Oil exploration situation, significant discoveries and future exploration fields in China offshore area

摘要

China offshore oil industry is rapidly growing for 20 years since the foundation of CNOOC. In Bohai Sea area, the Quaternary tectonic movement causes the forming of big oilfields in Neogene formations in late time. This new knowledge and developing technology of exploration and development make the discovery of a lot of large oil fields, such as QHD 32-6, NB 35-2, CFD 11-1, CFD 12-1, BZ 25-1, PL 19-3, LD 27-2, etc., each of them has more than 100, 000, 000 tons of reserve in place. Directed by the theory of "oil migration along structural ridge", we have found some groups of oil fields in the Pearl River Mouth basin, such as Huizhou, Xijiang, Lufeng and Liuhua oilfields, and make the annual oil production over 10,000,000 tons in the basin. In the Yinggehai --Qiongdongnan basin, DF 1-1, LD 22-1 and other big gas fields have been discovered after the finding of YC 13-1 gas field and summarizing of the rule of gas vertical migration and episodic accumulation in the diapir zone. These significant discoveries in exploration bring CNOOC to a rapid growing period, and a lot of big oil and gas fields have been put into production or building. It is predicted that annual oil and gas production of CNOOC will be doubled to 40, 000,000 TOE in 2005. There are wide fields for oil exploration in China offshore area: A lot of traps in shallow formations are waiting for drilling in Bohai Bay and Pearl River Mouth basin; Yinggehai -Qiongdongnan basin and East China Sea basin are rich gas accumulation areas waiting for exploration; Some pre-Tertiary residual basins have a wide distribution in China offshore area where tectonic movement was more stable, and would be favorable new field for oil and gas exploration; A lot of lowstand sand bodies in the deepwater area in the South China Sea are also exploration targets with brilliant prospects.