LAFAEK, Well Description

Well Summary

The Kitan-1 exploration well is located in JPDA 06-105 in the northern Bonaparte Basin. It is located approximately 125 km from the southeast coast of Timor-Leste and 550 km from Darwin. The current equity in JPDA 06-105 is Eni JPDA 06-105 Pty Ltd 40%, Inpex Timor Sea Ltd 35% and Talisman Resources (JPDA 06-105) Pty Ltd 25%. The Kitan Prospect is situated 15 km east of the Laminaria oil field and 8 km eastnortheast of the Buffalo oil field. The prospect is defined on the Ikan 3D seismic as an east–west-trending tilted fault block with the main risk being the integrity of the structure-bounding faults. Kitan-1 was designed to test the prospectivity of the Callovian Laminaria Formation and Bathonian Plover Formation.


Kitan-1 was spudded in 310.9 m of water on the 8th January 2008 utilising the semisubmersible
“Songa Venus” MODU. It reached total depth (TD) at 3568 mMDRT on 3rd February 2008. The primary objective Laminaria Formation was intersected at 3356.5 mMDRT, 76.5 m low to prognosis. The variation between the predicted and actual depth is related to the PSDM velocities being too slow over the well location. On entering the reservoir hydrocarbon shows in cuttings was confirmed using real-time LWD data. A conventional core was cut recovering 100% of the 30 m attempted. Significant hydrocarbon fluorescence was described from the core.

The final wireline log program including an MDT pressure and sampling run confirmed a 27 m net oil column between 3356.5 to 3406.0 mMDRT. An average porosity of 11.5% and water saturation of 30% is interpreted. Analysis of MDT pressures indicates a clear oil gradient of 0.915 psi/m (0.643 g/cc). MDT samples obtained within the reservoir recovered good quality 59° API oil. The oil–water contact is interpreted to be 3406.0 mRT (3381.3 mTVDSS). A DST was conducted over the perforated interval 3357.5 – 3390.0 mMDRT once the 244 mm (95/8") casing was run. The well delivered a facility-constrained maximum flow rate of 6,100 BOPD through a 12.7 mm (32/64”) choke during the clean-up phase. Sampled flow rates varying from 4,329 BOPD through a 11.1 mm (28/64”) choke to 2,488 BOPD through a 7.9 mm (20/64”) choke were also returned during main flow periods. A PLT survey performed by wireline, followed by a bottom-hole sampling completed the production testing on Kitan-1. The well was plugged and suspended as an oil well on 3rd March 2008.

Lithology and Formation Tops.

AGES	FORMATION	LITHOLOGY	Depth		THICKNESS (m)
			mMDRT (m)	mTVDSS (m)
1	2	3	4	5	6
Recent - Pliocene	Barracouta Fm. / Sea Floor	limestone - inferred	335.6	-310.9	600.1
Miocene	Oliver Formation	limestone - inferred	935.7*	-911.0*	847.0
Early Miocene	Cartier Formation	limestone/sandstone - inferred	1782.7*	-1758.0*	716.3
Oligo - Eocene	Prion Formation	limestone/claystone - inferred
Early Eocene	Hibernia (Grebe) Formation	limestone/chert - inferred	2499.0*	-2474.3*	121.4
Paleocene	Johnson Formation (Top Paleocene)	Calc. Claystone/Marl	2621.0	-2595.7	157.5
Maas - Camp	Turnstone Fm. (Base Tertiary)	Argillaceous Calcilutite	2778.5	-2753.2	60.0
Camp - Sant	Fenelon Formation	Marl	2838.5	-2813.2	43.0
Santonian	Gibson Formation	Calcareous Claystone	2881.5	-2856.2	33.5
Turonian	Woolaston Formation	Calcareous Claystone	2915.0	-2889.7	33.0
Late Albian	Jamieson Formation	Claystone	2948.0	-2922.7	169.9
Aptian	Darwin Formation	Claystone	3118.0	-3092.6	10.0
Barremian	Echuca Shoals Formation	Claystone	3128.0	-3102.6	38.0
Haut -Vallenginian	Flamingo Formation	Claystone	3166.0	-3140.6	149.9
Tith - Oxfordian	Frigate Formation	Claystone	3316.0	3290.5	40.5
Callovian	Laminaria	Sandstone/Claystone	3356.5	-3331.0	73.4
na	Oil-Water-Contact	Log Interpreted	3406.0	-3381.3
Bathonian	Plover Formation	Sandstone	3440.0	-3414.4	> 127.9
Total Depth			3568.0	-3542.3

Cores
Sidewall Cores
Both rotary and percussion sidewall cores were taken during the running of Suite 1 wireline logs at the end of drilling the 311 mm (12¼”) hole section. Rotary sidewall coring (MSCT) was performed in Run 5, resulting in 19 cores recovered from 25 attempted. Routine Core Analysis (RCA) was carried out by GeoTech lab. Percussion sidewall cores (CST) were taken in Run 6, resulting in 50 cores bought, 3 lost, 6 empty and 1 rejected, out of 60 attempted.

Convetional Cores
Conventional coring services were supplied by Corpro Systems Ltd, with one core cut in the 311 mm (12¼”) hole section from 3371.0 m to 3401.0 mMDRT in the Laminaria sandstone. A recovery of 30.0 m (100%) was achieved,

Core	Core Depth (m)	Adj.* (m)	Corrected Core Depth (mMDRT)	Recovery (%)	Formation
1	3371.0 – 3401.0	+1.00	3372.0 – 3402.0	100	Laminaria

* Depth adjustment applied to core (driller’s) depths to match the wireline logs. Positive (+)
indicates adjustment downward.

Routine Core Analysis (RCA) was carried out by GeoTech lab. Special Core Analysis (SCAL) was carried out by ACS Laboratories on selected core plugs. At the time of writing this report final SCAL results were not completed. Before core data (porosity, permeability) was used in any processing, it was corrected for overburden stress.

Wire line Logging
Schlumberger provided wireline logging for the 311 mm (12¼") hole section. One open-hole logging suites and three cased hole logging suites were run. Six openhole wireline logging runs were completed on the Kitan-1 well. After the 244 mm (9⅝”) production casing was cemented in place, a cement bond log (Suite 2) was ran to check the integrity of the casing/cement job.
Schlumberger’s new Sonic Scanner tool was used for the first time for this type of analysis however, the tools held up at 3442.9 mMDRT. Despite numerous attempts to reach the shoe the log recorded data from this point upwards without further problems.
To set DST/TCP string in place correlation logs (Suite 3) were conducted.The final suite (Suite 4) of logs was conducted after the well had been shut-in for the final build-up phase of the DST. Run 1 comprised the PLT flow survey across the perforation zone, however the initial tool string run had insufficient weight to pass down hole. The survey was re-run successfully after some weight-bars had been included.

Suite		Run	Date		Tool String	Interval (m MDRT)			BHT (°C)		Time since circ.
Open-Hole Logging
Suite 1		Run 1	04-Feb-2008		PEX-HRLA-EMS	3568 – 335.6			106.0		17.00
		Run 2	05-Feb-2008		GR-MDT 41 pressure points, 3 sample points, 2 x 450cc PVT samples at each point	3568 - 3256			116.0		25.17
		Run 3	05-Feb-2008		HNGS-MSIP-FMI Sonic Scanner run instead of DSI	3568 - 2500			118.9		45.92
		Run 4	06-Feb-2008		GR-VSI4 50 stations, including 20 checkshots, last good station at 1748m	3568 - 368			106.0		56.35
		Run 5	06-Feb-2008		GR-MSCT 25 cores cut, recovered 19, empty 6	3460 – 3357.5			119.4		67.42
		Run 6	06-Feb-2008		GR-CST 60 shots, bought 50, lost 3, empty 6, rejected 1	3568 – 2500			119.0		78.92
Cased-Hole Logging
Suite 2		Run 1	13-Feb-2008		CBL-VDL Tools held up at 3442.9 mMDRT, Sonic Scanner used for cement evaluation	3442.9 – 2492					11.06
Suite 3		Run 1	17-Feb-2008		GR-CCL Marker sub on DST string not detected	3568 – 3000					N/A
		Run 2	18-Feb-2008		GR-CCL Marker sub still not detected	3568 – 3000					N/A
Suite 4	Run 1		23-Feb-2008	GR-PLT Run in hole unsuccessful, not enough weight. Add weight and re-run			3410 – 3337			N/A
	Run 2		23-Feb-2008	GR-PLT Survey 4 stations			3410 – 3337			N/A