52873_stratigraphic trap aapg presentation

8/10/2019 52873_Stratigraphic Trap AAPG Presentation

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InfralineEnerg

STRATIGRAPHIC TRAP SYSTEM


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g

--2-- Stratigraphic Trap

Petroleum System Components

Source RockSource of hydrocarbonrich of

organic materials

Reservoir Rockplace of hydrocarbon to migrates

and accumulatedporous and permeable Seal RockFluid Insulatorimpermeable

Trapprevent hydrocarbon escape due to migration


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Types of Petroleum Trap

Structural Trap

Stratigraphic Trap

Hydrodynamics Trap Combination Trap

Stratigraphic Trap--3--


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Stratigraphic Traps

The term stratigraphy basically means the

study of rocks strata and their variations.

Stratigraphic traps occurs when the

hydrocarbon accumulated due to the change

of rock characteristic rather than faulting or

folding.



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TYPES OF STRATIGRAPHIC

TRAP :

Pinch out trap

Unconformity trap

Reef trap



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Pinch Outs

In a typical coastal plain, the sediments are deposited with a

slight dip down into the basin (ocean).

A sandstone pinch-out or wedge in a shale layer will trap any

petroleum rising up the dip of the sandstone in a landward

direction

An up-dip plug may block the upward flow of petroleum in an

otherwise excellent reservoir rock. The plug is formed when

impermeable muds are deposited in channels cut through a

lower reservoir layer, forming a barrier or dam.


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Unconformity Trap

An unconformity is a break in the depositional sequence of

rocks.

If the underlying beds were tilted, eroded, and then covered

with flat-lying impermeable rocks, then oil and gas may be

trapped at the unconformity.

The reservoir may be capped by almost any fine grained

sedimentary rock type, but commonly by shale or evaporates


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Oil and gas


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Reef

Reef have vital characteristics to be petroleum trap:

They have great porosity excellent reservoir

They are commonly very well sealed.

As the reef is buried in the subsurface and a greater thickness

of loose sediments is deposited on the sides and on the top of

the reefSediment Compacted

More compaction occurs in the thicker sediments along the

flank of the reef, a broad anticline forms in the sediments over

the reef Reeftrap formed


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Environment

Fluvial Environment

Stratigraphic Trap--13--Braided Stream

Meandering Stream


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Environment

Fluvial Environment (Meandering Stream)



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Environment

Transitional Environment



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Environment

Coastal Reef Environment



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Reserve and Potentials in Indonesia

Proven Reserve

Peciko Field, Mahakam Delta

Widuri Field, SE Sumatera Basin

Belida Field, West Natuna Basin

Kurau Field, Malacca Strait

Kasim Jaya Field, Salawati Basin, Papua

Potential Field

Ancient Bengawan Solo Channel

Bengawan Solo Delta


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Mahakam

Delta

3 D-Seismic Model ofFluvial Meandering,Natuna


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Bengawan

Solo Delta

Ancient Bengawan

Solo Channel


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Challenge

Commonly, stratigraphic trap have indistinct

border than structural trap on seismic

profileNeed a special expertise to identify

Need a special technique and higher

technology to exploreHigher Cost

Economic Value due to capacity constrains

Some stratigraphic trap have a smaller

localities than structural trap


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References

Allen, et all. 2006. The Deliberate Search for the

Stratigraphic Trap. London: The Geological Society

Special Publication

Plummer, Mc Geary, Carlson. 1999. Physical Geology.New York: McGraw-Hill Companies

Koesoemadinata, RM. 1987. Geologi Minyak dan Gas

Bumi. Bandung: Penerbit ITB

https://www.slb.com/~/media/Files/resources/oilfiel

d_review/ors97/win97/traps.pdf

http://pages.geo.wvu.edu/~jtoro/petroleum/17_stra

t traps.pdf
https://www.slb.com/~/media/Files/resources/oilfield_review/ors97/win97/traps.pdfhttps://www.slb.com/~/media/Files/resources/oilfield_review/ors97/win97/traps.pdfhttp://pages.geo.wvu.edu/~jtoro/petroleum/17_strat_traps.pdfhttp://pages.geo.wvu.edu/~jtoro/petroleum/17_strat_traps.pdfhttp://pages.geo.wvu.edu/~jtoro/petroleum/17_strat_traps.pdfhttp://pages.geo.wvu.edu/~jtoro/petroleum/17_strat_traps.pdfhttps://www.slb.com/~/media/Files/resources/oilfield_review/ors97/win97/traps.pdfhttps://www.slb.com/~/media/Files/resources/oilfield_review/ors97/win97/traps.pdf

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