APPLICATION OF STATISTIC METHODS IN PETROLEUM RESOURCES QUANTITATIVE ASSESSMENT IN THE QIANJIANG SAG, THE JIANGHAN BASIN

Based on the distribution characteristics of proven oil field reserves size and the changing trend of oil yield and discovery rate per exploration well over the years in the Qianjiang Sag,the Jianghan Basin,three different kinds of statistic methods such as pool size sequence,Weng's life cycle and exploration benefit method have been chosen in the paper.On the foundation of analyzing mathematical principle,mathematical model,parameter feature and application condition,petroleum resources in the Qianjiang Sag are estimated from different angles.The study shows that the amount of petroleum resources in the Qianjiang Sag is about 16 535.2×10⁴ t.Though the exploration degree of petroleum resources is high at present,there still remains some resource potential.The amount of unproven resources is about 5 202.2×10⁴ t,which will provide geological basis for oil and gas exploration plan and medium and long-term development goal.