摘要:
微地震监测技术是对低渗透储层压裂效果评价和指导油藏精细注水开发的重要手段.通过观测、分析由压裂产生的微小地震事件,能够获取压裂裂缝的位置、大小、导流能力、几何形态及局部裂缝分布规律等诸多信息.姬塬油田王盘山长8油藏具有低孔、低渗、低压特征,常规压裂生产一段时间后减产很快;近年来开展了混合水体积压裂并实施了微地震监测.芦58-54井监测混合水体积压裂结果显示:产生的缝长达到315.97m,缝宽104m,缝高约58 m,影响体积约244.8万m3,方位北偏东19.5°;压裂使储层裂缝开启,泄油半径增大,单井产油量增加,效果非常明显.为该油藏进一步精细开发打下了坚实基础.
Abstract:
Micro-seismic monitoring technology is an important means to evaluate the fracturing effect of low permeability reservoir and to guide the development of fine water injection in oil reservoir.Through the observation and analysis of micro-seismic events produced by fracturing,the location,size,flow conductivity,geometric shape and local fracture distribution regularity of fractures can be obtained.Wangpanshan Chang 8 reservoir of the Jiyuan oilfield is characterized by low porosity,low permeability and low voltage,and hence production will decrease soon after the conventional fracturing production is conducted for a period.In recent years researchers have carried out mixed water volume fracturing and implemented the micro-seismic monitoring.The monitoring of Lu 58-54 well mixed water volume fracturing results shows that the long slit produced is up to 315.97 m,the seam width is 104 m,the fracture height is about 58 m,the affected volume is about 24.48 million m3,and the direction is NE 19.5°.The fracturing has caused the reservoir layer cracks to open and drainage radius to increase,thus increasing the amount of single well production.The effect is very obvious,and the results obtained by the authors lay a solid foundation for further fine development of the reservoir.
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