零相位反褶积在不整合接触关系保真处理中的应用

Zero-phase deconvolution applied in unconformity contact relation processing

在岩性油气藏勘探中,为了有效识别薄层反射信息,通常要求对地震资料做高分辨率处理。不同反褶积方法提取子波的方式不同,零相位子波能够更加准确地对应地层界面,分辨率最高。因此基于零相位子波的反褶积方法能够更好地保持地质体信息的真实性,从而达到真实刻画不整合面等地质体的目的。在准噶尔盆地腹部盆参2井东三维地震资料保真处理过程中,为了提高资料的分辨率,试验了不同反褶积方法,在刻画白垩系清水河组底界与下伏侏罗系的接触关系时得到两种不同的认识。通过分析地震沉积过程及测井资料,认为采用GeoEast系统中的零相位反褶积法得到的剖面结果所揭示的白垩系清水河组底界与下伏侏罗系呈剥蚀、顶超尖灭接触的关系更加真实、可信。

In the exploration of lithologic hydrocarbon reservoirs,we usually use seismic high-resolution processing to extract thin-bed reflection information.Different deconvolution methods have different ways of wavelet extraction.The zero-phase wavelet can show accurate stratigraphic interface with the highest resolution.Therefore,the deconvolution based on zero-phase wavelet can better preserve the authenticity of geological body information,and to achieve the purpose of real characterization of unconformity and other geological bodies.This paper demontrates an examplle of data processing for a 3 Dseismic in the East Well Pencan2 in the Junggar Basin.In order to improve the data resolution,different deconvolution methods are tested.In the identification of the contact between the bottom of Cretaceous Qingshui River formations and the lower Jurassic,we get two different imaging results.Based on seismic deposition process analysis and logging data validation,the contact relationship between the bottom of Cretaceous Qingshui River formations and the lower Jurassic is erosion,and pinchouts obtained with the zero phase-deconvolution provided by GeoEast System are reliable.