Oilex Continues Testing at Cambay Field, Basal EP IV Oil Zone

Oilex advised that Cambay-73, the third well in the Cambay Field appraisal program, is at intermediate casing point at a depth of 1,600 meters. A workover rig has been mobilized to the location of Cambay-19Z and is rigging up to continue the testing program of the extensions to the Basal EP IV oil zone.

Cambay-19Z appraisal well


  • Primary: Basal EP IV - oil
  • Eocene EP III and EP IV - oil
  • Secondary: Oligocene OS II - gas
  • Miocene Basal Sandstone - gas
  • Deccan Fractured Basement - oil

Status: A workover rig has been mobilized and is rigging up on site.

Operations: Testing operations are likely to commence within the next 5 - 7 days.

DST #2 will be carried out over a potential oil zone similar to the Basal EP IV. The test interval will comprise an additional 29 meters of perforations over a number of separate zones of variable thickness between 1,990 - 2,068 meters.

Comment: The Basal EP IV zone is present in at least three old wells on the Western High Block. These old wells were either not tested or were poorly evaluated and appear to have a similar log response to the zone that was successfully tested in Cambay-19Z.

Preliminary indications from seismic and the analogous well logs are that the Basal EP IV may extend across the Western High Block.

The Basal EP IV zone is also a primary objective of the well Cambay-73 currently drilling.

Cambay-73 appraisal well


  • Primary: Oligocene OS II - gas
  • Eocene EP III and EP IV - gas
  • Basal EP IV - oil
  • Secondary: Miocene Basal Sandstone - gas
  • Deccan Fractured Basement - oil
  • Status: Spud: 03:00 hrs July 25, 2008
  • Current Depth: 1,600 meters
  • Total Depth (TD): 2,205 meters (planned)

Operations: Completed wireline logging and conducted an open hole drillstem test (DST #1) of the OS II objective. The interval that was tested comprised about 2 meters of shaly sandstone reservoir interpreted
from wireline logs. Gas shows were recorded while drilling and in DST #1 the gas flowed at a rate too small to measure. 30 liters of oil was recovered from the test string. No formation water was recovered during the test.

Comments: Pressure data indicate that the zone is at virgin pressure and, with the oil recovery, suggest that it is part of the Western High geological compartment rather than the Basin Gas Area.

Cambay-73 is a vertical well that has been located to drill the OS II and EP III-IV primary objectives on the eastern side of the fault that separates the Western High Block from the Basin Gas Area. It was anticipated that both zones would be gas bearing in this well and it now appears that the oil zone of the Western High Block extends further east than previously thought.

The well is also designed to intersect the Basal EP IV oil zone on the Western High Block at a favorable structural location.

Participants in the Cambay Production Sharing Contract are:

  • Joint Venture Party Participating Interest
  • Oilex Ltd (Operator) 30%
  • Oilex NL Holdings (India) Limited (100% owned by Oilex 15% Ltd)
  • Gujarat State Petroleum Corporation 55%