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Tax code:. Industry classification:. VSIC: Support activities for petroleum and natural gas extraction. The subject engages in exploring and exploiting oil and gas of the block offshore Vietnam. Black Lion is the first field to be discovered and developed in the basin.

This oil field was discovered in and brought on stream in Golden Lion was the next field to be discovered in and commenced production in White Lion was discovered in Nov Its commercial production from the field began in Sep Brown Lion was discovered in Address: No.

Address: 25th Floor, Charmvit Tower, No. Address: Floor 16, Petro Hotel, No. Address: 25th Floor, Charmvit Building, No. Company Standard Report. Latest updated available information. Tectonic map of Vietnam and environs, including Tertiary basins. Tectonic map of Cuu Long basin.

Seismic line across two fields and prospect in Cuu Long basin. Figure 2. Diagrams showing various types of fractures: regional joints, those associated with extension, and those associated with strike-slip faulting. Figure 3. Stratigraphic section of Cuu Long basin. Figure 4. Two-dimensional model of the play concept for the Cuu Long basin.

Source Rocks The effective source rocks are the Upper Oligocene shale that is present throughout the basin and the Lower Oligocene interbedded shale. Figure 5. Organic richness and generation potential in Oligocene sediments. Hydrogen index versus Tmax , Oligocene sediments. Fractured Basement Reservoir Fractured basement reservoirs are the unique characteristics of the Cuu Long basin, although there are other oil discoveries in clastics and volcanics plays. The first oil discovery in basement was made by Vietsopetro in the Bach Ho field in Oil was stored in macro-fractures, micro-fractures, and vuggy pores.

The matrix porosity of the magmatic body is negligible. Fractures inside the basement may originate from one or a combination of the following factors: 1 The cooling of the magmatic body 2 Tectonic activity 3 Hydrothermal processes 4 Weathering and exfoliation. However, the tectonic activity and the hydrothermal processes are practically the main factors that control the porosity of the fracture systems. Recent studies Cuong, T. The compression probably resulted from the restraining band of a strike-slip motion along the E-W trending lineaments.

Most fractures inside the basement are of high dip angles o. Their strike directions vary from one field to another, or even within a field. Wells in fractured basement usually flow at very good rates up to 14, bopd.

The depth of the top of the basement reservoir is another issue. The basement tops of current oil fields are about - mss. Their oil columns range from m. It seems that the depth of top of basement is not a critical factor for exploring the oil in the basement. Oil produces from both basement and volcanics sections. The estimated reserves are about 40 mmbbl. Ruby Field The Ruby field is located at the northeast part of the basin.

Oil is produced dominantly from Miocene sandstones and Oligocene volcanics. Current production is about 20, bopd. Rang Dong Fields Oil is produced mainly from fractured basement. A minor amount is from Miocene sandstones. Current production is about 60, bopd. From field planning, production was expected to have begun by the end of Ca Ngu Vang Prospect This is characterized by the deepest basement reservoir, with flow rate of bopd and 6.

The preliminary reserves of this prospect is 90 mmbbl. We also would like to thank our colleagues who have offered many good ideas during the preparation of this article. A special thanks is due the Exploration Department of the Hoan Vu JOC for providing us with favorable conditions to preparation of this article.

References Chang S.