新增探明储量的经济规模界限计算方法

Economic Scale Boundary Calculation Method for New Found Proved Reserves

提出了新增探明储量的经济规模界限概念和计算方法。根据盈亏平衡原理建立了新增探明储量的经济可采储量界限计算模型,制作了不同类型油藏、不同油价、不同井深条件下计算经济可采储量界限的图版;根据储层的空气渗透率,利用已开发油田技术可采储量经济转化率与油藏空气渗透率的相关关系式和图版,求取新增探明储量的经济转化率,进而计算出新增探明储量的技术可采储量界限和经济规模界限。计算过程中用了井深、空气渗透率、采收率和经济转化率等指标,体现了油藏的地质条件和储层的品位,更加符合油田实际,对判别新增探明储量和未开发储量的经济开采价值具有重要意义。

Concept and calculation method of economic scale boun dary of new found proved reserves is provided. Based on profit and loss theory, a model on economic reserve boundary of new found proved reserves is built, as w ell as series of corresponding charts, which take consideration of various reser ve types, oil prices, and well depths, are drawn. Using the known relationship f ormula and charts of technical recovery reserve's economic conversion ratio of d eveloped oilfields and reserve air permeability, new proved found reserve's econ omic conversion ratio can be figured out with given reserve air permeability; fu rthermore, the new found proved reserve's technical recovery reserve boundary an d economic scale boundary can be calculated. Indexes in the given method, such a s well depth, air permeability, recovery ratio and economic conversion ratio, et c, are in high extent reflect the reserve's geological condition and quality gra de. The method can largely fit into practical oilfield development and have impo rtant meaning to evaluate the economic characters of new found proved reserves a nd undeveloped reserves.