济阳坳陷岩性油气藏地震采集技术

济阳坳陷岩性油气藏存在砂体内部及层间地震反射弱，资料分辨率低的问题。通过较小炮检距、较小面元、较宽方位角、较大非纵距和较高的纵、横向覆盖次数等面元属性的优化组合，提高了该区地震资料的分辨率;建立了表层条件“特征网”，通过寻找表层变化“突变带”，可为最佳激发因素的选取提供可靠依据;总结了频谱分析的有效方法，提出要以砂体解释的需要为目标，避免陷入盲目追求高频率的误区。以上技术与方法在济阳坳陷官7地区岩性油气藏地震采集中取得了明显效果，显著地提高了资料的分辨率，解决了小砂体及内部的弱反射问题。

Seismic acquisition techniques of lithologic reservoirs in Jiyang depression

Lithologic reservoir of Jiyang depression is characterized by the weak seismic reflection in sand body and inter-bed and the low resolution of records.The resolution is improved through optimal combination of bin attributes which are small offset,small bin,wide azimuth,large off-inline distance and high coverage.Then the "feature net" of near surface conditions was created,and the "sudden transition" of near surface variations was found to provide reliable foundation for optimum shooting parameters selection.The effective methods of spectrum analysis were generalized.It is concluded that the target is satisfying sand body interpretation,not pursuing high frequency.By all of the techniques and methods above,remarkable effect in the seismic acquirement of lithologic reservoirs was obtained from the G7 field in Jiyang depression,the resolution of data was improved remarkably,and the problems of weak reflection in small sand body were solved.