| 沙漠区起伏地表地震波正演模拟与资料处理 |
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| 作者姓名： | 陈可洋 吴沛熹 张德新 杨微 |
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| 作者单位： | 1. 中国石油大庆油田有限责任公司勘探开发研究院, 黑龙江 大庆 163712;
2. 中国石油大庆油田有限责任公司 第六采油厂, 黑龙江 大庆 163114;
3. 中国石油大庆油田有限责任公司 第五采油厂, 黑龙江 大庆 163513 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目 (2009CB219307)资助 |
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| 摘 要： | 针对沙漠区的沙丘近地表条件,开展了起伏地表地震波正演模拟与资料处理分析.给出用于起伏地表的地震波正演模拟相关数值算法及关键参数.同时将随机孔洞介质用于刻画沙丘的松散地层结构,地表以上部分充填空气速度,并按沙漠区地震观测方式进行数据采集.以沙漠区实际地震资料为例,并结合理论模型进行地震数据处理和波场模拟分析.研究表明,沙漠区沙丘的松散结构是降低叠前道集和叠加剖面信噪比的主要原因,利用叠前时间偏移方法中加权绕射叠加功能可有效提高成像剖面和共反射点道集的信噪比,这对于沙漠区起伏地表实际地震资料处理具有一定的借鉴意义.
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| 关 键 词： | 沙漠地表 正演模拟 地震资料处理 信噪比 数据分析 |
| 收稿时间： | 2013-10-15 |
| 修稿时间： | 2014-03-17 |
Relief surface seismic wave forward simulation in desert area and data processing |
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| Authors: | CHEN Keyang WU Peixi ZHANG Dexin YANG Wei |
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| Institution: | 1. Research Institute of Petroleum Exploration & Development, Daqing Oilfield Company Ltd, PetroChina, Daqing 163712, Heilongjiang, China;
2. No.6 oil production company, Daqing Oilfield Company Ltd, PetroChina, Daqing 163114, Heilongjiang, China;
3. No.5 oil production company, Daqing Oilfield Company Ltd, PetroChina, Daqing 163513, Heilongjiang, China |
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| Abstract: | Considering the complex sand dune near-surface conditions in desert area,we carry out the forward simulation and data processing study. We present seismic wave numerical simulating algorithm and key parameters used for relief surface case. We introduce the random cave medium to depict the incompact sand dune structure,fill the practical air velocity above the surface,and simulate the seismic data acquisition in desert area. We take practical seismic data in desert area as example and use theoretical model to do the data processing and wave field analysis. The results show that the sand dunes' incompact structure in desert area is the main cause for the low S/N ratio in the pre-stack gather and stacking section. The pre-stack time migration method effectively improves the quality of the migration section and common reflection point gather by the weighted diffraction summation function,which provides certain significance for relief surface practical seismic data processing in desert area. |
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| Keywords: | desert surface forward simulation seismic data processing signal and noise ratio data analysis |
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