济阳坳陷三维地震资料中亮点气藏的特征及识别方法

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

胜利石油管理局物探公司, 东营257100

Geophysical Exploration Company, Shengli Petroleum Administration Burcau, Dongying 257100

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为亮点的反射特征, 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性, 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。

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.