Datapages, Inc.Print this page

Click to view presentation in PDF format.

 

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])

 

Abstract

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.

 

 

 

uAbstract

uFigures

uExploration history

uPlay types

uUnconventional types

uReferences

uAcknowledgements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

uAbstract

uFigures

uExploration history

uPlay types

uUnconventional types

uReferences

uAcknowledgements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

uAbstract

uFigures

uExploration history

uPlay types

uUnconventional types

uReferences

uAcknowledgements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

uAbstract

uFigures

uExploration history

uPlay types

uUnconventional types

uReferences

uAcknowledgements

 

Indonesian Exploration History Periods

1. Dutch Government (1865 – 1940)

Exploration by Dutch Government started in 1865 and first exploration well drilled 1872
First oil field discovery (Telaga Said, North Sumatra) 1885
Exploration target defined by outcrop mapping and shallow drilling technology

2. After Indonesian Independence (until early 1970)

Commercial working area operated by several companies
Discovery Duri, Talang Akar, Minas Field using simple exploration methods with increase in the production, lifting up to 1,000,000 BPOD

3. Early 1970

Start of applied subsurface 2D seismic technology
Production lifting increased up to 1,600,000 BOPD

4. 1980 – 1990

Fluctuation in HC Production (lowest in mid-1980 and gradually increased until 1990)
2D and deep target drilling applied
Mostly, productive fields located in back-arc and deltaic passive margin setting

5. 1990 – now

Old fields started to deplete
2D / 3D and drilling technology improvement
Triggering search for other targets (unconventional)

Play Types

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:

  • Classic Shallow Target
  • Classic Clastics
  • Classic Carbonates
  • Classic Stratigraphic and Combination

    • Thus, Indonesian “Unconventional Play Types” are play types besides the conventional types, as mentioned above.
    The successful unconventional plays, explored from 1990, are in:

  • Deep Oligo-Miocene ~ Rift Phase Clastics
  • Deep Oligo-Miocene ~ Carbonate
  • Deep water clastics (Pro-Delta)
  • Volcaniclastics
  • Pre-Tertiary & Basement
  • Collision Tectonic Setting Complex

    • Why “Unconventional Type”?

    Oil production from mature fields is declining.
    Addition of new reserve from conventional (classic) play type is minor. No significant replacement of reserves that are being reduced by HC production.
    “Unconventional play type” discoveries give larger new HC reserves; they are ready to develop.
    Collision/Australian Continental Margin--Pre-Tertiary, which contributed most of HC reserves in last decade, need more exploration efforts.
    Some frontier basins that have “unconventional play types” may trap “big fish” (high risk, high reward, as opposed to low risk, low reward).

    References

    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.

    Acknowledgements

    Deputy of Planning BPMIGASL: Mr. Achmad Lutfi; Head of Exploration
    Division:BPMIGAS: Mr. Bob Yulian; Heads of Exploration Region I, II and III
    BPMIGAS: Mrs. Nugrahani, Mr. Indro Purwaman, and Mr. Djumlati; Mr. Awang Harun Satyana and Mr. Elan Biantoro for Technical Contribution; Total E&P Indonesie; PetroChina International.

     

    Return to top.