Unification of Geological Phenomena Associated with Geohazards in the Persian Gulf - A Case Study Using 2D Seismic Data

This study has been made due to the problems aroused from a challenging gasfield drilled by two wells, one nearly prone to eruption. A pronounced gas chimney located in the north of the Persian Gulf has motivated this study orienting toward a new approach in geohazards study. The prime task was to investigate geological features liable to hazards while drilling, specifically gas chimney aimed at pursuing its evolution and its interaction with faults. The interpretation was initiated by making use of 2D marine seismic data resulted mapping a number of key horizons, followed by fault interpretation, gas chimney prediction and seismic attribute study. In the present paper, an ample attention was paid to investigate a geodynamic mechanism manifested by characters such as so called A, V, U shapes, Micro-deformed zones and buckle folds, leading eventually to certain geological features, notably geohazards. Observations led to contemplate of different encountered geohazards, would have been originated by a unique processes. Hence, the subsequent features have been termed as the unified geological forms. We classified and mapped the hazardous geological features (geohazards) on each key horizon to be considered as a basis for ulterior drilling forecast.