Semai Area is located in southern part of Bird’s Head, Irian Jaya, Indonesia (Figure 1), formed by interaction of three major plates, which are the Australian, Pacific, and Eurasian Plates. Some compressional events had occurred during Oligocene until Miocene and endedby Misool-Onin-Kumawa Ridge uplift in the Middle Pliocene. Exploration activities that ever been conducted in West Papua are Geological and Geophysical Surveys and Exploration-Production Well Drillingin the northern/onshore part (Bintuni Basin), meanwhile the southern/offshore part (Semai Area) is relatively unexplored.

First exploration activity in Offshore Semai Area was one exploratory well drilled in northern part of Offshore Semai Area in the mid 1970with Miocene Carbonates (Kais Formation) as the main objective. Unfortunately the result were not as expected, they did not find any economical reserve, only a minor oil fluorescence was encountered in several thin sandstone intervals.

The development of petroleum system concept in the northern area which have found giant gas fields such as Wiriagar and Vorwata Fields in Bintuni Basin from1981 until 1997 has triggered new exploration era in the southern part of Papua Barat (Offshore Semai Area). The Indonesian Government with Fugro had conducted a speculative 2D seismic survey which cover most of all deep water Offshore Semai Area from 2005 to 2008. The survey identified several huge structures with a potential to contain significant hydrocarbon in some stratigraphy levels. Based on that result, Indonesia Government created five exploration working areas in Offhore Semai Area.

The result of the speculative survey attracted national and international oil companies to sign on four of five offered PSC. Then 2D and 3D seismic were acquired in almost entire offshore area, and generate three regional exploration plays in the area. Exploration drilling had been started from 2010 until 2012 resulting seven wells drilled in the area. Unfortunately the results were not good enough to conduct further exploration studies. All of those well are categorized as a dry-hole-well.

Unsuccessful of those drilling affected exploration activities in the Offshore Semai Area. This is marked by no more new working area signed in Offshore Semai Area from 2012 to 2015. This paper is to demonstrate the exploration opportunities and challenges in an effort to discover hydrocarbons in the Offshore Semai Area.

Presentation Date: Thursday, October 20, 2016

Start Time: 10:35:00 AM

Location: 143/149

Presentation Type: ORAL

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