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西非深水地区特殊的地理环境和复杂的合同财税条款,决定了勘探开发的高风险、高投入和高难度,其经济界限既不同于国内,也不同于浅海和陆上。到目前为止,未曾见到针对该地区油气田勘探开发经济界限方面的公开研究成果。根据长期从事海外油气田评价的实际经验和相关理论,对该地区油田开发经济界限可采储量和产量评价进行了探索研究。通过对经济评价指标进行筛选和确定,结合贴现现金流法,对经济因素影响最大的油价、开发投资等敏感性参数进行分析,得出一系列图版。同时,对尼日利亚地区目标油田的不同年产规模和不同井数条件下的经济界限产量和可采储量进行评价。研究结果表明,无论在不同年产规模还是不同井数情况下,经济界限可采储量和产量与油价均呈反比关系,与投资变化均呈线性增长关系。同时,在考虑财税政策下,要回收开发投资、操作费用和弃置费用等,西非深水油田经济界限产量、经济界限可采储量至少要在800×104m3/a和5000×104m3以上,若采出程度为40%,油田经济界限动用地质储量、经济单井动用储量要在1.3×108m3和350×104m3以上。
The special geographical environment and complicated contract taxation provisions in the deep-water region of West Africa determine the high-risk, high-investment and high-difficulty exploration and development. The economic limits of the project are different from those of the domestic and other shallow seas and land. To date, no public research has been made on the economic boundaries of oil and gas field exploration and development in the area. Based on the practical experience and relevant theories of long-term overseas oil and gas field evaluation, this paper explores the recoverable reserves and output evaluation of the economic development of oilfields in this area. Through the screening and determination of the economic evaluation index, combined with the discounted cash flow method, the most influential economic factors such as oil prices, development and investment and other sensitivity parameters to analyze, come to a series of plates. At the same time, we evaluate the economic boundary production and recoverable reserves under the different annual production scale and different well number of the target oilfields in Nigeria. The results show that the recoverable reserves, output and oil prices are inversely proportional to the economic boundaries and show a linear growth relationship with the changes in investment, irrespective of the annual yield or the number of wells. At the same time, under the fiscal and taxation policies, to reclaim development and investment, operating costs and disposal costs, the economic output and economic recoverable reserves of the deep-water oil fields in West Africa should be at least 800 × 104m3 / a and 5000 × 104m3, respectively. If the degree of recovery Is 40%. The economic reserves of the oilfields use the geological reserves, and the economic reserves for single well use should be above 1.3 × 108m3 and 350 × 104m3.