地震资料相对保真处理方法研究

Relative amplitude preservation method for seismic data processing

（1．中国石油勘探开发研究院西北分院，甘肃兰州730020；2.中国石油天然气股份有限公司勘探与生产分公司，北京100007；3.中国石油天然气股份公司新疆油田分公司，新疆克拉玛依834000；4.CNPC东方地球物理公司，河北涿州072751）

Northwest Geophysical Institute,Petrochina,Lanzhou 730020,China

在岩性油气藏勘探中，为了能有效识别岩性油气藏，通常要求对地震资料做提高分辨率处理，但过分强调高分辨率和高信噪比会使处理结果的保真度变差。为此，基于准噶尔盆地石东地区一条长8km的高分辨率数据采集试验测线，通过分析剖面的反射特征和频谱特征，对高分辨率高信噪比处理中存在的问题进行了细致的分析和讨论，认为剖面中出现的薄层反射信息是一种假象。然后利用相对保真地震处理方法重新处理了同一条测线的地震资料，并与高分辨率高信噪比方法的处理结果进行了对比分析和讨论。最后利用两种方法解释的砂体模式建立了正演模型，模拟结果验证了相对保真处理的可信度，并证实了高分辨率高信噪比处理结果中出现的薄层信息不可靠。

In lithologic reservoir exploration,in order to effectively recognize lithologic reservoir,the resolution of seismic data is always required to be improved by processing,but putting undue stress on high resolution and high S/N make the fidelity of processing results worse.Therefore,based on an 8km high resolution testing line from Shidong area in Junggar Basin,through analyzing the reflection signatures and spectrum characteristics,the problems in high resolution and high S/N processing were deeply analyzed and discussed,and the results show that thinbed reflection information on seismic section is an artifact.Then,relative amplitude preservation processing method was used to re-process the seismic data from the same line,and the results were compared to that of the high resolution and high S/N processing method.Finally,the sandstone pattern interpreted by the two methods was used to establish forward model.The simulation results verified the credibility of relative amplitude-preservation processing,and the thin-bed information in high resolution and high S/N processing results unreliable.