Abstract: On the basis of benefit evaluation of developed oilieldl block and single well in an oil region, it is necessary to make the as-sessment of the whole oil- gas producing benefis in an oil region. The indicators for asesmnent of the existing benefit status include the operation cost, oit production ratio of high-yielding block, oil production ration of high-cost block, marginal well or negative eficienl well ratio, break-even oil price -decision oil price ratio. Description and analysis of benefit status出well as prediction of benefil prospect in an oil region are made by using these 5 indicators. Results show that these methods can be well applied to comprehensively systenatically reflect the benefit status of an oil region.

Key words: oil-gas region, cost, breakeven analysis, benefit, assessment