黄土塬区非纵连片地震资料叠前关键处理技术
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摘要
鄂尔多斯盆地西南部为黄土塬区,地表沟壑纵横,黄土巨厚,地震激发、接收条件差,地震资料信噪比低,只能用于构造解释。随着勘探程度的提高,需要对目标层位的岩性及含流体性做出准确预测,已有的地震勘探方法已不能满足实际需求,非纵地震勘探由此而生。非纵地震通过合适的非纵距,避开井口及地表层间产生的强次生干扰,能得到较高品质的原始地震资料。如何解决黄土塬区基础静校正和叠前去噪是该区资料处理的难点,在实际处理过程中运用非纵连片拟三维全息静校正技术和分频的区域振幅统计自适应异常振幅压制技术,较好地解决了黄土塬区某工区非纵测线的静校正及多种类型异常振幅两大难题。
The southwest of Ordos Basin was a loess plateau area folded by thick loess and whose structure was crossed gulley.The conditions of seismic excitation and reception for seismic data collection were poor.The signal-to-noise ratio of seismic data in the loess plateau area was low,so it could only be used for structural elucidation.With the development of exploratory degree,it was required to accurately predict the lithology and fluid of target strata,thus the current method of seismic exploration could not meet the actual demands,so broadside seismic exploration was developed.By designing suitable broadside offset,the broadside method could effectually avert strong secondary interference wave and collect original data of higher quality.In the loess plateau area,how to solve the problems of static calibration and de-noise of pre-stack data are difficult of data processing.In the process of broadside block-jointed seismic data,it effectually solves statics problem and various anomalous amplitude problems of broadside seismic data in loess plateau area in southwest Ordos Basin by applying the techniques of pseudo-three dimensional holography statics and self-adaptive anomalous amplitude suppression of regional amplitude statistics based on frequency division.
The southwest of Ordos Basin was a loess plateau area folded by thick loess and whose structure was crossed gulley.The conditions of seismic excitation and reception for seismic data collection were poor.The signal-to-noise ratio of seismic data in the loess plateau area was low,so it could only be used for structural elucidation.With the development of exploratory degree,it was required to accurately predict the lithology and fluid of target strata,thus the current method of seismic exploration could not meet the actual demands,so broadside seismic exploration was developed.By designing suitable broadside offset,the broadside method could effectually avert strong secondary interference wave and collect original data of higher quality.In the loess plateau area,how to solve the problems of static calibration and de-noise of pre-stack data are difficult of data processing.In the process of broadside block-jointed seismic data,it effectually solves statics problem and various anomalous amplitude problems of broadside seismic data in loess plateau area in southwest Ordos Basin by applying the techniques of pseudo-three dimensional holography statics and self-adaptive anomalous amplitude suppression of regional amplitude statistics based on frequency division.
引文
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[4]陶云光,袁刚,陈新安,等.二维地震连片相对保幅处理及储层预测技术在塔西南地区的应用[J].岩性油气藏,2007,19(1):97～100.
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