Method of predicting the water abundance of limestone based on AVO technique and pseudo Poisson’s ratio attribute

In order to get water abundance of limestone in Yangdong Mine,firstly,the drilling data and logging data in Yangdong mine were analyzed,which indicates that there is reflection wave at the interface between limestone strata and thin coal strata in the study area. With the help of logging data,the authors established a geophysical model that is comply with Yangdong Mine. Subsequently,AVO forward modeling were carried out with fluid substitution methods and Shuey’ s approximation equation. Results show that the pseudo Poisson’ s ratio attribute value of limestone’ s roof changes a little, when water abundance of the limestone is low; the pseudo Poisson ’ s ratio attribute value of limestone’s roof increases sharply,when water abundance of the limestone is high. For Yangdong Mine,the value of pseudo Poisson’s ratio attribute in the region that has high water abundance is high,and the value of pseudo Poisson’ s ratio attribute in the region that has low water abundance is low. Finally,AVO inversion for 3D seismic data in Yang-dong mine were performed to make prediction of water abundance on Fuqing limestone karst aquifer and Daqing lime-stone karst aquifer in Yangdong Mine as using pseudo Poisson’s ratio attribute.