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.