论文详情
雀莫错地区位于西藏羌塘盆地北羌塘坳陷带东部,综合分析认为该区基本具备陆源天然气水合物的形成条件,但受区域地层与构造环境等因素的影响,地震资料信噪比较低,传统的地震资料处理方法得到的地震剖面横向连续性不甚理想,影响了该地区天然气水合物构造、气源条件及冻土展布成藏体系的识别。为改善资料处理效果,将基于F-X预测滤波的基追踪算法应用于研究区的地震资料处理。介绍了基于F-X预测滤波的基追踪算法的基本原理以及处理流程;给出了研究区实际地震资料的处理结果并与传统的基追踪算法的处理结果进行了对比分析,结果表明其处理得到的反射系数剖面横向连续性好,为研究区后续厘清天然气水合物成藏关键因素、探测相关地球物理标志及圈定天然气水合物成矿远景区等提供了基础地震资料。
The Quemocuo area is located in the east of the North Qiangtang depression zone in the Qiangtang basin in Tibet.Comprehensive analysis shows that the basic formation conditions of natural gas hydrate occur in this area.However,because of regional stratigraphic and tectonic factors,the signal-to-noise ratio of the obtained seismic data is low,and there may be a lack of lateral coherence for the retrieved reflectivity profile,thus affecting the identification of a reservoir-forming system for natural gas hydrate.To obtain the desired results with enhanced lateral continuity,F-X prediction filtering was incorporated into the basis pursuit algorithm and applied to seismic data processing.Tests on synthetic and field data in the Quemocuo area showed more continuous reflectivity profiles,thus verifying the validity and feasibility of the proposed method.The proposed method provides technical support for clarifying the key factors of gas hydrate reservoir forming,detecting the relevant geophysical indicators,and delineating favorable areas.
中国地质调查局项目“青南藏北冻土区天然气水合物调查”(DD20160222)资助。