Bach Ho is the largest reservoir in the continental shelf of Vietnam. This field consists of numerous oil pay zones, from Lower Miocene, Upper Oligocene, Lower Oligocene to Cenozoic fractured basement, which is known for a unique oil zone with nearly 2,000m in thickness. This oil zone features a large number of naturally flowing wells with production rate of approximately 1,000 tons per day, contributing to over 90% of total production.