Abstract: To make an active and effective response to the continuously low international oil prices, an economic operation model, called “three costs and four performance zones” model, is established on the basis of using the marginal analysis theories of micro-economics. Three kinds of cost – operational cost, service cost and total cost – are determined according to the sensitive degrees of cost to production. The evaluated targets, such as a single oil or water well, a development unit, a development block, an oil production management zone, an oil production plant, and an oilfield, are classified into four performance zones of high-effective profit-making zone, effective marginal zone, low-effective incremental zone and ineffective operational zone. With the performance divided into different levels and policies implemented for different categories, the oilfield enterprises are guided for cost-effective development so that they can prove their production and economic performance and turn their losses into profits.

Key words: oilfield development, “three costs and four performance zones&rdquo, model, cost-effective, development with economic performance

摘要： 为积极有效地应对持续低迷的国际油价，应用微观经济学的边际分析理论，创新建立了油田企业“三线四区” 经济运行模型；根据成本对产量的敏感程度高低，划分出运行成本、操作成本、完全成本3 条成本线；将油水井单井、 开发单元、开发区块、采油管理区、采油厂、油田等评价对象划分为盈利高效、边际有效、增量低效、运行无效4 个 效益区。开展效益分级，实施分类施策，指导油田企业低成本开发，促进了油田企业的效益生产、减亏盈利。

关键词: 油田开发, 三线四区模型, 低成本, 效益开发