建立水平井及大斜度井中声波测井的数值模型，开发三维有限差分和有限元模拟软件，对偏心源的波场特征进行数值模拟分析，研究水平井及大斜度井中偏心源的影响及新型声波探测系设计，改造现有的声波测井物理实验系统，建立水平井及大斜度井偏心源声波测井方法的理论和实验基础,在实验室实现缩比的水平井偏心源声系测量，验证理论研究和数值模拟结果的有效性。在这些理论模拟和实验室研究的基础上，透彻地理解偏心源条件下各模式波在井眼和随钻环境中波场的分布和传播规律,开发水平井及大斜度井偏心源声波测井模式波波形提取算法、地层纵横波速度反演算法及反射波提取成像算法，建立高效的水平井及大斜度井中偏心源声波测井资料处理解释流程，并为现场仪器设计提供技术指导。研究成果将为我国随钻测井地层评价、地质导向钻井、非常规低渗油气储层压裂施工等勘探开发的国际前沿技术建立理论和实验基础，为我国非常规油气藏尤其是页岩气的勘探开发提供新技术手段。

Set up numerical model of 3-D FDTD and FEM for acoustic logging in horizontal and high angle deviated wells. Develop modeling software to simulate the acoustic well logging responses to the wave fields generated by off-center source. Design acoustic probing system with off-center source in horizontal and high angle deviated well. Optimize existing lab system to perform the corresponding experiments with scaled borehole and logging tool to verify the applicability of the new probing system and the numerical modeling results. Based on these studies, we can thoroughly understand the wave field characteristic and distribution of the sonic logging with off-centered source in horizontal and high angle deviated well, and hence develop the algorithms for waveform processing, formation P and S wave velocity inversion, reflection wave imaging and finally build up an efficient data processing flow. These studies also provide the guidance for the new acoustic tool design. The outputs of this research project will lay the theoretical and experimental foundations for our LWD formation evaluation, geo-steering and hydraulic fracturing technologies in development of unconventional resources and eventually result in a new means for exploration and development of unconventional resources like shale gas reservoirs.