WELL SUMMARY
The Sunset-1 well was drilled by the semi-submersible MODU, Ocean Bounty in PSC ZOCA 95-19 in the Timor Sea, 450 km north west of Darwin, between Northern Australia and the island of Timor. Geologically the area lies within the northern portion of the Bonaparte Basin, one of the several major basins on the Australian North West Shelf. Sunset-1 was designed to test the fluvio-deltaic sandstones of the Upper and Middle Jurassic Plover Formation.
The well spudded on 22 Septermber 1997 and drilled at total depth of 2420 mDF, which was reached on 13 October 1997. After completion of final logging and testing the well was plugged and abandoned as a gas condensate discovery and the rig was released on 5 November 1997.
General Well Info
Well Name: Sunset-1
Well Classification/Type: Exploration
Operator: Shell Development (Australian) Pty Ltd
Participants/JV’s: Shell Development (Australian) Pty Ltd
Woodside Petroleum (Timor Sea 19) Pty Ltd
BHP Petroleum (95-19) Inc.
Permit: ZOCA 95-19
Field: N/A
Basin: Bonaparte
Sub-Basin: -
Well Location: Seismic Reference: Line 97-10, SP 633
Latitude: 009°38’36.369”S
Longitude: 127°58’34.759”E
Easting: 387 683.26 m E
Northing: 8 933 838.32 m S
Projection: UTM Zone 52, CM 129
Elevations:
Water Depth (m): 238.5m
Datum: Drill Floor (DF),
25 m above LAT
TD Depth: 2420 mDF
Rig Details:
Rig Name: Ocean Bounty
Contractor: Diamond Offshore
Rig Type: Semi-submersible MODU
Spud Date: 22 September 1997
TD Date: 13 October 1997
Rig Release: 5 November 1997
Well Status: Plugged & Abandoned
Stratigraphy | ||||||
Formation | Seismic TWT (msec) | Tops | Thickness (m) | Lithology | ||
(m MDDF) | (m TVD DF) | (m TVD Subsea) | ||||
Sea floor | 314 | 264 | 264 | 239 | 259 | Returns to seabed |
Oliver Fm | 538 | 523 | 523 | 498 | 494 | Return to seabed |
Cartier Fm | 919 | 1017 | 1017 | 992 | 127 | Return to seabed |
Hibernia Fm | 1016 | 1144 | 1144 | 1119 | 299 | Return to seabed |
Johnson Fm | 1204 | 1443 | 1443 | 1418 | 78 | Return to seabed |
Vee Fm | 1250 | 1521 | 1521 | 1496 | 235 | Return to seabed |
Wangarlu Fm | 1396 | 1756 | 1756 | 1731 | 335 | Claystone |
Darwin Radiolarite | 1636 | 2091 | 2091 | 2066 | 31 | Argilaceous Calcilutite |
Echuca Shoals Fm | 1650 | 2122 | 2122 | 2097 | 8 | Claystone |
Elang Fm | 1655 | 2130 | 2130 | 2105 | 25 | Claystone |
Plover Fm | 1670 | 2155 | 2155 | 2130 | 265+ | Interbedded sandstone, Claystone and siltstone |
TD | 1800 | 2420 | 2420 | 2395 | - |  |
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FORMATION EVALUATION
Formation Evaluation | |||||||
Sampling | |||||||
Cuttings | Sidewall Cores | Conventional Cores | |||||
Interval (mDF) | Sample Rate | Type | Shot/Cut | Recovered | Core No. | Interval (mDF) | Recovery (%) |
| 1775-2420 m | 3 | MSCT | 35 | 33 | 1 2 3 4 5 6 7 | 2094.0-2121.5 2121.5-2123.0 2154.0-2193.0 2193.0-2214.0 2201.0-2214.0 2214.0-2226.0 2226.0-2249.0 | 100 100 99.2 90.4 100 83.3 96.6 |
Cutting Distribution
Gas Measurements
Hydrocarbon Indications
Sidewall Cores
Percussion Sidewall Cores
No percussion sidewall cores were taken in Sunset-1.
Mechanical Sidewall Cores
A total of 35 mechanical sidewall cores (MSCT’s) were attempted in Sunset-1 over the interval 1790-2399 m with 33 cores recovered.
Conventional Cores
Micropalaleontology/Palynology
Palynological analyses were undertaken on sidewall cores and cutting samples from Sunset-1. There were 23 seidawall core samples and 43 core chip samples over the interval 1790 mDF to 2334
Geochemical Analysis
A total of 57 samples over the interval 1790 mDF to 2334 mDF were analyses by Geotechnical Services.
Measurement While Drilling
DIR-FE (Directional, gamma ray and electromagnetic wave resistivity) data in the 36” and 16” hole section from 239 to 1775 mDF.
DPR-VSS (Dual propagation resistivity resistivity, gamma, directional, temperature, vibration and stick slip) data in 12 ¼” hole from 1775-2420 mDF.
Wireline Logging
Testing
Formation pressures tests and smaples were taken in Sunset-1 using MDT (Modular Formation Dynamics Tester) tool.
MDT
DST Data