未开发石油储量评价及经济分类方法

作者根据已探明未开发石油储量特征,运用开发可行性评价技术,对其在地质评价、工程评价的基础上,预测开发指标,进行综合评价。为使评价结果更可靠、更科学、更完整,在储量经济评价指标分析之后,制定了一套储量经济分类方法,发能更确切地反映储量开发的经济价值。

EVALUATION OF UNDEVELOPED OIL RESERVE AND ECONOMIC CLASSIFICATION

Undeveloped oil reserve in Karamay Oilfield accounts for one-third of the proven oil reserve and is characterized by wide distribution,various reservoir types,complex in-situ condition and low produc-tion.The feasibility of developing this type of reserve is restricted by copious unfavourable factors,but it offers the advantage of economizing exploration cost and utilizing preexisting facilities in the deve-loped area.If a full use of it could be made,it will take an inestimable role in oilfield construction.In present paper,major geological and engineering factors that effect the reserve were analysed by application of development feasibility assessment technique.Based on the assessment of reserve reliabili-ty,water-injection method was selected,reasonable well spacing was determined,development index was predicted,and the economic assessment method of undeveloped oil reserve was proposed.The unde-veloped reserve was then classified as recoverable,hard to recover,unrecoverable and undetermined re-serves.In consideration of the economic effect of post-development,a set of indices(predominantly dy-namic)were optimized to economically classify the undeveloped reserve.The analysis examples have proved the realiability and coincidence of this economic classification and the criteria of the reserve assessment.