Rock Physics Analysis Technology on Shale Gas Reservoir Sweet Prediction In South of China

China is rich in shale gas reservoir, and has bright prospect in this area; however, the terrain where the shale gas reservoir located is complicated and the formation is changeable, which makes the exploration difficult. Therefore , It is very essential to find out shale gas reservoir favorable area and conduct further research on the sweet prediction technology for the breakthrough of shale gas reservoir exploration in China. At present, the critical factors of shale gas sweet prediction are mainly TOC prediction and brittle prediction, which normally have close relations with rock physics analysis. In the study, we divide rock physics analysis into log curve correction and inversion, rock physics perturbation analysis and favorable elastic parameter crossplot. Through this way, to find out the relative sensitive parameters to the elastic parameter variation and TOC and brittleness properties; and to form TOC and brittleness horizontal distribution regular patterns with the seismic inversion technology; finally to achieve shale gas favorable area prediction by combining seismic and logging with synthetic gathers and AVA analysis. With the actual shale gas exploration and research data in south China, we have a preliminary analysis and study on the status of rock physics technology application on shale gas sweet prediction, and provide a train of thought for the related study in this field. Through our research, we, for the first time, apply effectively the shale gas log curve correction and inversion prediction, rock physics perturbation analysis, favorable elastic parameter crossplot technologies to the actual shale gas exploration in south of China and form effective research methods. The research is significant in the way of providing important reference basis for shale gas reservoir sweet prediction.