Since 2000, three bigger petroleum companies in China have listed in NYSE (New York Stock Exchange ) in succession. According to SEC (Securities and Exchange Commission) rules and requirements, all quoted oil companies in the U. S. A should implement reserves estimation and disclose their information. As a listed company, it's very important part to carry out the above task for its reserves management. Static and dynamic methods are usually used in reserves estimation; for the developed reserves estimation, decline curve analyzing method is often adopted, the key of the above is to determine scientifically and reasonably the decline rate. With the help of the dynamic production performance data of the oilfield, the decline relation between the monthly and average individual well's productions and time are researched in detail. The results show that for the whole development process, the declining rate of the average individual well's production is generally more than the that of monthly production. In fact, the proper usage of estimating methods and optimal choice of the decline types can increase reserves and moreover provide important guiding significance for the conduct of reserves estimation%自2000年以来,中国三大石油公司相继在纽约证券交易所上市,美国证券交易委员会(SEC)规定,凡是在美国上市的石油公司,必须按照规定的准则和要求进行储量评估及信息披露.作为上市石油公司,根据SEC准则进行油气储量评估及对外披露工作已成为储量管理的重要内容.油气储量评估常用方法有静态法和动态法两种,已开发储量评估常用的是递减曲线分析法,关键是科学合理的确定递减率.为此,通过油田实际生产开发动态资料,详细研究月产量和平均单井产量与时间递减关系,重点表明在油田整个开发过程中平均单井产量递减率总体上大于月产量递减率.实际应用时采取合理评估方法和递减类型,可以提高已开发储量评价精度,对今后储量评估工作的开展具有重要指导意义.
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