川东飞仙关组鲕滩储层地震响应特征及预测

川东下三叠统飞仙关组鲕滩气藏是川东地区的重要气藏类型之一，“亮点”型反射特征识别鲕滩储层在研究区内成功率较高，但失败的钻井也不少。为了更有效地进行鲕滩储层的预测，结合区内多口成功和失败钻井，从测井、地震反射特征、地震层序等方面进行了分析，指出“亮点”型反射具有多解性和不确定性。通过对钻遇的含气鲕粒岩储层成岩环境的分析，得到了2点认识：①鲕滩白云岩化是其成为有效储层的必要条件；②鲕滩沉积时近于暴露的古地理环境为其白云岩化提供了条件。此外，还利用地震地层学和层序地层学来识别古沉积环境，以排除无效“亮点”。

Seismic response feature and prediction of oolitic beach reservoir of Feixianguan Formation in east Sichuan basia

The lower Triassic Feixianguan Formation is one of the most prolific carbonate reservoirs in east Sichuan basin producing hydrocarbons from the oolitic beach rocks,"light spot"has been successfully used to predict reservoirs, but there are also some failure cases. In order to predict the reservoir effectively, some drilled boreholes are analyzed from well logging , crossing well seismic profile response pattern and seismic sequence. The analysis results show that there are some uncertainties of this method. By analyzing the sedimentary facies of gas bearing oolitic rocks, we conclude that dolomization is necessary to the effective olli-tic beach reservoir, and palaeogeographical high provides the condition to dolomization. Seismic stratigraphy and sequence stratigraphy are useful methods to identify palae-osedimental setting and remove inefficient "light spot".