BASIN PLAY BASIN PLAY Applied in Deep Water Oil ExplorationApplied in Deep Water Oil Exploration

Compared with Backscatter Seabed Compared with Backscatter Seabed at Makassar Strait - Indonesiaat Makassar Strait - Indonesia

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Makassar Makassar StraitStrait

Celebes Sea

Java Sea

Makassar Strait

KUTAI BASIN

Makassar Strait primary constructed by Kutei Basin, also called Kutai Basin, is the largest and deepest basin in Indonesia and estimated as the biggest hydrocarbon in Indonesia

Greater Tarakan

About 17% of PSC occupy in Makassar Strait is commercial area for oil and gas exploration.

Pater Noster

Study Study AreaArea

Makassar Strait separate Kalimantan (Borneo) island and Sulawesi (Celebes) island 200 km wide, the water depth vary between 0 - 2,500 m which the deepest area lies on northern part of the strait.

Niko has 3 PSC in Study Area, 2 operated block: South East Ganal I PSC & North Makassar Strait PSC; and 1 non operated block: North Ganal PSC

Fields and Well

Field•There are 113 fields in Kutei Basin•31 fields in status Producing•39 on phase Discovery•13 in Developing level

Well•There are more than 6,000 well in Kutei Basin•Half of it drilled offshore•Only 220 of them lies at deep water zone.

Definition of deep water well is the process of drilling took more than 500 meter of water depth. The deep water well at Kutei Basin varies between 500 – 2,800 meter of water depth.

Deep waterDeep waterShalowShalow

Kutei Basin is surrounding by Gas and Oil Field which based on USGS assessment minimum undiscovered field size in this basin would be 1 million MMBO and 6 million MMSCFG (estimated at 2000).

Gas Recovery

million mmscfg

Oil

Reco

very

(mill

ion

mm

bo)

Basin Analysis

# Statistical calculation, merely using attribute table data and commonly use to examine value distribution and summarize data.

The grap show Gendalo has biggest oil recovery than other three field whereas Gehem has biggest gas recovery.

Net Pay is volumetric estimation of hydrocarbon Resources. Net reserve are estimated remaining quantities of oil and natural gas and related substances anticipated to be recoverable from known accumulations.

# Well Log of Net Reserve and Net Pay able to execute area pattern overview.

Well Log

GIS Database

Grid interpolation represents a prediction from several sample location for regional overview, where completeness values force high assumption that will bring different result which may be incorrect.

Interpolation model that calculated Net Reserve and Net Pay in order to provide surface gridding that has taken from well logging both Pre and Post drill report.

Grid Interpolation

Net Pay

Well : 9 locationResolution: 500 mMethod : Kriging Universal type (linear with Quadratic drift)No Barrier

Area Study cover in high Net Pay value (251 – 300)

Kriging assumes that the distance or direction between sample points reflects a spatial correlation that can be used to explain variation in the surface.

Barrier and No Barrier (Net Reserve)

Net Reserve Interpolation No Barrier

Net Reserve Interpolation With Barrier (Structural Fault)

Interpolation with barrier only available in Spline scheme.

Well : 10 locationResolution: 500 m

Hydrology Analysis

Bathymetry Flow Direction

Flow Accumulation

One of the keys to deriving hydrologic characteristics about a surface is the ability to determine the direction of flow from every cell in the raster which called Flow Direction. The Flow Accumulation calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster. The output from Flow Direction will determine the connectivity of the flow direction in order to produce a flow accumulation dataset.

Structural Closure

Streamlink and Watersheds

Sink and Fill

Structural Closure

The workflow extended to map fetch and accumulation areas to identify structural topography ponding areas. GIS term is calculate sink where a cell that does not have a defined drainage value associated with it and Fill it which is used to remove any imperfections (sinks) in the digital elevation model. Measurements of both the areal closure and the distance from the apex to the lowest closing contour are typically incorporated in calculations of the estimated hydrocarbon content of a trap.

Prospect Area

Prospect area(hydrology analysis)

The closure must be considered as a barrier to the migration hydrocarbon in other words the passage from a porous and permeable facies to a fine-grained sediment exhibiting an injection pressure which is greater than the outward thrust exerted by the fluids. Thus the closure has obligatory to compare to the hardness of seabed rock composite.

Backscatter deStripe

Backscatter can be used to determine bottom type, because different bottom types “scatter” sound energy differently. For example, a softer bottom such as mud will return a weaker signal than a harder bottom, like rock. The aim is to use this information for obtaining sediment properties (e.g., grain size) by analyzing the backscattered response. The simple word in describe Backscatter data is: Higher the value means harder the rock composite.

Prospect Area Prospect Area (backscatter)(backscatter)

Most Prospect area(overlay hydrology analysis & backscatter)

Drop Core Sample

Coring Location(as additional information for further analysis)

Planned Coring Location(Sample base on difference between Net Pay - Net Reserve with backscatter - structural closure area)

Planned Coring Location(Sample base on difference between backscatter and structural closure)

Planned Coring Location(Sample in order to have better data distribution)

THANK YOUTHANK YOU

Writer:Writer:Irvinia ArumsariIrvinia Arumsari

iyenk@nikoresources.com+628159407354+628159407354

Asia Geospatial Forum Asia Geospatial Forum Regional Response to Global Challenges and OpportunitiesRegional Response to Global Challenges and Opportunities

Kuala Lumpur – Malaysia, September 2013Kuala Lumpur – Malaysia, September 2013