Formation evaluation with well logging for shale gas are mainly in: (1) Interpretation of lithology and reservoir parameters such as porosity, saturation, and permeability, etc. (2)Source rock detection which may involve kerogen identifcation and classification,evaluation of TOC or organic maturity. (3) Evaluation of mechanical parameters and fracture identification. Especially in the early stage of exploration, well logging could be a crucial way for geologists to observe some potential targets. Recendy, new advances on well logging application in shale gas are relevant to ECS and FMI. A new research also demonstrates that the negative abnormal in X-signal measurement on account of dielectric permittivity might be a very useful indication for some specific kerogen.%页岩气测井地层评价主要围绕3个方面展开:①页岩气地层的岩性和储集参数评价,包括孔隙度、饱和度、渗透率等;②页岩的生烃潜力评价,主要包括干酪根的识别与类型划分、有机质含量、热成熟度等一系列指标的定性或定量解释;③岩石力学参数和裂缝发育指标的评价.特别是在资源调查和勘探的初期,如何从烃源岩中寻找最有利的页岩气藏富集,是地球物理测井的首要任务.近几年,国外在页岩气测井评价方面的工作主要体现在对ECS测井和高分辨率成像测井的应用.另外有研究表明,感应测井与岩石介电常数有关的X分量负异常与干酪根的存在及其类型之间有一定的相关性.
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