Play System from the Last Decade Discoveries in Indonesia Basins*
Brahmantyo K. Gunawan, Sunjaya E. Saputra, M. Kusuma Utama, Cipi Armandita, and Johnson A. Paju
Search and Discovery Article #10153 (2008)
Posted August 21, 2008
*Adapted from oral presentation AAPG Convention, San Antonio, TX, April 20-23, 2008.
Exploration Division of Planning Department, Executive Agency for Upstream Oil & Gas Business Activities Republic of Indonesia ([email protected])
In the past 10 years of hydrocarbon exploration history in Indonesia, there are several significant hydrocarbon discoveries. Generally, the play concept has moved to the deeper target and older reservoir. Several new play concepts for the Eastern Indonesia area are thin-skinned thrust system in the turbidites in the Kalimantan deepwater, Miocene reef play in the Sulawesi area, and Jurassic sand in Papua and East Timor gap. In East Java basin there are two explorations targets that have been pursued for the last 10 years; they are Oligo-Miocene reef and volcaniclastic Pliocene sediments. Meanwhile in the Sumatra area the target has changed into the deeper target, which is Oligo-Miocene syn-rift sediments.
The successful discoveries have resulted in other companies learning from them and increasing their exploration activities in the past five years by developing new concepts in their blocks or acquiring new blocks in nearby areas. (Mahakam deep water block discovery has been resulted in other discoveries in the surrounding area, including in Tarakan deepwater area.)
The new play exploration strategy, by defining the new play concept from lessons learned from relatively recent discoveries, has become the current model in the exploration activities. Therefore, understanding the play concept in new discoveries will immediately upgrade the opportunity to find hydrocarbons.
1. Dutch Government (1865 – 1940)
Exploration by Dutch Government started in 1865 and first exploration well drilled 1872
2. After Indonesian Independence (until early 1970)
Commercial working area operated by several companies
3. Early 1970
Start of applied subsurface 2D seismic technology
4. 1980 – 1990
Fluctuation in HC Production (lowest in mid-1980 and gradually increased until 1990)
5. 1990 – now
Old fields started to deplete
In general, the exploration targets in Indonesia before 1990 are situated in Western Area and, mostly, discovery in Neogene Back-Arc Basin and Passive Margin Deltaic Setting, called “Indonesian Conventional (classic) Play Types,” including:
Thus, Indonesian “Unconventional Play Types” are play types besides the conventional types, as mentioned above.
Oil production from mature fields is declining.
Nilandro and Baraclough, 2003, Principal Tectonic Elements Map of Eastern Indonesia.
Satyana, A.H., 2007, Central Java, Indonesia, a “terra incognita” in petroleum exploration; new considerations on the tectonic evolution and petroleum implications: Thirty-First Annual Convention and Exhibition Proceedings, Indonesian Petroleum Association, p. 105-126.
Deputy of Planning BPMIGASL: Mr. Achmad Lutfi; Head of Exploration