Application of Fullbore FormationMicro Imager in recognition of the sedimentary facies, features and diagenetic processes Dalan Formation in south of Iran

Primary sedimentary and secondary structural and diagenetic processes are responsible for heterogeneity in carbonate reservoirs and recognition of these factors is very essential subject in modeling these reservoirs. Image logs are very useful for identification of structures and small scale sedimentary features. In this research، using image analysis of Formation Microimager log (FMI) in a drilled well in Dalan Formation، 7 patterns including: 1- band pattern، 2- spot pattern، 3- fracture pattern، 4- drilling induced fracture، 5- cross bedding pattern، 6- block pattern and 7- stylolite pattern are proposed. These patterns were compared with thin sections and core samples. Finally، with combining the FMI results، analyzed by JmicroVision (v. 1. 27) software، with thin sections and core samples of the different facies used to separate the grain supported from mud supported facies. Also among the various diagenetic processes، pressure solution، nodular anhydrite، bioturbation and dissolution were identified in image logs. This study shows that in most cases there is a good synchrony between the results of image logs، thin sections، core samples and well logs.