非纵地震及其在低渗透油藏开发中的应用

Broadside Seismic Exploration and Its Application in Low-permeability Reservoir Development

非纵地震是针对地表条件复杂、地下地层水平及低勘探成本地区的一种地震勘探方法,它借鉴三维地震勘探宽方位观测、多方向采集的优点,接收点线平行偏离激发点线,较好地避开了井口及地表层间产生的强次生干扰。从非纵地震时距曲线方程的推导出发,介绍了非纵地震的勘探原理,通过与二维及三维地震勘探方法比较,说明了非纵地震的特点,并详细阐述了非纵地震的适用条件及其能解决的地质问题,非纵地震可以提高复杂地表地区地震资料的品质,可以解决构造、古地貌刻画、储层预测及含油气性检测等问题。最后通过非纵地震在鄂尔多斯盆地的应用,证明了该技术在低渗透油藏开发中的应用效果较好。

Broadside seismic exploration was a new method for the area of complex surface condition,horizontal layer and low exploration cost.It had the characteristics of broadside observation and multi-directional acquisition,its receiving was parallelly deviated from excitation line,which could keep away the strong secondary inference induced from wellhead and surface strata.Based on the derivation of time-distance curve of the broadside seism,the principle of broadside seismic exploration was introduced,and by comparison with 2Dand 3Dseismic explorations,the characteristics of broadside seismic exploration as well as the application conditions and geologic problems that solved by broadside seismic exploration were described.The method of broadside seismic exploration could be used to improve the seismic quality of complex near surface and solve the problems of structure,palaeogeomorphologic scratching,reservoir prediction and detection of oil-bearing zones.The method of broadside seismic exploration is used in Ordos Basin,it demonstrates that the technique can be used for low-permeability reservoir development and better effect is obtained in application.