海上边水薄层稠油油藏天然能量分区

Natural Energy Partition in Offshore Thin Heavy Oil Reservoirs With Edge Water

中国南海东部E稠油油藏油层薄,构造平缓,含油面积大,以边水驱动为主,存在区域能量供应不足问题,产能难以满足高速开发的需要,亟待调整开发方式。通过数值模拟主控因素对油井生产动态和油藏压力的影响,拟合天然能量供应充足时,油井到边水的极限距离,确定能量充足区和能量不足区;通过主控因素和灰色关联分析,建立不同水体倍数下的天然能量分区界限图版。研究结果表明,储集层渗透率越大,原油流度越高,油层厚度越大,水体倍数越大及采液速度越低,能量充足区范围则越大;E油藏天然能量分区界线即油井到边水的极限距离为922 m,与区域油井实际生产动态相符,说明该图版可靠,可供同类型油藏开发借鉴。

The E heavy oil reservoir with edge water in eastern South China Sea has thin pay zones,gentle structures and a large oil⁃bearing area.The regional energy is insufficient and the production capacity can’t support oilfield development at a high rate,so it is urgent to up⁃date the development model.Numerical simulation was carried out on the influence of controlling factors on oil well performance and reser⁃voir pressure,and the extreme distance from an oil well to the edge water was estimated when natural energy supply is sufficient,then the zones with sufficient energy and insufficient energy were determined,and finally natural energy partition charts for different water multiples were established after analyzing the controlling factors and grey correlation.The research results indicate that:(1)The higher the reservoir permeability,the higher the oil mobility,the thicker the pay zone,the greater the water multiples and the lower the fluid recovery rate,and the larger the sufficient energy zone range;(2)The natural energy boundary in the E reservoir,namely the extreme distance between an oil well and the edge water,is 922 m,which is consistent with the regional production performance.The findings above have proved that the charts are reliable and can be a reference to developing similar oil reservoirs.