Acoustic reflection imaging in deep water wells is a new application scope for offshore hydrocarbon exploration. Two-dimensional (2D) geological structure images can be obtained away from a one-dimensional (1D) borehole using single-well acoustic reflection imaging. Based on the directivity of dipole source and four-component dipole data, one can achieve the azimuth detection and the three-dimensional (3D) structural information around the wellbore can be obtained. We first perform matrix rotation on the field four-component data. Then, a series of processing steps are applied to the rotated dipole data to obtain the reflector image. According to the above dipole shear-wave imaging principle, we used four-component cross-dipole logging data from a deviated well in the South China Sea to image geological structures within 50 m of a deviated well, which can delineate the structural configuration and determine its orientation. The configuration of near-borehole bedding boundaries and fault structures from shear-wave imaging results agrees with those from the Inline and Xline seismic profiles of the study area. In addition, the configuration and orientation of the fault structure images are consistent with regional stress maps and the results of the borehole stress anisotropy analysis. Furthermore, the dip azimuth of the bedding boundary images was determined using borehole wall resistivity data. Results of this study indicate that integrating borehole acoustic reflection with seismic imaging not only fi lls the gap between the two measurement scales but also accurately delineates geological structures in the borehole vicinity.

中文翻译：

---

四分量偶极剪切反射成像在偏井周围地质构造解释中的应用

深水井声反射成像是海上油气勘探的新应用范围。使用单井声反射成像可以从一维（1D）钻孔中获取二维（2D）地质结构图像。基于偶极子源的方向性和四分量偶极子数据，可以实现方位角检测，并且可以获得井眼周围的三维（3D）结构信息。我们首先对现场的四分量数据执行矩阵旋转。然后，将一系列处理步骤应用于旋转的偶极子数据以获得反射器图像。根据上述偶极子横波成像原理，我们使用了南海某偏斜井的四分量交叉偶极测井数据对偏斜井50 m内的地质结构进行成像，可以描绘出结构配置并确定其方向。剪切波成像结果显示的近钻孔层理边界和断层结构的构造与研究区域的Inline和Xline地震剖面的构造一致。此外，断层构造图像的构造和方向与区域应力图和井眼应力各向异性分析的结果一致。此外，利用井壁电阻率数据确定了层理边界图像的倾角。这项研究的结果表明，将井壁声反射与地震成像相结合，不仅可以填补两个测量尺度之间的空白，而且可以准确地描绘井壁附近的地质结构。