随钻方位电磁波测井多参数快速反演

大斜度井/水平井随钻测井技术已被广泛的应用于各种复杂油气藏中，但传统随钻电磁波测井仅提供仪器轴向磁场分量，井斜和各向异性对测井响应影响耦合在一起，难以剥离，无法基于反演同时获取多个参数，进行相应的地层评价，且不能提供方位信息，难以实现地质导向功能.随钻方位电磁波测井在提供仪器轴向磁场分量的基础上，还提供了仪器横向磁场分量，其提取的地质导向信号，对地层界面非常敏感，受井斜、地层电阻率对比度和各向异性影响弱，可以反演得到准确的界面位置.此外，额外的磁场分量信息，有效降低了井斜与各向异性的耦合程度，可基于反演算法实现多参数联合反演，满足电阻率测井精细解释评价需求.

Fast multiple parameter inversion of azimuthal LWD electromagnetic measurement

The Logging While Drilling (LWD) technique has been widely used in high-angle and horizontal wells during exploration of complicated reservoirs. However, the traditional LWD electromagnetic measurement can only provide the longitudinal component of the magnetic field, which is along the axis of the tool. In this case, the relative dip and anisotropy would be easily coupled with each other. It is difficult to separate these parameters from inversion simultaneously. Besides, they lack the azimuthal information and cannot satisfy the requirements of geosteering. While the azimuthal LWD electromagnetic measurement can solve these problems. It can also provide the additional geologic information which is sensitive to the boundary and less sensitive to the relative dip, resistivity contrasts and the anisotropy and so on. Therefore, this method permits to determine the accurate location of the boundary through inversion of measurement data. The additional latitudinal magnetic component could also decrease the coupling degree of the relative dip and the anisotropy, especially in high-angle and horizontal wells. Thus, it is possible to use inversion to obtain the relevant parameters simultaneously to realize the accurate interpretation of resistivity well logging data.