Fractured Reservoir in Baong Formation, North Sumatra Basin, Indonesia

Abstract

Fracture reservoirs are becoming a major issue throughout the entire world both old and new fields. Many newly discovered oil and gas fields happen to be fractured and their development constitutes a real challenge for E&P industry. North Sumatra Basin (NSB) is one of Indonesia's most profilic sedimentary basins. Baong Formation in NSB is one of the main rocks in the NSB with total content of shale hydrocarbon gas of 4,450 Mmboe and for oil 2,230 Mmbo. Despite of Baong Formation as a source rock in majority of field in NSB, The AR gas reservoir are hosted by fractured  Middle Baong Sandstone (MBS) units. 

The understanding how naturally fracture can develop in MBS is interested to discuss to expand the exploration in the NSB. This study provides an integrated subsurface data (well log, seismic, drilling report, etc) from several field, outcrop data analogue, and regional literature study. Based on this study fractured MBS can caused inversion tectonic activity, regional uplift in the Middle Miocene was observed by the reactivation of older horst and grabens in NSB and widespread erosion led to regional unconformities. The fracture play in MBS led us to the new exploration view in North Sumatra Basin.