HOUSTON, Aug 8 (Reuters) - Occidental Petroleum ( OXY )

on Thursday said its goal to add 170,000 barrels of oil and gas

per day from its acquisition of oil producer CrownRock will take

longer than expected.

Weather events and other operational downtime led to the

production rate of 156,000 barrels per day in the second

quarter, according to Occidental's president for U.S. onshore

resources Richard Jackson.

The comments were made during a call with analysts to

discuss the company's second quarter results.