【摘要】 方位反射声波成像测井技术能够接收来自井旁地层不同方向的纵波信号,实现对井旁几十米范围内的地质体方位和到井距离的测量。当井旁地质体尺度明显大于地层中的纵波波长时,利用该地质体产生的反射纵波可以对地质体进行精确成像;当井旁地质体尺度与地层中的纵波波长相当时,则可以利用该地质体产生的散射纵波获得地质体的分布情况。方位远探测声波测井仪器装配了10个八单元声波接收站,每个接收站由沿圆周均匀分布的8个压电型接收振子构成,可以获得多个源距、不同方位的声波数据。介绍了方位反射声波成像测井技术及2个应用案例,并将声波相控阵技术应用于方位声波测井资料处理中,以提高井旁地质体方位测量的准确度。针对过井裂缝和相邻井的方位反射声波成像测井测量实例,验证了利用该测井方法评价井旁地质体空间位置时的可靠性。更多还原

【Abstract】 The directional reflected P-waves from the near-borehole geologic reflector are recorded by the borehole azimuthal acoustic reflection imaging logging. Therefore, the geologic reflector location represented by the reflector azimuth and the distance from the borehole, within a range for tens of meters, can be detected by this method. If the size of the reflector is significantly larger than P-wave wavelength in the formation, the reflected P-wave can be used to accurately image the geologic reflector. If the size and the wavelength are of equal magnitude, the scattered P-wave can be used to evaluate the reflector. The supporting borehole azimuthal acoustic reflection tool is equipped with 10 unique azimuthal receivers. A single azimuthal receiver is composed of eight sensors evenly distributed along the circumference of the tool, which ensures that azimuthal reflected or scattered P-waves can be effectively received. The beamforming method is also applied to the data processing for enhancing the directional reflections, resulting in an accurate azimuth of the geologic reflector. Field cases of evaluation for the fracture and the target borehole are introduced. The results show that the high-performance evaluation of the near-borehole geologic reflector using the borehole azimuthal acoustic reflection imaging logging.更多还原