Exploration in my country's Bohai Sea discovered the world's largest metamorphic oil field

Bozhong 26-6 Oilfield is located in the southern waters of the Bohai Sea, about 170 kilometers away from Tianjin City, with an average water depth of 22.1 meters. Since its discovery in 2023, it has insisted on continuing exploration, and has drilled multiple evaluation wells. Among them, Bozhong 26-2 North 2 well encountered an oil and gas layer of 118 meters, and tested an average daily oil production of over 390 cubic meters and a daily gas production of over 50,000 cubic meters. It set a record for the highest production capacity of new drilling wells in the oil field, further expanding the oil field's reserve scale.

According to the normal recovery rate calculation, the Bozhong 26-6 Oilfield can extract more than 30 million cubic meters of crude oil. After being refined into gasoline, it can meet the daily transportation needs of urban residents with a population of one million for more than 20 million cubic meters. In 2018, more than 11 billion cubic meters of natural gas can be mined at the same time, which can meet the household gas needs of urban residents with a population of one million for more than 60 years, and has considerable social and economic benefits.

The reservoir of the Bozhong 26-6 oil field is buried in a buried hill several kilometers deep on the seafloor. It is mainly composed of metamorphic rocks. It is located in an area with continuous strong activity of extension-strike-slip composite faults. . Traditional theories believe that due to the continuous strong activity of faults in this area, deep oil and gas reservoirs are easily destroyed and it is difficult to form large-scale oil and gas accumulation. Previously, more than 80 deep wells drilled by many well-known foreign oil companies have not made large-scale discoveries.

CNOOC researchers conducted scientific and technological research on the deep layers of the strong active fault zone in the Bohai Sea, innovatively proposed the theory of deep oil and gas exploration in the extension-strike-slip composite fault zone, and independently developed ultra-low frequency all-round seismic exploration technology , conquered the deep seismic imaging of complex fault zones, promoted the expansion of the main battlefield of Bohai Sea exploration from shallow to deep, and expanded the dominant buried hills to hidden buried hills, and guided the discovery of multiple billion-ton oil fields such as Bozhong 26-6 Oilfield.

The breakthrough in theory and technology of deep oil and gas exploration in the extension-strike composite fault zone has further consolidated the material foundation for increasing reserves and production in the Bohai Oilfield, and has provided a platform for my country's offshore oil industry exploration and development to move into deep and complex fields. development, providing a solid theoretical and technical reserve.