光纤微地震检测技术在压裂效果评价中的应用

Application of Optical Fiber Micro-seismic Detection Technology in Fracturing Effect Evaluation

微地震压裂实时检测是辅助了解压裂效果和优化压裂工艺的一项重要手段。与电子式检波器相比,光纤式检波器信噪比更高,在较高温环境下工作稳定性更好,更有利于分析微震事件出现的空间展布;计算裂缝网络方位、长度、宽度、高度,并结合地震剖面构造和岩性特征,可解释裂缝的连通性;在微地震事件发生较多的井段,产气贡献率与微地震事件存在一定正相关关系,为优化压裂方案提供了数据支撑。

Real-time detection of microseismic fracturing is an important means to understand the fracturing effect and optimize the fracturing process.Compared with electronic geophone,optical fiber geophone has higher signal-to-noise ratio,better working stability in higher temperature environment,and is more conducive to analyzing the spatial distribution of microseismic events.By calculating the azimuth,length,width and height of the fracture network,and combining the seismic profile structure and lithological characteristics,the fracture connectivity can be explained.In the well sections with more micro-seismic events,there is a positive correlation between gas production contribution rate and micro-seismic events,which provides data support for the optimization of fracturing schemes.