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在油田注水生产过程中,地下储层注水前缘空间三维形态的识别监测技术对注水评估显得越来越重要。目前,国外常用的方法是在压裂井周边的观察井中放置地震检波器串,接受得到注水期间信噪比高的微地震信号,通过每个地下破裂事件的产生震源点到检波器点的微地震波旅行初至时间,确定地下储层产生微地震震源点的空间位置。微破裂向量扫描注水前缘监测技术是在近地表布置多套微地震波三分量信号采集站形成仪器阵列系统,运用多道集(至少360个检波器)共同接受地下岩石破裂所产生的微地震纵波和横波,利用地下空间体地震波速度模型及地震波信号传播路径射线追踪,进行微地震波场的向量叠加和微地震波振幅反演计算,并通过分析微地震波振幅(即能量)属性在时间域和三维空间的相关性,可视化解释注水前缘的空间形态和演变发育过程。从而对注水生产进行科学、合理、客观的评估。
In the field of oilfield waterflooding, the identification and monitoring technology of the three-dimensional shape of the injection front of underground reservoirs is becoming more and more important for waterflooding assessment. At present, the commonly used method abroad is to place the geophone string in the observation well around the fracturing well and receive the microseismic signal with high signal-to-noise ratio during water injection. Through the micro-seismic signal from the origin point to the geophone point of each underground rupture event The first arrival time of the seismic wave travel determines the spatial position of the microseismic source point in the underground reservoir. Micro-Burst Vector Scanning The waterfront monitoring technique is to arrange multiple sets of micro-seismic three-component signal acquisition stations near the surface to form an instrument array system. Multi-trace sets (at least 360 detectors) jointly accept microseismic longitudinal waves generated by underground rock fractures And shear wave, using the velocity model of the underground space body and the ray tracing of the seismic signal propagation path, the vector superposition and the micro-seismic amplitude inversion calculation of the micro-seismic wave field are performed. By analyzing the amplitude and energy properties of the micro-seismic wave in the time domain and the three-dimensional space The relationship between water injection front visualization and the evolution of the spatial morphology of the development process. Water injection production in order to conduct a scientific, rational and objective assessment.