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 BLOCK D9 (NELP III)

SUMMARY OF INTEREST

OPERATIONS

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Block D9 Map


2009 Operations
2009 marked the commencement of the drilling phase of the block’s exploration programme. There are three play types postulated to be present in the block: structural (anticlines – northern, central and southern); stratistructural; and stratigraphic. The D9 joint venture has initially focused exploration efforts in the north west corner of the block covering an area of approximately 3,640 km2.
The first exploratory well in the D9 block, KG-D9-A1, was to evaluate the prospectivity of the Middle and Lower Miocene sands deposited in the lower slope regime in a distal toe thrust structural play in the central anticline.

Observations from A1 Well Data

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In the interval 3,235–3,242 m from rotary table (‘RT’) from the Early Pliocene section, observed resistivity up to 30 ohms in the pilot hole where no samples could be collected.

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In the interval of 3,500–3,650 m ('RT') of Upper Miocene age, several thin sandstone and siltstone units having thickness of 1–3 m were encountered with a total gas > 2 per cent with mostly C1 component. The maximum resistivity of up to 3 ohms was observed in the interval 3,510–3,515 m RT with total gas of 1 per cent.

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The first target in the Middle Miocene level encountered siltstone in the interval 4,160–4,185 m RT and 4,370– 4,500 m RT with low resistivities and insignificant gas shows.

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The deeper target in the Lower Miocene section encountered limestone in the interval 4,695–4,710 m
RT contrary to the expected (prognosed) coarse clastic. No significant gas shows were observed in this interval.

Inference from A1 Well Results

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In the Upper Miocene, the KG-D9-A1 well encountered several thin sandstone units with good gas shows (C1 dominant) suggesting the possibility of a biogenic source. Studies are being conducted to identify the likely thick reservoir prone areas based on the detailed sedimentological studies of KG-D9-A1 well cores and cuttings, and D6 block subsurface data. These reservoirs are likely to be on the flanks of anticlines in the mini-basin set up.

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In the Middle Miocene, the KG-D9-A1 well encountered siltstone with low resistivity and insignificant gas shows. This zone needs to be thoroughly re-evaluated to identify the probable reservoir entry directions.

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Tight limestone was encountered in the Lower Miocene level in the well. The data suggests this limestone package was transported from the shelf area to the north through a slope channel system. This will be confirmed by side wall core and cutting sample analysis data.

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The remaining prospectivity of all the anticlinal closures (north and central) cannot be ruled out because presence of effective reservoirs and biogenic source will make them viable targets.

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The KG-D9-A1 well drilled into the Lower Miocene section did not penetrate the Cretaceous and Palaeocene sections thus their prospectivity remains unchanged.

 

 
 

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