小断块边底水油藏层系组合模式

doi:10.11743/ogg20110612

摘要/Abstract

摘要：

复杂小断块边底水油藏大多具有含油带窄、纵向油层多、地层倾角大等特点。受油藏构造形态、储层、隔夹层发育状况的影响,边水与底水的驱动作用复杂,对开发效果影响较大,开发模式难以确定。从隔夹层遮挡能力量化入手,建立相应的数学模型与数值模型;通过油藏数值模拟手段,研究不同隔夹层条件、不同含油带宽度条件下的油藏开发模式。对于隔夹层纵向封挡作用较强、含油带较宽的油藏,逐层开发或细分层系开发,能有效提高油藏采收率。对含油带较窄的油藏要尽量避免越层开采;进行逐层或分层开发,采收率水平将优于其他开发模式。但由于逐层开采会降低采油速度,分层开发会增加投入,因此在含油带较窄的情况下,合层开采更为经济。窄条状油藏,油井距边水越近采收率水平越低,油井要尽可能远离边水。

关键词: 隔夹层, 开发模式, 油藏工程, 数值模拟, 复杂小断块

Abstract:

Small complex fault-block reservoirs with edge and bottom water usually feature in narrow oil-bearing belts,multiple oil layers and large stratigraphic dip and so on.Controlled by structural shape,reservoirs and interbed barrier,the driving mechanisms of edge and bottom water are complicated and have big influences on development effect,making it difficult to determine development mode.We established mathematic and numerical models based on quantification of sealing capacity of interbed barriers.Using numerical simulation,we defined development modes under different conditions of interbed barriers and oil-bearing belt width.For oil reservoirs with strong vertical sealing capacity of interbed barriers and wide oil-bearing belts,layer-by-layer or layer-subdivision production can improve oil recovery.While for oil reservoirs with narrow oil-bearing belts,cross-layer production should be avoided.Oil recovery of layer-by-layer or layer-subdivision production is higher than that of other development modes.However,layer-by-layer production may reduce production rate and separate layer production may increase investment,so commingled production would be more profitable when the oil-bearing belts are narrow.In narrow oil reservoirs,the nearer the producer is to edge water,the lower oil recovery is,so producers should be placed from edge water as far as possible.

Key words: interbed barrier, development mode, reservoir engineering, numerical simulation, small complex fault-block

中图分类号:

TE349

唐建东,金勇. 小断块边底水油藏层系组合模式[J]. 石油与天然气地质, 2011, 32(6): 897-902. doi: 10.11743/ogg20110612 Tang Jiandong,Jin Yong. Development mode optimization for small fault-block reservoirs with edge and bottom water[J]. Oil & Gas Geology, 2011, 32(6): 897-902. doi: 10.11743/ogg20110612

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