Strike-Slip Fault System Characterization and Its Implication to Hydrocarbon Entrapment in the Puja High, South Sumatra

Exploration well Puja-1 was drilled by PT Pertamina EP in 2009 and discovered gas with condensate. Geologically Puja area is a local high in the Tempino-Kenali Asam Deep and located in the Jambi Sub basin, South Sumatra Basin, Indonesia. Objective of the study is to investigate the structural geology in the Tempino-Kenali Asam deep and Puja local geological high. Fault and stratigraphy horizon from 3D seismic data and Puja-1 well were interpreted and modeled to recognize the 3D structural geometry in the Puja high. Variance seismic attributes analysis in the Puja 3D seismic is done in various time levels to recognize fault boundary and structural style in the Puja Area which has been developed.

Detail structural geology analysis show the normal fault development which act as main border fault (F1) in the southern Puja area dipping to the Southeast-East and main border fault (F2) in northern Puja area dipping to the Northwest-West. Those faults related to the transtensional system which developed as a rift system in the Puja area. Structural pattern related to the half graben and accommodation zones affected the syn-rift clastic sedimentation and subsequently hydrocarbon entrapment in relation to petroleum system in the Puja Area.