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Home Studies Sumatra Basins

 Sumatra Basins

GIS-based G&G Database and Report


Continuing on from our success of over 80 completed studies across SE Asia, JMJ Petroleum has generated a GIS-based exploration database for the onshore and offshore basins of Sumatra designed to help evaluate the hydrocarbon potential and risk and uncertainty the offshore as a means of defining the exploration potential of the pre-, syn- and post-rift sections of the basins. This in-depth block evaluation has been constrained by seismic, well, gravity, geochemical, heat flow and other complimentary datasets.

The resultant GIS G&G project database and accompanying hard copy A3 report cover the following basins:

  • North Sumatra Basin
  • Central Sumatra Basin
  • South Sumatra Basin
  • Sunda and Asri Basins

The GIS G&G database contains:

  • Prospects and Leads
  • Exploration Opportunity Summaries
  • E&P Data
  • Major Fields and Discoveries
  • Key Dry Wells
  • Culture Data
  • Tectonics and Structure
  • Tectonostratigraphy for Each Basin
  • Essential Play Elements
  • Basin Modelling
  • Gross Depositional Environment Maps
  • Gravity Data, including full Interpretation
  • Landsat Data
  • Bathymetry and Elevation (SRTM) Data

A full text summary of the proven and potential plays identified in each major basin is provided in terms of their exploration potential, and risk and uncertainty. These findings are also presented in the form of a set of exploration opportunity summary montages, which are populated with seismic, well data (where available), defined prospects and leads, and other complimentary datasets.


GIS G&G Project and A3 Hard Copy Report

study sumatrabasins

GIS G&G Project and A3 Hard Copy Report.


A Petroleum Systems Evaluation of the Onshore and Offshore Sumatra Basins.

JMJ Petroleum has recently undertaken a non-exclusive study on the basins of Sumatra – 'A Petroleum Systems Evaluation of the Onshore and Offshore Basins of Sumatra– Inferences from Tectonic, Structural and Source Rock Modelling, and Base Tertiary and Palaeodepositional Mapping using GIS Technology’ – as a means of defining the exploration potential of the pre-, syn- and post-rift sections of the basins. The findings of this investigation have been used to evaluate the blocks of interest in terms of predicted hydrocarbon potential (prospectivity) and exploration risk and uncertainty through the generation of a suite of Common Risk Segment (CRS) Maps for source, reservoir and seal presence and effectiveness.

The area being evaluated includes all areas of onshore Sumatra, including North Sumatra, Central Sumatra, Ombilin and South Sumatra, and selected areas offshore, which includes the offshore extension of the North Sumatra Basin, Mergui Ridge and associated rifts, and the fore-arc basins of Sumatra.

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The GIS project contains the following thematic layers:

Hyperlinked Documents and Figures:

  • Chronostratigraphic summary charts for each major basin
  • Lithofacies summary charts for each major basin
  • Petroleum system events charts for each major basin
  • Play cartoons
  • Cross sections
  • Burial history models

Detailed Tectonics and Structure

  • Major tectonic and structural elements
  • Defined rift systems
  • Inter and intra basinal highs

Exploration Data (e.g., blocks, fields (hyperlinked layer – example field sections), prospects and leads, wells and block ranking)

Depth-to-Basement (Base Tertiary Mapping).For onshore Sumatra (including North Sumatra, Central Sumatra, Ombilin and South Sumatra), and selected areas of offshore Sumatra (e.g., offshore extension of the North Sumatra Basin, Mergui Ridge and associated rifts) we have good coverage at the basin/block scale constrained by:

  • Seismic
  • Wells that penetrate basement
  • Integrated well tops data, providing a minimum depth
  • Multiple TWT, Base Tertiary/Depth-to-Basement maps
  • Numerous georeferenced seismic sections and well correlation charts

‘Line Density Maps’have been generated through GIS using ESRI’s Spatial Analyst extension to illustrate the level of detail in terms of digitally captured data and the construction of depth contours for the main depocentres (basins) in Sumatra. The maps clearly highlight areas where there is detailed data, but also clearly show the areas where there is a lack of data control for the gridding process.

Thickness and/or Depth Mapsfor selected key intervals (source rock and reservoir), where/if the data is available.

Geochemistry(e.g., modelling points (hyperlinked layer – burial history models), top main gas expulsion, top gas expulsion/top oil expulsion, and top oil expulsion.

    • 15 burial history 1D models have been constructed during the study, optimally located in the North Sumatra (6 modelling points), Central Sumatra (3 modelling points), South Sumatra (5 modelling points) and Sunda (1 modelling point) basins. This, in addition to numerous modelling results from public domain sources, has been used, in conjunction with the Base Tertiary Map, to generate expulsion windows for oil and gas.
    • Maturation modelling summary table.
    • Heatflow map for Sumatra and Vitrinite Reflectance data.
    • Summary map of the main oil families of the Sumatra basins.
    • North Sumatra Basin
      • Summary of source facies.
      • Summary of possible oil/source correlation.
    • Central Sumatra Basin
      • Summary map of oil types.
      • Summary of main source rock characteristics.
    • South Sumatra Basin
      • Variation in geochemical signatures of oils and source rocks.
      • Source rock distribution.
    • Sunda Basin
      • Source facies summary.


Palaeodepositional (Gross Depositional Environment (GDE)) Maps for selected key intervals (source rock and reservoir) depicting lithology and environments of deposition. Of particular focus are the following:

  • Marine and largely gas-prone source rocks of the Lower to Middle Miocene Bampo, Belumai and Lower Baong Formations in the North Sumatra Basin.
  • Lacustrine source rocks of the Late Eocene to Early Oligocene Pematang Group (Brown Shales Formation) in the Central Sumatra Basin.
  • Potential organic-rich shales of the Sawahtambang Formation in the Ombilin Basin.
  • Potential Oligocene-Early Miocene deltaic coals and carbonaceous shales of the Talang Akar Formation, with minor potential from the Lahat (lacustrine shales, thin coals and fluvial deposits), Gumai (marine shales) and Muara Enim (deltaic coals and carbonaceous claystones) Formations in the South Sumatra Basin.
  • Lower Miocene Peutu/Belumai carbonates and clastics, and Middle Miocene to Pliocene sandstone reservoirs of the Baong through to Seurula Formations in the North Sumatra Basin.
  • Fluvial and shallow marine sandstones (Menggala, Bekasap, Lower Sihapas Formations), deltaic sandstones (Duri Formation) and offshore bar sandstones (Upper Sihapas Formation) of the Sihapas Group; fluvial sandstones and turbidite and fan sandstones of the Lower and Upper Red Beds Formations in the Pematang Grabens; and fractured basement in the Central Sumatra Basin.
  • Braided, fluvial sandstones of the Oligocene Sawahtambang Formation in the Ombilin Basin.
  • Fluvial channel, point bar and beach sand deposits of the Talang Akar Formation, and carbonate bank and reefal buildups of the Batu Raja Formation in the South Sumatra Basin.

Play Fairway Mapping. For each play defined through analysing the petroleum systems of each basin, Gross Depositional Environment (GDE) maps have been generated for the key source facies, reservoir and seal intervals, and have been used to create component risk maps of their extent, quality and effectiveness. Once complete, the resultant GIS mapped layers have been combined to form Common Risk Segment (CRS) maps for the basin, which define the relative probability for accumulation, based on the quality and quantity of the data available.

In conjunction, burial history modelling of selected wells and pseudowells (from in-house and public domain sources) have allowed for the identification and definition of active source kitchens, and the generation of hydrocarbon expulsion windows and limits of lateral migration (Hydrocarbon Charge maps).

Combining all these mapped elements through GIS has allowed for the generation of a composite map of essential play elements that than can be used to define a particular Play in terms of its extent and quality; with the capability to generate a suite of Play Fairway maps, for both proven and potential reservoir intervals, by overlying proven and potential reservoir and seal intervals on top of the mapped extent of hydrocarbon charge. The play fairway defined where all three, reservoir, seal and hydrocarbon charge, favourably combine.

Qualitative assessment of the defined play fairway will be made on the basis of importing additional data and information, such as fields in play, field trapping styles, and the distribution of prospects and leads, resulting in the identification of key areas of possible hydrocarbon potential at the block and prospect scale.

On a Quantitative basis, the mapped GIS layers can be combined mathematically based on risk values and yields to create a composite map of play risk, which can be used in the assessment of the yet-to-find (YTF) potential in these plays

Gravity-based Interpretation (e.g., regional faults, faults/fractures, lineaments depocentres, volcanics and granites)

Gravity Data (e.g., Free Air, Bouguer, Isostatic, Isostatic First Vertical Derivative, Isostatic Band Pass, Isostatic Total Horizontal Derivative, Isostatic Horizontal Derivative X Direction, Isostatic Horizontal Derivative Y Direction, Isostatic Tilt Derivative and DEM)

SRTM Data (onshore elevation data)

Bathymetric Data

The A3 full colour hard copy report contains the following chapters:

  • Executive Summary and Conclusions
  • Tectonostratigraphic Framework
  • North Sumatra Basin and Mergui Ridge System
  • Central Sumatra Basin
  • South Sumatra Basin
  • Sunda/Asri Basin
  • Sumatra Fore-arc Basins
  • Potential Field Interpretation and Modelling
  • Source Rock Geochemistry
  • Exploration Risks and Key Issues
  • Appendix – Source Rock Geochemistry

All mapped interpretational elements and underlying datasets are contained within the GIS project. The A3 hard copy report contains over 150 colour pages.