微地震监测技术在吐哈油田西山窑油藏蓄能压裂中的应用

西山窑油藏低孔特低渗储层开发过程中产能低、稳产差,采用大液量施工、补充地层能量、提高地层压力的蓄能压裂工艺方法,以达到扩大储层改造体积、增加流体渗流通道的目的;同时加入暂堵剂对天然裂缝及人工裂缝进行暂堵,迫使裂缝转向,避免单一主裂缝沿高渗通道延伸。蓄能压裂工艺方法是致密油储层改造的新探索,需要准确的压裂效果评价技术,微地震监测技术被广泛用于致密油气储层改造效果评价,具有实时性、准确性的特点,可以评价蓄能压裂工艺改造效果。对致密油储层三口井压裂微地震监测实例进行分析研究表明,微地震监测可以有效识别压裂中天然裂缝影响、评价蓄能压裂工艺储层改造以及暂堵转向工艺效果。

Application of micro-seismic monitoring technology in energy storage fracturing in Xishanyao reservoir of Tuha oilfield

During the development of low porosity and ultra-low permeability reservoirs in Xishanyao reservoir,the productivity is low and the stable production is poor.In order to expand the reservoir reconstruction volume and increase the fluid seepage channel,the energy storage fracturing technology is used to increase the formation energy and increase the formation pressure.At the same time,the temporary plugging agent is added to block the natural and artificial fractures to force the fracture to turn and avoid the single main fracture extending along the high permeability channel.Energy storage fracturing technology is a new exploration of tight oil reservoir reconstruction,which needs accurate fracturing effect evaluation technology.Micro-seismic monitoring technology is widely used in tight oil and gas reservoir reconstruction effect evaluation,which has the characteristics of real-time accuracy,and can evaluate the effect of energy storage fracturing technology.The micro-seismic monitoring examples of three wells in tight oil reservoir show that the micro-seismic monitoring can effectively identify the influence of natural fractures in fracturing,evaluate the reservoir reconstruction of energy storage fracturing technology and improve the effect of temporary plugging and diversion.