Effect Analysis of Secondary Sand Fracturing Using Four-Dimensional Seismic Imaging of Micro-Fractures
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摘要: 在水力加砂压裂中,目前常用获取压裂裂缝几何形态和几何参数信息的手段(如井温测井、阵列声波测井)存在不足,为此,试验应用了微破裂向量扫描四维影像监测技术。该技术通过在近地表按不同排列形式布置多道地震采集站形成的微地震仪器阵列,共同接收地下储层液体流动压力引起的岩石微破裂所产生的纵波和横波,检波器接收到信号后通过能量转换器将振动波转换成电信号,经前置放大后以电磁波的形式,发射送入记录、分析系统,利用多波三分量地震数据进行矢量叠加、振幅反演计算、四维相关可视化裂缝形态解释技术,在时间域上分析裂缝的演变过程。在二连盆地兰地1井的现场试验表明,该技术可以进行压裂施工全过程破裂能量分析、裂缝产生演变过程分析及裂缝空间形态参数求取,能真实反映二次加砂压裂效果并为下一步的压裂施工设计提供可靠依据。Abstract: Commonly used means to obtain fracture geometry at present such as temperature log and arrayed acoustic log have some deficiencies,four-dimensional vector scanning imaging was tested.During hydraulic fracturing,longitudinal wave and shear wave produced from rock failure are received by micro-seismic instrument array of multi-channel seismic acquisition station in different patterns near the surface.Wave signals received by geophones are then converted into electrical signals through energy converter.After pre-amplification,they are sent to the recording and analysis system in the form of electromagnetic waves.Finally vector stacking of multi-wave three component seismic data,amplitude inversion modeling and four dimension related visual fracture morphology interpretation techniques are used to analyze the evolution of fractures in time domain.Its application in Well Landi 1 of Erlian Basin showed it could be used to analyze the fracturing energy and fracture evolution in whole fracturing process,and to calculate fracture spatial geometry parameters,which reflect the effect of sand fracturing and provide reliable basis for the future fracturing design and operation.
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Keywords:
- hydraulic fracturing /
- sand fracturing /
- fracture azimuth /
- fracture height /
- vector scanning /
- Well Landi 1
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