Characterization of deep geothermal reservoir by the AE reflection method

(a)现场声发射测量：在日本Kakkonda Geberg地区进行了两次现场声发射测量。进行了井下单点/双点测量，记录到了质量满足声发射反射法要求的声发射信号。(b)反射波的检测：提出了从3C声发射信号中识别反射波的理论。通过仿真验证了其性能，并在分析中找到了最佳参数。(c)地下三维结构估计：基于绕射偏移方法，设计了一种对检测到的反射波进行反演的方法。(d)现场数据的分析：在Kakkonda记录的AE信号进行了分析，从整个研究项目的新技术。将估计的地下结构与其他地质信息进行比较，包括测井数据、岩心信息和地面调查。在Kakkonda的AE反射法的反射图像是相当一致的，与其他信息。

(a) Field AE measurement : Two field AE measurement was made at Kakkonda Geothermal area, Japan. Downhole single/double point measurement was carried out and AE signals with sufficient quality for AE reflection method was recorded.(b) Detection of reflected waves : A theory to discriminate reflected waves from 3C AE signals was devised. Its performance was examined by simulations and optimum parameters in analysis was found.(c) Estimation of the 3D subsurface structure : An method for inversion of the detected reflected waves were devised based on deffraction migration method.(d) Analysis of field data : AE signals recorded at Kakkonda was analyzed by the new techniques derived throughout this research project. The estimated subsurface structure was compared with other geological information, including logging data, core information and surface survey. The reflection image in Kakkonda by the AE reflection method was considerably consistent with other information.