江汉蚌湖含油系统油气分布及潜力

Distribution of Hydrocarbons from Banghu Petroleum System and Prospecting Potential of Jianghan Basin

汪仕忠,郭淑霞

Wang Shizhong , Guo Shuxia

江汉油田分公司

Jianghan Oilfield Company , SINOPEC, Hubei 434102 , P. R. China

Banghu syncline in the Qianjiang sag is a depocenter of Paleogene Qianjiang Formation , and is the richest hydrocarbon generation center in Jianghan Basin. The Banghu petroleum system has clear boundaries , and high degree of prospecting within 470 km2 studied area ,having an exploration well density up to 1. 104 well per km2 . There have been 13 oilfields discovered in the syncline , including Wangchang , Zhongshi , Guanghua Oilfields etc. . The proven OOIP of the Banghu syncline is 6 848x104 t ,accounting for 59.7 %of that of the J ianghan Basin. The Banghu petroleum system is divided into Guanghua , Wangchang and West - Slope blocks ,based on the point of views as following : characters of salt sequences of Qianjiang Formation , Source Control Theory about non - marine oil basin , hydrocarbons migrating radially towards the oil - generation sag margins. Analysis of oil and gas prospecting potential for these blocks is on the basis of oil and gas distribution , degree of prospecting of each block , current knowledge and block anologue empirical prediction derived from geological correlations. Potential prediction is made on the basis of the Guanghua block , having the highest degree of prospecting , analogy between Wangchang and Guanghua blocks , analogy between West - Slope and Wangchang blocks. The analysis conclusion is that the expected value of possibly proven remaining OOIP of Banghu sag is 24. 94-39. 77 million tons , and the median of that is 32.35million tons.