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1 Exploration and Production Research Institute, China Petroleum and Chemical Corporation (SINOPEC), No. 31 Xueyuan Road, Haidian District, Beijing 100083, People's Republic of China; yuanzhuangchen{at}163.com
2 School of Resources and Information, China University of Petroleum, No. 18 Fuxue Road, Changping, Beijing 102249, People's Republic of China; liulf{at}cup.edu.cn
3 Southern Petroleum Exploration & Production Company, SINOPEC, Kunming, Yunnan 650021, People's Republic of China
4 Southern Petroleum Exploration & Production Company, SINOPEC, Kunming, Yunnan 650021, People's Republic of China
5 Gas Company, SINOPEC, Beijing 100011, People's Republic of China
Yuanzhuang Chen received a B.S. degree (1986) from Yangtze University, an M.S. degree (1990) from the Southwest Petroleum Institute, and a Ph.D. (2005) from the China University of Petroleum (Beijing). He worked in the Nanning Research Institute of the Southern Petroleum Exploration & Production Company, China Petroleum and Chemical Corporation (SINOPEC) for 14 years. Currently, he is a senior engineer and works at the Joint Postdoctoral Program of Exploration and Production Research Institute, SINOPEC, and China University of Geosciences (Beijing). His research interests include petroleum geology, sedimentology, and reservoir characteristics.
Luofu Liu received a B.S. degree from Yangtze University in 1982, an M.S. degree from Lanzhou Institute of Geology, China Academy of Sciences, in 1985, and a Ph.D. from the University of Bristol, United Kingdom in 1992. Currently, he is a professor at the China University of Petroleum (Beijing), specializing in petroleum geology, sedimentology, and organic geochemistry.
Xunyu Cai received a B.S. degree from Yangtze University in 1985 and a Ph.D. from the Chengdu University of Sciences and Technology in 2005. He is a professor and director of the Research Institute of Southern Petroleum Exploration & Production Company, SINOPEC. His research interests are petroleum geology, basin analysis, and modeling.
Jianming Ma received his Ph.D. from the Chengdu University of Sciences and Technology in 2005. He is a professor and vice manager of Southern Petroleum Exploration & Production Company, SINOPEC. His research interests are petroleum geology and sedimentology.
Shaofu Huang received his Ph.D. from the China University of Geosciences, Beijing, in 2005. He is a senior engineer and former vice director of the Research Institute of Southern Petroleum Exploration & Production Company, SINOPEC. Currently, he works for Gas Company, SINOPEC. His main interests include organic geochemistry, basin evaluation, and petroleum exploration.
Baise Basin, which covers an area of 830 km2 (320 mi2) with a length of 109 km (70 mi) and a width of 7–14 km (4–8 mi) and strikes northwest, is a Paleogene lacustrine-faulted basin. Its formation experienced synrift, regional subsidence, and uplift and erosion. Its Paleogene depositional environments experienced changes from flood-plain or alluvial-fan facies to fluvial facies, delta facies, lacustrine (fan-delta facies), and then fluvial facies, all of which combine to reflect the evolution from individual fault-controlled depocenter through maximum areal development and subsidence and then shrinkage. The Nadu Formation lacustrine mudstones, with thickness ranging from 300 to 600 m (980 to 1970 ft), are the main source rocks. The in-place potential resources in the Baise Basin have been estimated to be 73 x 106 t (540 million bbl) of oil and 77 x 108 m3 (270 bcf) of gas.
Three biodegraded oil pools, seven oil fields, and five gas pools have been discovered. Oil and gas pools are characterized by thin reservoirs, small area distributions, and shallow burial depth and can be classified into three types: structural, stratigraphic, and combined structural stratigraphic. The proven reserves of oil total 123 x 105 t (91 million bbl), and those of gas total 7.7 x 108 m3 (27 bcf). The ratio of proven oil reserves to in-place potential oil resource is about 16.9%, suggesting that the basin still has considerable potential for oil exploration. Reservoirs deeper than 2000 m (6500 ft) in stratigraphic and subtle traps have a major potential for exploration and are the favorable targets of the future.
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