subs ti tuition area myanmar expl report

8/2/2019 Subs Ti Tuition Area Myanmar Expl Report

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PremieroilMyanmar

reservoir provenance for fan systems. Erosion of the prograding del ta systemsoccurs during periods of sea lt-vt. ; fall (lowstand systems tract) and the resu ltanterosional products are transported and deposited out in the basin as basin floorfans or on the shelf margin as slope fans. Deposition during lowstands isimportant for prospectivity a s well sorted san ds may be transported out in to thebasin a nd deposited within potential source rocks an d seals. Within the MiddleMiocene section of Yemahnaung-1 slope fan sands have been identifiedcorrelating to the Middle Miocene delta system to the eas t. Several sequenceboundaries a re identified both within the well an d from seismic (Fig. 19) an deach may have associated distal erosional products producing the potential forstacke d pay.A chronostratigraphic diagram has been produced, from the seismic and welldata, orientated west to east from Myeik-1 onto the platform (Fig. 20).The majortransgression at the top of the Lower Miocene is evident at 15.0 Ma. and theMiddle Miocene delta system can be seen to back step to the eas t. In general therelative thickness of the progradational sequences is shown to decrease upthrough the Miocene relating to a decrease in sediment supply or reduction inaccommodation space due to the transgression.

4.3 Regional ProspectivityA schematic diagram highlighting the potential prospectivity of th e AndamanSea Basin on a regional scale is presented a s Fig. 21. The potential play typesidentified are listed below:

Basement highCarbonate platforms (Yadana Field & M 15 to M18)Lower Miocene pinch-out (tested by Dawei- 1)Miocene compactional roll over on Basement highLower Miocene tilted fault block (Yetagun Field)Apron fan systemMiddle Miocene rotated delta front s an dsMiocene slope an d basin floor fansMiddle Miocene sands truncation by Top Miocene unconfonnityIncised valleySubmarine canyonPlio-Pleistocene tilted fault block, up-thrown trap (AZY- 1, ALB- 1)Plio-Pleistocene tilted fault block, down-thrown trapPlio-Pleistocene horst block (ATZ- 1)Plio-Pleistocene 4 way roll over due to listric fault movement (SPH-1)Rim syncline and p inch o ut of Plio-Pleistocene against shale diapirFlower structure (Zagawa-1)

Having identified the potential for a number of plays on a regional scale thismodel has been applied to the Substitution Area in trying to identify potentialprospectivity.

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RemierOilMyanmarProminent sequence boundary development in the delta caus ing erosion.Potential slope fan deposits identified in offset wells and seismic.Major transgressions at 9.2 & 15.0 Ma. providing regional top an d baseseals.Stratigraphic trapping of fan sands within the Middle Miocene source rock.

Six prospects have been identified within the Middle Miocene fairway, two ofwhich are constrained by 3D data . One prospect, MFl, is considered ready fordrilling. Prospect definition an d interpretation of depositional environmentshave been greatly aided by the 3D da ta set , in particular the u se of seismicattribute mapping. The prospects are known as the MF ("Miocene Fan") groupand are numbered from 1 to 6 and are described below:

9.8.1 MF1 ProspectA seismic data example is presented a s Fig. 53 an d prospect maps are presentedas Fig. 54 and Enc. 15.The MF1 prospect primarily lies within the Yetagun 3D data area approximately2.5 kms. west of Yetagun North-1 and covers an area of approximately 56 sq.krns. Due to the 3D da ta coverage seismic attributes, in particular amplitudes,have been used to define the prospect in detail. The prospect occurs a s adistinct area of high amplitudes, both in map view and section (Figs. 55 & 56),which have been forward modelled as a gas charged, high porosity sand. A gaswater contact (GWC) has been recognised to the west of the limit of the 3D da tafrom flat spots occurring on the 2D data (Fig. 56). The mapped flat spotcorrelates to a constant depth contour increasing confidence in theinterpretation of a GWC (Fig. 57) . The crest of the prospect occurs atapproximately 8,400 ft. with the interpreted GWC at approximately 10,600 ft.The prospect dips to the west at a present day angle of 10 degrees, with theinterpreted reservoir pressure lying below the fracture gradient of the encasingMiddle Miocene shale .The trapping mechanism is predominantly an up-dip stratigraphic trap althoughthe north-east crest of the structure is closed by the Yetagun North fault, withthe Middle Miocene shale providing the top and base seal . The Yetagun Northfault has been proved to seal by the YN-1 discovery.In addition AVO cross plotting analysis has corroborated the interpretation ofgas charged sand causing the high amplitudes, but also indicates that apossible oil rim may be present on the structure, down dip of the flat spot,although further work is recommended to confirm this .

9.8.2 MF2 ProspectA seismic data example is presented a s Fig. 58 and prospect m aps are presentedas Fig. 59 and Enc. 16.The MF2 prospect has been mapped solely from 2D seismic data and covers anarea of approximately 80 sq. kms. The prospect ha s been defined by mappingan area of amplitude anomalies with mounded seismic character. Two levels ofhigh amplitude reflectors are present and have been termed MF2 high and MF2low. The prospect is located to the eas t of Myeik-1 in the hanging wall of the

Premier Petroleum M yanmar Ltd., October 1999 Page 41 of 65



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PremieroilMyanmarMyeik fault block and it is presumed that sands have been "ponded" into thisgraben. The depth of the Prospect High ranges from approximately 11,600 ft. to14 ,00 0 ft., with the Prospect Low approximately 500 ft. deeper. The dep th of theprospect carries a risk of reduced reservoir quality due to compaction and hightemperatures and over pressure.The trapping mechanism is stratigraphic with the Middle Miocene shaleproviding the top and base seal.

9.8.3 MF3 ProspectA seismic dat a example is presented a s Fig. 60 an d prospect m aps are presentedas Fig. 61 and Enc. 17.The prospect is identified solely from 2D data and is located within a grabenapproximately 2 0 km. due west of Dawei-1. The prospect covers an area ofapproximately 180 sq. kms. and exhibits high amplitudes, section thickeningan d down lapping events indicative of fan deposition. Depth of the prospectvaries from 5,800 ft. to 7,000 ft.The trapping mechanism is interpreted to be both stratigraphic and faultcontrolled in part to the east, with the Middle Miocene shale providing the topand base seal.

9.8.4 MF4 ProspectA seismic da ta example is presented a s Fig. 62 and prospect maps are presentedas Fig. 63 and Enc. 18.MF4 has been mapped solely from 2D seismic and occurs as a number of highamplitude reflectors and on one strike line with a very clear mounded, chaoticseismic geometry indicative of a bas in floor fan (Fig. 63) . The prospect covers anarea of approximately 130 sq. kms. a nd is deposited in a graben to the northeas t of M12-B 1. The depth of the prospect ranges from 1 1,600 ft. in the e ast , to21,000 ft further into the basin to the west. The depth of the prospect carries arisk of reduced reservoir quality due to compaction and high temperatures andover pressure.The prospect is stratigraphically trapped with the Middle Miocene shaleproviding top and base seal.

9.8.5 MF5 ProspectA seismic data example is presented a s Fig. 64 and prospect maps are presenteda s Fig. 65 and Enc. 19.The MF5 prospect has only 2D data coverage but is recognised as a distinctamplitude anomaly, both in map view and section (Figs 65 & 66). The aeriallimits of the prospect have been mapped from seismic amplitudes, seismiccharacter and pinch out limits and cover an area of approximately 60 sq. kms.The trapping mechanism is purely stratigraphic with the Middle Miocene shale

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AIANW%'- M12SHAI IOW

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Input Data

VanoblnsnapoI>90:na,mau,m

I

GHvn(:m ntriano3586624

r ,,crIIGrc, m

17cg)l fill

triang84 5

walur

Net to grassitrlang75.586 6

I an If 11

Pnrasty

triang 13.5dept, 17Will it

trlang22.2I VI (1/

[3g)3/rbleng

209

Oycnrtru

PrornlorlTl(.

asrectit, .trang541,

Geological Cba"cc or success. 200

Reserves Summary

UnriskodGas-in-Placenet

1004P902849

P50.4062P1o6104Mean4295

P-It ,'I at mean.

I ully risked mean

Overall chance of 11l'-c'ss200

Production %,,, g Imeresr100.001 xploration Workln9 prterest 100.00

1r

Risk FactorsPlay finance 00

Recoverable Gas

1003b rat1682 1682

2438 2438

3712 3712

2578 2578

43, 3

516 516

re.

urologyPnrnsl.y'yp

ap It, 1,

I ap-rr.n

Im~nverah,l,r Gas fm0 ul

Comments.

first pass nsln3stab model



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subs ti tuition area myanmar expl report

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