江苏油田MQ火山岩油藏开发技术政策研究

火山岩油藏是一种与沉积岩油藏完全不同的特殊类型油藏,储渗机理较沉积岩油藏更为复杂,因而在开发过程中有其独特的生产特征,所采用的开发技术政策也与砂岩油藏有所不同。对江苏油田MQ火山岩油藏的开发技术政策研究表明,油井有效位置是影响开发指标和经济效益的重要因素,开采初期应采用井距为900m稀井网控制构造高点和孔洞缝发育带,中后期可适当将井距调整为500m。合理注水方式为低部位或边缘注水,最佳注水压力水平为0.45～0.65。油井射孔井段尽量在油水界面之上30m,注水井应避射沉积夹层,注水井注入压力应低于沉积夹层进水的临界压力。

Development technique of MQ volcanic oil reservoir in Jiangsu oilfield

Volcanic oil reservoir is a special type oil reservoir, which is completely different from those in sedimentary rocks.Its reservoiring and permeating mechanism is more complex than sedimentary reservoir.It has,therefore,particular production feature and development technique.According to the study of development technique of MQ volcanic oil reservoir in Jiangsu oilfield,effective location of oil well is the key factor affecting development index and economic benefit.In the early stage of development,wide spacing (well spacing of 900m) should be adopted to control the structural high and the zone where pores,fissures and vugs are well developed;and in the middle and later stage,well spacing can be adjusted to 500m.Reasonable injection pattern is that water should be injected in the lower position or edge of reservoir.The optimum injection pressure coefficient is 0.45-0.65.The perforated interval in the well is better to be placed 30m above the oil-water contact.Water injection well should avoid to perforate the sedimentary intercalated bed,and the injection pressure should be lower than the critical pressure of water entering the intercalated bed.