Method and advance of shale gas formation evaluation by means of well logging

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 identification 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. Recently, 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.