logs and porosity data. Based on the study of data from three wells, drilled in<br>different formations of three oil fields, in southern Iran, some relations with good correlation<br>coefficients, have been developed. Derived relations can be used to present a continuous picture of<br>the mechanical behaviors of the drilled section.<br>Key words: Oil and gas wells, Geomechanical properties, Porosity, Sonic logs, Iran


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