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Aamir et al. 25

ABSTRACT

Two dimensional seismic interpretations have beencarried out in the Central Indus Basin, Qadirpur area toconirm the reservoir characteristics o the producin!Sui "ain #imestone and Rani$ot %ormation and todelineate promisin! locations or test drillin! into theSui "ain #imestone and Rani$ot %ormation.Interpretive results o time contour map indicate thatmost o the prospect &ones o 5 to '( milliseconds arein the southwest direction at Sui "ain #imestone level

and '( to 2( milliseconds in the north and southwestdirection at Rani$ot level. Results also revealed thatprospect &ones tend to become thin in the northeast,while it becomes thic$ in the southwest. The aboveindin!s o this stud) narrate that subse*uent chan!esin thic$nesses ma) be attributed due to the presenceo "ari+and$ot -i!h in the north o stud) area.#itholo!), water saturation and h)drocarbon saturationindicate two productive &ones within Sui "ain#imestone. Avera!e value o porosit) or eachproductive &one ran!es rom 2( to 2/, water saturation rom '0 to 2(/, and h)drocarbon saturationrom 10 to 02/. The total reservoir roc$ volume iscalculated to be 003 acres. The total volumetricrecoverable !as reserves are 3.3 Trillion Cubic %eet4TC%.

I6TR789CTI76

Qadirpur Block (Sind Province) is the concession areaoperated by OGDCL. he location o! the study area that!alls "ithin this block in Central #ndus Basin is bounded bySar$odha hi$h in the north% #ndian Shield in the east%&ar$inal 'one o! #ndian Plate in the "est% and Sukkar i!tin the south (i$ure *). he basin is separated !ro& +pper #ndus Basin by Sar$odha ,i$h and Pe'u +pli!t in the north(-a'&i and an% *//0).

 1rea !alls "ithin the latitude o! 203 445 to 263 7/5 8 andlon$itude 9/3 **5 to 9/3 :*5 ; and it is appro

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23 Structural Interpretation o Seismic isclosures in tyin$ re!lectionsaround loops Diver$ence in dip not related to strati$raphyDi!!raction patterns% particularly those "ith vertices% "hichline up in a &anner consistent "ith local !aultin$ Distortionor disappearance o! re!lections belo" suspected !ault lines(Badley% */64).

#n strati$raphic interpretation lateral continuity and

variation in sedi&entary deposits and di!!erent episodes o! sedi&entation e!!ected by tectonic activity and reco$nitiono! ti&e depositional units separated by uncon!or&ities isstudied. #n seis&ic data% erosional uncon!or&ities arereco$ni'ed on the basis o! truncation belo" and base lapabove the uncon!or&ity (Dobrin and Savit */66).

R:S9#TS

he seis&ic lines have been interpreted "hich resulted inthe construction o! ti&e contour% depth contour &aps andti&e section.

ro& correlative study o! all seis&ic lines "ith ti&econtour and depth contour &aps% !ollo"in$ results o! structural interpretation are deduced

8o de!inite !ault trend is present but locali'ed nor&al!aults do eap sho"in$ the location o! the area o! interest (1!ter Bender and a'a% *//4).

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Aamir et al. 21

 1bove Pirkoh Li&estone the behavior o! di!!erentlitholo$ies is unclear% "hich probably indicates theeain Li&estone su$$est the possibilityo! !our prospect 'ones encountered at variable depths asdiscussed.

ollo"in$ 'ones have been established and cate$ori'edon the basis o! litholo$y and values o! "ater andhydrocarbon saturation obtained !ro& the lo$ analysis o! QadirpurA7* and QadirpurA74.

?one I@ 8epth ran!es rom '('to '(3m

#n this 'one hydrocarbon ($as sho"s) are seen% so it is a$asAbearin$ 'one and it is our !irst 'one o! interest.

?one II@ 8epth ran!es rom '' to ''1m

#n this 'one hydrocarbon ($as sho"s) are seen% hence itis a $asAbearin$ 'one o! @ & thickness and it is re!erred tosecond 'one o! interest.

?one III@ 8epth ran!es rom '5 to'( m

#n this 'one hydrocarbon ($as sho"s) are seen% hence itis a $asAbearin$ 'one o! 4 & thickness and it is re!erred tothird 'one o! interest.

i$ure 2A >ap sho"in$ the location o! 2D seis&ic lines and "ell locations o! Qadirpur area.

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20 Structural Interpretation o Seismic

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Aamir et al. 2

On the basis o! calculation !or each 'one o! Sui >ainLi&estone (i$ure /) the avera$e porosity is !ound to be 27to :7J. his indicates that li&estone has hi$h !ractureporosity.

CA#C9#ATI76 7% A:RA=: ;AT:R SAT9RATI76

Nater saturation is an i&portant !actor in the =uality o! eservoir. Generally i! the "ater saturation is $reater than:7J then it "ill not be a productive !or&ation. he avera$e"ater saturation is calculated by !ollo"in$ !or&ula

S" (Nater Saturation) K (n.S") n

;valuation o! "ater saturation o! each 'one o! Sui >ainLi&estone (i$ure ** E *2)% S" appears to be *6 to 22J.

CA#C9#ATI76 %7R ->8R7CARB76 SAT9RATI76A68 T-IC6:SS

,ydrocarbon saturation is calculated by !ollo"in$e=uation

otal !luid K ,ydrocarbon Nater S, S" K *S, K * A S"

;valuation o! hydrocarbon saturation o! each 'one o! Sui>ain Li&estone (i$ure *: E *@)% S, appears to be 06 to62J.

,ydrocarbon thickness is de!ined as he product o! porosity (Hav)% net pay thickness (h)% and hydrocarbonsaturation (S,) .

,ydrocarbon thickness K avGhG 4' + S-

6:T T-IC6:SS 4h

8et pay thickness is de!ined as he thickness o! thereservoir "hich can produce co&&ercial =uantities o! hydrocarbon

otal thickness o! the reservoir 'oneK*@&8et pay thicknessK*@&8et pay thicknessK h K *@

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( Structural Interpretation o Seismic ain Li&estone.

i$ure 9A i&e contour &ap on the top o! the anikot or&ation.

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Aamir et al. '

i$ure 0A 8epth contour map on the top o the Sui "ain #imestone.

i$ure 6A 8epth contour map on the top o the Rani$ot %ormation.

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2 Structural Interpretation o Seismic

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Aamir et al.

7RI=I6A# =AS I6

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Structural Interpretation o Seismic .;% */64% Practical Seis&ic #nterpretation% #,DCPublishers% Boston% p.2*2A299.

Bender% .-.% and ,.1. a'a% *//4% Geolo$y o! Pakistan% Gebruder Borntrae$er% Berlin X Stutt$art% p.**A9:.

Dobrin >.B and C. ,. Savit% */66% #ntroduction to GeophysicalProspectin$ ourth ;dition% >cGra" ,ill Co&pany% p. 67:A602.

-adri% #.B.% *//4% Petroleu& Geolo$y o! Pakistan Pakistan Petroleu&Ltd.% p.292A2/2

-a'&i% 1.,.% and >. Q. an% *//0% Geolo$y and ectonics o! PakistanGraphic Publishers% -arachi% Pakistan% p. @6:A477.

a'a% ,.1. and . 1h&ad% *//7% ,ydrocarbon potential o! Pakistan. Xourn. CanadaAPakistan Cooperation Otta"a% p./A20.

Schlu&ber$er% */96% Lo$ #nterpretation charts. Schlu&ber$er NellServices% #nc. ,ouston% p.*7A:7.