珠江口盆地LFX13-1油田Z37油藏高采收率剖析

珠江口盆地LFX13-1油田Z37油藏储集层为三角洲前缘河口坝反韵律块状砂岩,油藏开采表现出明显刚性水驱特征,具有油井产能高、采油速度高、中高含水期含水上升平缓等特点,预测最终水驱采收率将超过70%。从含水上升率、采油速度和阶段采出程度等方面对Z37油藏的开发效果进行了总体评价。从油藏地质特征、水体能量大小、完善开发井网的过程及方式、反韵律沉积层序优势、特高含水后期隐蔽剩余油的挖潜、高地温场对驱油效率及岩石表面润湿性的改善、大规模采用水平井、高油价的有利因素及众多相关前沿技术的应用诸方面剖析了Z37油藏取得高采收率的主要原因。Z37油藏的成功开采经验可为同类型油藏的开发提供借鉴。图9表2参14

Analysis on the high recovery of Z37 reservoir in LFX13-1 Oilfield, Pearl River Mouth Basin

The pay zone of Z37 reservoir in LFX13-1 Oilfield of Pearl River Mouth Basin is negative sequence massive sandstone from mouth bar of delta front. The development performance was characterized as rigid water-flooding, high productivity, high recovery rate and flat water cut rising-up at middle-high water cut stage. The recovery factor of Z37 reservoir is estimated above 70%. The production performance was evaluated as a whole regarding to water cut rise-up rate, oil recovery rate and periodical oil recovery factor. The main reasons for Z37 reservoir high recovery factor were demonstrated and concluded as refined geological and reservoir study, bottom aquifer size, well-pattern completion procedure and well pattern, the advantage of negative sedimentary sequence, hidden remaining oil catching at high water-cut stage, high in-situ temperature field improving displacement efficiency and rock wettability, horizontal well developing bottom-water reservoir, high crude oil price and application of many new advanced technologies. The success production experience of Z37 reservoir can provide reference for the production of similar reservoirs.