عنوان مقاله [English]
Since in production and exploration of hydrocarbon, reservoir geomechanics possesses an important role, so in this research the impact of facies, texture and diagenesis on the geomechanical behavior of the Asmari Formation are investigated. Three sets of data were used in this research; 1) sedimentological data including thin section petrography, porosity and density 2) rock mechanical data comprising uniaxial compressive strength, cohesion, friction angle, tensile strength, brittleness and drillability index, and 3) ultrasonic data including S- and P-wave velocity. These tests were done on 140 cores from outcrop and subsurface. To investigate a possible relationship between the sedimentological features and rock mechanical behaviors, a facies index was defined based on the textural and diagenetic features allowing to quantify a sedimentary microfacies. Based on facies index, porosity and UCS five different geomechanical facies were determined for the Asmari Formation, where GMF1 to GMF5 represent very ductile to very brittle behavior, respectively. The results of the study showed that mechanical behavior is controlled by the depositional and diagenetic overprints. Furthermore, by facies index the rock strength may be predicted based on petrographical observations. Such studies are helpful for reducing the costs/time for acquiring geomechanical datasets and zonation of reservoir mechanical stratigraphy.