济阳坳陷三维地震资料中亮点气藏的特征及识别方法

济阳坳陷上第三系地层中，地震波在砂岩中传播速度低于围岩，含气砂体在地震剖面上表现变亮点的反射特征，利用二维地震资料识别气藏已取得成功。三维地震资料比二维资料具有更大的优越，滤波后的三维纯波带资料突出了气藏亮点的反射特征，减少了假亮点造成的错觉，大大提高了气藏的识别能力。本方法已在济阳坳陷的浅层天然气勘探中应用。实践证明其效果良好。

The feature and the recognition of gas bright spot in the 3-D seismic data of Jiyang Depression

In the Neogene system formations of Jiyang, the interval velocity in sandstone is slow compared with that in wall rock,and gas-bearing beds exhibit the renection feature of bright spot,to recognize gas bright spots with 2-D seismic data has been successful. It is well known that 3-D seismic data are much better than 2-D seismic data,and it is found that with the use of flltcred 3-D pure wave data the renection fearure of bright spot is more outstanding.So the misunderstandingdecreases and the success rate of recognizing gas-bearing beds greatly increases. This method has proved to be very good in its application for shallow gas exploration in Jiyang Depression.