Thailand: Coastal finds Miocene trend extension

By OGJ editors
HOUSTON, June 15 – Coastal Energy Co., Houston, said its Bua Ban North B-06 well cut 69 ft of net pay with 28% porosity in Miocene, extended lowest known oil in the fault block by 100 ft, nearly tripled structural closure to 425 acres, and found the highest porosity Eocene pay zone encountered in the basin.

The well went to 6,800 ft true vertical depth, and MDT analysis confirms it to be in communication with the B-02 and B-04 wells. Samples tested 36° gravity oil.

B-06 also encountered 17 ft of net pay with 22% porosity in the Eocene in the western upthrown fault block, which has also been referred to as the Bua Ban North Terrace.

Coastal expected the well to encounter a wet section of the reservoir and be used for aquifer support. The company will drill the B-07 well to confirm the MDT data that indicate an oil-water contact at 3,825 ft. B-07 can be used for water injection.

Then the B-08 well on the eastern side of the field and northeast of the B-03 well will further evaluate the full extent of this closure. If successful, this would materially increase the size of the productive field, the company said.

The high quality of the Eocene reservoir confirms the assessment that the Eocene is conventionally producible above 6,500 ft. The B-06 well supports further exploration to the north and west and reduces the risk of the company’s Eocene targets, Coastal said.