摘要
微地震监测技术通过接收储层压裂改造时岩石破裂的震源信号获取破裂点的空间位置,但是如何基于监测结果刻画裂缝的空间展布形态则是微地震解释面临的一个技术难题。为此,首先研究了基于时距交会分析的无效压裂事件识别和基于“点缝”连接准则的裂缝网络构建技术,在此基础上建立了裂缝网络构建技术流程,并利用某压裂段的监测资料进行了方法测试,最后,利用该方法对某工区压裂井进行了裂缝网络构建,并结合地层属性特征对压裂改造效果进行了评价。最终形成了压裂改造裂缝网络构建技术,建立了微地震定位结果与裂缝网络之间的桥梁,通过无效事件识别,提高了裂缝网络的合理性。四川盆地某微地震地面监测资料裂缝网络构建应用结果表明,利用压裂改造裂缝网络构建技术所构建的裂缝网络能够直观展示裂缝空间展布形态及其复杂度,揭示裂缝生长发育过程,为结合储层特征进行压裂改造效果评价提供了可靠依据。
By processing microseismic monitoring data recorded during hydraulic fracturing it is possible to obtain information on the spatial distribution of fractures.However,the characterization of the fracture network from microseismic events remains a difficult technical task.To address this issue,we presented a time-distance cross-plotting analysis method for the identification of invalid events,and a method based on the“dot to network”connection criterion to build the fracture network.On the basis of these methods,a procedure for building the fracture network was established and tested using fracture data.Subsequently,the method was applied to a real case in the Sichuan basin,taking data from an entire well with horizontal fractures,and utilized to evaluate the effect of fracturing.The results indicated that the proposed method was able to identify the spatial distribution of fractures and its complexity,and could also reveal the fracture growth process,thereby providing a reliable basis for evaluating the effects of fracturing.
作者
杨小慧
林正良
丁圣
杨心超
余波
YANG Xiaohui;LIN Zhengliang;DING Sheng;YANG Xinchao;YU Bo(Sinopec Geophysical Research Institute,Nanjing 211103,China)
出处
《石油物探》
EI
CSCD
北大核心
2019年第6期920-925,934,共7页
Geophysical Prospecting For Petroleum
基金
国家科技重大专项“页岩储层压裂微地震监测技术研究”(2017ZX05036-005-010)资助~~
关键词
微地震监测
微地震解释
无效压裂事件识别
裂缝网络构建
裂缝发育过程
压裂改造效果评价
microseismic monitoring
microseismic interpretation
invalid event recognition
fracture network construction
fracture growth process
evaluation of fracturing effect
