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Damage Zone Characterization of Kizilin Fault and Its Relationship with Crossing and Converging Neighboring Faults

Abstract

Kizilin Fault is a ESE trending right-lateral strike-slip fault, located at ∼30 km to the SW from Adiyaman, SE Turkey. It had previously been observed either in field studies including narrow scale geological mapping around the village of Kizilin, from where it was named, or in 2D seismic sections belonging to Turkish Petroleum Corporation in a few km broader extent. However, neither its morphology nor its influences on the regional tectonics have been adequately studied yet. We carried out detailed geological mapping in the region to introduce a structural model, and elaborated the maps by locating subsidiary fault and fracture data collected from the damage zones of the Kizilin Fault and some interacting regional faults, such as left-lateral Adiyaman and Kemerli Faults, and right-lateral Bozova Fault. In this study, we aimed to reveal Kizilin Fault's length, damage zone properties, relative age and its contribution to fractured reservoir analogues in the region. We discovered that the Kizilin Fault can be traced from Sariyaprak Village located at ∼15 km to the SW of Besni County to Bozova County. Accordingly; its traceable length is ∼75 km. We revealed that the Kizilin faults cut and shifted NE trending Adiyaman and Kemerli Faults. Nevertheless, though the Kizilin and Bozova fault zones lies to the SE by converging to each other, no offsett formed by Kizilin Fault could be observed in Bozova F. along its length. Lineaments of these faults align almost parallel around the southern coast of Ataturk Dam's lake, where their damage zones largely overlap. Since the Bozova F. is older than the Kizilin F., and their damage zones are overlapped, we consider that the Kizilin F. might have used and reactivated pre-existing step-over subsidiary faults of the Bozova fault damage zone. The existence of multiple joint sets and their cross-cutting relationships may indicate different timing of activation phases and confirm the overlap of two damage zones. Based on observations of oil seeps in the apertures of transmitting joints in the outcrops which are not underlained by thick impermeable units, we infer that coexistence of these faulting phases can contribute to connectivity and porosity of the buried fractured reservoir analogues in the region, as long as they are overlained by considerably thick impermeable units.