川东石炭系自1977年冬钻获天然气以来已为区域产气层。该层是界于两个侵蚀面之间的碳酸盐岩残层,厚度薄,变化大,时有时无,致使钻前预测其厚薄或有无均感困难。自1979年以来应用地震振幅比值法探求其厚度,经两年多来32口井的钻探实践,对比符合率达93.8％,其方法对预测薄层厚度具有现实意义。 The Chuandong Carboniferous has been the regional gas-bearing layer since the natural gas was drilled in the winter of 1977. This layer is a carbonate residual layer between the two eroded surfaces. The thickness is thin, varies widely and sometimes, resulting in difficulties in predicting the thickness of the pre-drill or whether it is homogeneous or not. Since 1979, the seismic amplitude ratio method has been used to explore its thickness. After drilling for more than two years in more than two years, the comparison coincidence rate reaches 93.8%. The method is of practical significance for the prediction of thin-layer thickness.