1. State Key Laboratory of Coal Resources and Safe Mining,China University of Mining Technology( Beijing),Beijing　 100083,China; 2. College of Earth Science,Guilin University of Technology,Guilin　 541004,China

为得到羊东矿区灰岩富水性情况,首先分析了矿区内钻井与测井资料,表明研究区内的灰岩与薄煤层界面存在反射波,通过测井资料建立了符合矿区实际的地球物理模型;然后结合流体替换方法以及Shuey近似公式对模型进行了AVO正演模拟。结果表明:在石灰岩含水饱和度低时,石灰岩顶界面伪泊松比属性值变化极小;当石灰岩含水饱和度高时,该界面伪泊松比属性值骤然增大。对羊东矿区而言,伪泊松比属性值在富水性较强的区域呈现高值,在富水性较弱的区域呈现低值;最后对矿区三维地震资料进行AVO反演,并使用伪泊松比属性对矿区内伏青灰岩和大青灰岩岩溶含水层进行富水性预测。

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.

国家青年科学基金资助项目(41402143)；

TIAN Wei,ZOU Guangui,TANG Xiaoming,et al. Method of predicting the water abundance of limestone based on AVO technique and pseudo Poisson’s ratio attribute[J]. Journal of China Coal Society,2017,42(10):2706-2717.